NEWS

MLT Release Notes
-----------------

Version 7.42.0

Framework
  - Added list-based image-conversion callback dispatch on mlt_frame.
    Use `mlt_frame_append_convert_image()` to register a converter instead of
    setting `frame->convert_image` directly. Multiple converters are tried in
    registration order; the first that succeeds wins. New public API:
    - `mlt_frame_prepend_convert_image()`
    - `mlt_frame_append_convert_image()`
    - `mlt_frame_convert_image()`
    - `mlt_frame_next_convert_image()`
    - `mlt_frame_has_convert_image()`
    - `mlt_frame_copy_convert_image()`
  - API behavior change: `mlt_frame_s::convert_image` is now read-only after
    init and is permanently set to the dispatcher `mlt_frame_convert_image()`.
    External code that set this field directly to a custom function will no
    longer have that function called. If you really need that (never heard of
    someone who does), clear the frame's "_convert_image_callbacks" property
    and use `mlt_frame_append_convert_image()` instead.

Modules
  - Image converters (`movit.convert`, `avcolor_space`, `imageconvert`) are
    now attached data-driven via `loader.ini` key `image_convert`.


Version 7.40.0

Framework
  - Some fixes for `win32_fopen()`.
  - Security fixes for time formatting in `mlt_properties`.
  - Security fix to disable deprecated `ante` & `post` properties in `mlc_consumer`.  
  - Added more properties to `metaschema.yaml` (new version 7.2):
    - `audio_formats`
    - `video_formats`
    - `layout-hint`
    - `hide-label`
    - `normalized_default`

Modules
  - Added `audio_formats` and `image_formats` properties to all service metadata.
  - Many improvements to the `openfx` module:
    - fixed potential overflows in `snprintf()` calls
    - multi-threading: frame- and slice-based
    - many compatibility fixes
    - added support for 2D and 3D numeric parameters (uses `mlt_rect`)
    - fixed preview scaling
    - fixed the default for `choice` (`values` in `metaschema.yaml`) parameters
    - fixed some effects rendering upside-down.
  - Fixed a signed int overflow in `pgm` producer.
  - Visual quality improvements for animations in the `qtblend` filter and transition.
  - MSVC compatibility fixes for `kdenlivetitle` producer and `frei0r`, `plusgpl`, `jackrack`, `openfx`, `rtaudio`, & `resample` modules.
  - Fixed choppy playback and deadlocks in the `decklink` consumer.
  - Updated `spatialaudio` module to the libspatialaudio 0.4.0 API.
  - Fixed libopus audio encoder warning about `frame_duration` in `avformat` consumer.
  - Fixed crash in `avformat` consumer with unsupported `attached_pic` format.
  - Added HDR10 SMPTE ST 2084 (PQ) properties to the `decklink` consumer:
    - `hdr_red_x`
    - `hdr_red_y`
    - `hdr_green_x`
    - `hdr_green_y`
    - `hdr_blue_x`
    - `hdr_blue_y`
    - `hdr_white_x`
    - `hdr_white_y`
    - `hdr_max_luminance`
    - `hdr_min_luminance`
    - `hdr_max_cll`
    - `hdr_max_fall`
  - Added `rnnoise` module for background audio noise reduction (depends on librnnoise).
  - Fixed plugin bundles for `vst2` filters on macOS.
  - Fixed the frame position in the `consumer` producer.
  - Hardened string formatting for metadata properties in the `vorbis` producer.
  - Fixed `typewriter` in `qtext` filter lags when rate properties changed.
  - Added the `.lot` file name extension for the `loader` producer to use `glaxnimate`.

Other
  - Skip Qt preflight for XML-only consumers in `melt`.


Version 7.38.0

Framework
  - Added dynamic hash table for `mlt_properties` for better performance.
  - Fixed memory corruption in `mlt_pool`.
  - Added warning on file open failure when parsing in `mlt_properties`. 

Modules
  - Added `hwaccel_scale` filter with preview scaling (scale_vaapi, scale_vulkan, scale_d3d11, scale_vt (macOS)).
    This adds an environment variable `MLT_AVFORMAT_HWACCEL_PPS` to provide a
    limiter to hwaccel because transfering uncompressed video between memory
    CPU and GPU memory is heavy.
    PPS = maximum pixels per second. Anything over it skips hwaccel. 
  - Added *basic* support for **OpenFX** *filter* plugins.
    OpenFX has many features. This is a summary of what is NOT yet included:
    - GPU rendering
    - exotic parameter types: Integer2D, Integer3D, Double3D, Custom, Bytes, Page, PushButton
    - plugin-driven keyframe animation; but MLT-driven does work
    - tile-, slice-, or frame-based multi-threading (only plugin internal threading)
    - multi-resolution
    - temporal clip access
    - overlays & dialogs
    - timeline queries (e.g. `getTime()`)
    - generator, transition, retimer
    - parametric curves
  - Added `lut` parameter to `avformat` producer.
  - Added `attached_pic` property to `avformat` consumer.
  - Added `movit.overlay_blend` video filter.
  - Added `compositing` property to `movit.overlay` transition.
  - Added constant-power crossfade to `mix` audio transition.
  - Added rounded corner support for `rect` in `kdenlivetitle`.
  - Added typewriter properties to `subtitle` filter.
  - Added underline and strikethrough to the `text` and `qtext` filters.
  - Changed `qtext` `style` property to support family named styles.
  - Added anchor point support for arbitrary rotations in `qtblend`.
  - Allow relative paths for images in `kdenlivetitle`.
  - Updated Glaxnimate module to version 0.6.0.
  - Switched to `QImage` scaling when downscaling in `qtblend`.
  - Deprecated `obscure` and `watermark` filters.
  - Install the jackrack module's blacklist files.
  - Fixed subtitle stream type metadata.
  - Fixed mutex initialization in `avformat` no-validate mode.
  - Fixed crash when using `linearblend` deinterlacer.
  - Fixed black bar with HEVC hwaccel decode and scale on Windows.
  - Fixed crash with hardware scaler and interlaced video.
  - Fixed converting 8-bit full to limited range with hwaccel.
  - Fixed alpha in 12-bit ProRes with alpha.
  - Fixed `movit` linear color not matching CPU filters.
  - Fixed `multi` consumer making extra linear color conversions.
  - Fixed regression writing raw FLAC.
  - Fixed `qtblend` filter returning unexpectedly large frames.
  - Fixed `qtext` outline encroaching on fill color.
  - Fixed wrong last+ frame when `eof=loop` in Glaxnimate.
  - Fixed `brightness` filter on track below a clip with transparency.

Other
  - Fixed crash during exit cleanup in `melt`.
  - Continued build improvements for MSVC.
  - A lot of metadata fixes and improvements.
  - Many fixes to API documentation.
  - Added C++ and Python to the API docs.
  - Added two 10-bit VP9 encoding presets. 


Version 7.36.1
  - Fixed construcing a new producer with a null profile.
  - Fixed constructing a `xml-clip` profile.


Version 7.36.0

Framework
  - Added `mlt_image_default_colorspace()`
  - Added `mlt_image_default_trc()`
  - Added `mlt_image_default_primaries()`
  - Added `mlt_color_convert_trc()`
  - Added the `mlt_consumer` property `mlt_color_trc` to drive a new
    `color_transform` normalizer filter. This sets the color transfer
    function to use for image/video effects. It is beneficial and
    correct to use linear color for any pixel mixing whether for blending
    or interpolation.
  - Removed `atexit(mlt_factory_close)` in `mlt_factory_init()`. Close the
    factory yourself if you feel the need to (not generally needed when
    exiting a process).
  - Prevent possible crash in `mlt_service_connect_producer()`.
  - Added `mlt_profile_is_valid()` and `Mlt::Profile::is_valid()`.
  - Fixed crash on invalid profile (CVE-2025-65834) in:
    * `mlt_consumer_start()`
    * `mlt_factory_producer()`
    * `xml` producer

Modules
  - Drop support for Qt 5.
  - Fixed bad color in `luma` transition's dissolve (regression in v7.34.0).
  - Fixed HLG HDR broken in `decklink` consumer (regression in v7.34.0).
  - Fixed warnings when flushing audio in the `avformat` consumer.
  - Added support for `hwaccel=vulkan` to the `avformat` producer.
  - Added a `color_transform` normalizer filter to the core module to convert
    all image/video producers to and from linear color. It is abstract in the
    core module and drives the following filters:
    * `avfilter.zscale`
    * `sws_colortransform`
    * `avfilter.scale`
  - Added filter `sws_colortransform` that is more efficient than `avfilter.swscale`
    but requires FFmpeg 8.
  - Changed the default property values of the `null` consumer:
    * `real_time`:  -1
    * `terminate_on_pause`: 1
  - Changed the `luma` and `movit.luma` transitions to progress linearly with
    linear `color_trc`.
  - Fixed the alpha channel dropped by the `xml-clip` producer.
  - Added `mlt_image_rgba64` format to:
    * `avcolor_space` filter
    * `avdeinterlace` filter
    * `affine` filter and transition
    * `audiolevelgraph` filter
    * `audiospectrum` filter
    * `audiowaveform` filter
    * `autofade` filter
    * `avformat` producer and consumers
    * `box_blur` filter
    * `brightness` filter
    * `pillar_echo` filter
    * `color` producer
    * `dropshadow` filter
    * `dynamictext` filter (when used with `qtext`)
    * `frei0r.alpha0ps` filter
    * `frei0r.alphagrad` filter
    * `frei0r.alphaspot` filter
    * `frei0r.bluescreen0r` filter
    * `frei0r.select0r` filter
    * `frei0r.transparency` filter
    * `gpsgraphic` filter
    * `gpstext` filter
    * `gradientmap` filter
    * `hslprimaries` filter
    * `hslrange` filter
    * `kdenlivetitle` producer
    * `lift_gamma_gain` filter
    * `lightshow` filter
    * `mask_apply` (when used with `qtblend`)
    * `movit.convert` filter
    * `outline` filter
    * `qtblend` filter and transition
    * `qtcrop` filter
    * `qtext` producer
    * `shape` filter
    * `spot_remover` filter
    * `strobe` filter
    * `subtitle` filter (when used with `qtext`)
    * `swscale` filter
    * `text` filter (when used with `qtext`)
    * `timeremap` link
    * `timer` filter (when used with `qtext`)
    * `vqm` transition
  - Changed the `mask_apply` filter default transition to `qtblend`.
  - Removed the maximum for the `alpha` property on the `brightness` filter
    so that you can _increase_ the opacity of an existing alpha channel.
  - Fixed background image scaling in the `gpsgraphic` filter.
  - Fix audio artifacts with pcm_s24le in mkv in `avformat` producer.

Other
  - Removed bitrate and quality limits in the vp9 and webm `avformat` presets.
  - Fixed melt on Windows not reading file path/name with extended characters
    (regression in v7.34.0).
  - Fixed building the ruby bindings with Ruby 3.0.
  - More fixes for MSVC.
  - Removed `win32/strptime.c` and replaced with Qt functions.
  - Stop showing `melt` usage on error exit.


Version 7.34.1

  - Fixed compiling with Qt 5.


Version 7.34.0

Framework
  - Added `mlt_image_rgba64` format. This change touched core, avformat, and qt modules as well.
  - Added `mlt_color_trc`, `mlt_color_primaries`, and more `mlt_colorspace`s along with functions:
    * `mlt_image_color_trc_name`
    * `mlt_image_color_trc_id`
    * `mlt_image_colorspace_name`
    * `mlt_image_colorspace_id`
    * `mlt_image_color_pri_name`
    * `mlt_image_color_pri_id`
  - Fixed some minor memory leaks with `cppcheck`.

Modules
  - Added rgba and rgba64 formats to the `luma` transition.
  - Added rgba64 format to `affine` filter and transition.
  - Added rgba64 format to the `qtblend` transition.
  - Added support for FFmpeg 8 to the `avformat` module.
  - Fixed audio `panner` filter for 5.1 channel layout.
  - Fixed converting 10-bit full to limited range in `avformat` producer (regression in v7.30.0).
  - Fixed shadow not working for multi-line template titles in `kdenlivetitle` producer.
  - Fixed `mask_apply` filter with custom transition.
  - Added `input_chmask` & `output_chmask` properties to `mono` filter.
  - Added `channel_mask` property to LADSPA/LV2/VST2 filters.
  - Added `channel_mask` to the `volume` filter.
  - Added an `outline` video filter.
  - Fixed a deadlock on image with a `%` in the name in `qimage` producer.
  - Added scrubbing to the `decklink` consumer.
  - Fixed `&` not decoded to `&` in the `xml` producer.
  - Fixed converting BT.709 to BT.2020 in the `avformat` module.
  - Fixed building a `ladspa` module without JACK as dependency.
  - Deprecate a JACK Rack XML file in the `jackrack` and `ladspa` modules.
  - Added filter `qtblend_mode`.
  - Fixed incorrect alpha channel breaking optimization of `qtblend`.
  - Fixed pixel format gbrap (Ut Video with alpha channel) in the `avformat` producer.
  - Fixed `opencv_tracker` filter on cut playlist clips.
  - Fixed warning about missing color range for `avfilter`s that use it (e.g. `avfilter.colorspace`).
  - Added typewriter properties to the `qtext` filter.
  - Fixed color distortion or a crash if using hwaccel with orientation rotation in `avformat` producer.

Other
  - Enable Qt 6 and disable Qt 5 modules in CMake by default.
  - Disable the SDL1 module in CMake by default.
  - Changed `melt` now exits with 1 if the producer is invalid.
  - Various changes to work with MSVC compiler.
  - Changed SVT-AV1 encode presets to VBR for Opus audio.
  - Fixed initializing Qt on the main thread in `melt`.
  - Documented the `-progress2` option for `melt`.
  - Increased the minimum C++ version to C++20.
  - Converted many modules to use CMake `find_package()`.
  - Added `libgen.c` and `libgen.h` for MSVC.


Version 7.32.0

Framework
  * Added `mlt_service_set_consumer()` and `Mlt::Service::set_consumer().
  * Optimized `mlt_multitrack` to not request a frame from a producer that is
    both hidden and muted.

Modules
  * Fixed pixel format for VP8/VP9 streams in `avformat` producer.
  * Fixed `yuva422p` pixel format in `avformat` producer.
  * Added `MLT_AVFORMAT_HWACCEL` & `MLT_AVFORMAT_HWACCEL_DEVICE` environment
    variables to `avformat` producer.
  * Updated `decklink` module for recent hardware and drivers.
  * Added `colorspace` and `color_trc` (including HDR) properties to the
    `decklink` consumer.
  * Fixed silencing extra audio channel (e.g. 6 => 8) in `decklink` consumer.
  * Fixed 5.1 C/LFE channels swapped over HDMI in `decklink` consumer.
  * Fixed text outline had sharp angles in `kdenlivetitle` producer.
  * Fixed default gamma to be Rec. 709 for 10-bit Y'CbCr from `movit` module.
  * Added support for HLG gamma to `movit` module (requires ddennedy/movit fork).
  * Fixed `opencv_tracker` filter should require multiple keyframes to be ready.
  * Fixed OpenCV crash on `rect` <= 1 pixel in `opencv_tracker` filter.
  * Fixed aspect ratio in `qtblend` filter and transition.
  * Fixed `QT_QPA_PLATFORM=offscreen` not working in qt and glaxnimate modules.
  * Improved preview scaling in `qtblend` filter.
  * Fixed requesting huge images on multiple `qtblend` filters or transitions.
  * Fixed `sdl2` consumer on macOS.
  * Fixed the `strobe` filter not working with `movit`.
  * Fixed color and gamma using `timeremap` link with `movit`.
  * Fixed consumer properties (e.g. `channels`) missing on `qglsl` consumer
    injected by the `xml` producer.


Version 7.30.0

Framework
  * Fixed `Mlt::Producer::set_creation_time()` not exported on i686.
  * Fixed `Mlt::Properties::set(int64_t)` symbol version.
  * Fixed `mlt_factory_init()` on Linux/BSD may fail to initialize when
    compiled with `-DRELOCATABLE`.
  * Added generic non-drop-frame timecode in `mlt_property.c`.
    Previously, it was only done for 30000/1001 and 60000/1001 frame rates,
    but 24000/1001 is especially important as well.
  * Added support for MLT XML embedded in chains.
    This, along with `xml-clip` producer handles mismatching frame rate
    between parent and child producers and facilites time-affecting links on
    the child.
  * Added `mlt_image_full_range(const char *color_range)` where any of the
    following strings return true (1): `full`, `jpeg`, `pc`.

Modules
  * Added `xml-clip` producer.
  * Fixed link `in` and `out` properties arenot serialized in the `xml` consumer.
  * Added `hslprimaries` and `hslrange` filters to the `plus` module.
  * Added a `gradientmap` filter to the `plus` module.
  * Fixed `avfilter` audio filters with FFmpeg 7.
  * Fixed incorrect frame rate for AVCHD (and possibly others) in `avformat`.
  * Fixed `window_id` property in consumer `sdl2` by using
    `SDL_CreateWindowFrom()`, especially important for embedding in GTK+ or Qt.
  * Fixed text not rendering in transition `vqm` since Qt 6.
  * Added `decimals` keyword to `gpstext` filter and move `RAW` keyword check.
  * Fixed `time_offset` property handling in `gpstext` filter.
  * Fixed reading and writing SRT files with unicode in the path.
  * Fixed `subtitle_feed` filter on producers with an in point > 0.
  * Fixed opaque alpha channels become translucent in `luma` transition.
  * Fixed a crash in the `mix` transition with `consumer` producer.
  * Fixed `freeze` filter freezing too much.
  * Fixed `avfilter.fillborders` with preview scaling.
  * Fixed non-proportional scaling in `qtblend` transition and filter.
  * Fixed `avfilter` color distortion with `mlt_image_rgb` and `mlt_image_rgba`.
  * Extended support for `colorspace=2020` consumer propeerty and the BT.2020
    colorspace in the `avformat` producer and consumer.
    This does not imply HDR, which is signaled through a `color_trc` property.
  * Added support for `mlt_image_yuv420p10`, `mlt_image_yuv444p10`, and
    `mlt_image_yuv422p16` in `avfilter`, `swscale`, and `rescale` filters.
    This facilitates using these pixel formats end-to-end when using only
    FFmpeg producers, certain avfilters, and `avformat` consumer.
    This means it is possible to do 10-bit end-to-end on the CPU when being
    careful to select compatible components and options to avoid conversions.
    One can pass-through HDR; however, you must set the `color_trc` and
    `pix_fmt` properties on the `avformat` consumer (see `ffmpeg -h full` for
    these values). The `avformat` consumer automatically converts MLT
    `colorspace` (integer value) to FFmpeg's `colorspace` and `color_primaries`
    (unless explicit) options.

Other
  * Cleaned up the examples in `src/swig`.
  * Changed the `x264-medium` preset to a higher quality.


Version 7.28.0

This fixes a couple of major regressions in the previous version 7.26.0:
  * Fixed seeking and frozen video due by reverting "Improved performance with
    intra-only video and reducing the frame rate."
  * Fixed using `melt` to render MLT XML with OpenGL effects from `movit`.

Other fixes and changes:
  * Deprecated the `composite` transition and the `sdl` and `ndi` modules.
  * Fixed Android camera video has the wrong frame rate (broken in v7.26.0).
  * Fixed audio not playing for audio-only DTS WMA.
  * Fixed using "https:" URLs in the `xml` producer.
  * Fixed crash on exit when running `melt -query` or `melt -query links`.
  * Added a `transition` property to the `watermark` filter. Now, it defaults
    to using `affine`.
  * Changed `affine` transition argument to set `rect` property if supplied.


Version 7.26.0

Framework
  * Fixed a double-free crash in `Mlt::Service::profile()`.

Modules
  * Fixes and improvements to the `avformat` producer:
    - Changed to prefer `r_frame_rate` over `avg_frame_rate`.
    - Fixed `lowres` if set too high.
    - Fixed `audio_index=all`.
    - Fixed `variable_frame_rate` incorrectly set true on 59.94 fps in Matroska.
    - Improved performance with intra-only video and reducing the frame rate.
    - Fixed mono audio handling regression on FFmpeg 7.
    - Fixed audio samples may be dropped unexpectly esp. with uncompressed.
  * Fixed `movit` transitions with a non-movit filter on one of its inputs.
  * Fixed duration in the `glaxnimate` producer off by one frame.
  * Added `dropshadow` filter to the `qt` module.
  * Fixed resetting animation in `kdenlivetitle` producer.
  * Added support for LV2 and VST2 plugins in the `jackrack` module.
  * Fixed crash using `av.declick` audio filter on FFmpeg 7.
  * Added `subtitle` filter and producer and `subtitle_feed` filter to the `plus` module.
  * Added subtitle encoding to the `avformat` consumer (new properties beginning with "subtitle.").
  * Fixed `alang` in the the `avformat` consumer.
  * Added `#gps_power` keyword to the `gpstext` filter.
  * Fixed tab handling in the `kdenlivetitle` producer.

Other
  * Added 8- and 10-bit encode presets for SVT-AV1.
  * Fixed building on OpenBSD.
  * Fixed building on musl libc.
  * Fixed consumer properties not updating the automatic profile on the `melt` command line.
  * Added `-loglevel` command line option to `melt`.


Version 7.24.0

Framework
  * Fixed a small memory leak in `mlt_repository`.
  * Fixed a small memory leak in `MltPushConsumer` C++ class.
  * Block connecting a null producer to a service.
  * Include `locale.h` on any GNU libc platform.

Modules
  * Added a new `spatialaudio` module with filters:
    - `ambisonic-decoder`
    - `ambisonic-encoder`
  * Fixed building with FFmpeg 7.
  * Fixed text keywords do not work with non-ASCII filenames on Windows:
    - `pixbuf` producer
    - `opencv_tracker` filter
    - `dynamictext` filter
    - `qimage` producer
  * Added "meta.media.aspect_ratio" property to the `avformat` producer.
  * Fixed `distort` property not working in `movit.rect` filter.
  * Fixed frames dropping or repeating in the `multi` consumer.
  * Fixed the `dynamic_loudness` filter maximizing audio gain.
  * Fixed distortion in the `mono` filter.
  * Also check for `WAYLAND_DISPLAY` to detect a graphical session in the `qt`
    and `glaxnimate` modules.
  * Fixed the `wave` filter distorts if `wave` = 1 with preview scaling.
  * Added the read-only `meta.media.%u.codec.layout` property to `avformat` producer.
  * Set the `channel_layout` property on the frame for the `noise` and `tone`
    audio producers.
  * Fixed `outline` maximum for the `text` and `dynamictext` filters.

Other
  * Fixed crash when using `-chain` from `melt`.
  * Fixed a small memory leak on Windows `fopen()`.


Version 7.22.0

Framework
  * Added new functions:
    - `mlt_property_is_color()`
    - `mlt_property_is_numeric()`
    - `mlt_property_is_rect()`
  * Many new keyframe types:
    - `mlt_keyframe_smooth_loose` - `~=` (same as old `mlt_keyframe_smooth` - Unity Catmull-Rom spline)
    - `mlt_keyframe_smooth_natural` - `$=` (Centripetal Catmull-Rom spline with natural slope)
    - `mlt_keyframe_smooth_tight` - `-=` (Centripetal Catmull-Rom spline with 0 slope)
    - `mlt_keyframe_sinusoidal_in` - `a=`
    - `mlt_keyframe_sinusoidal_out` - `b=`
    - `mlt_keyframe_sinusoidal_in_out` - `c=`
    - `mlt_keyframe_quadratic_in` - `d=`
    - `mlt_keyframe_quadratic_out` - `e=`
    - `mlt_keyframe_quadratic_in_out` - `f=`
    - `mlt_keyframe_cubic_in` - `g=`
    - `mlt_keyframe_cubic_out` - `h=`
    - `mlt_keyframe_cubic_in_out` - `i=`
    - `mlt_keyframe_quartic_in` - `j=`
    - `mlt_keyframe_quartic_out` - `k=`
    - `mlt_keyframe_quartic_in_out` - `l=`
    - `mlt_keyframe_quintic_in` - `m=`
    - `mlt_keyframe_quintic_out` - `n=`
    - `mlt_keyframe_quintic_in_out` - `o=`
    - `mlt_keyframe_exponential_in` - `p=`
    - `mlt_keyframe_exponential_out` - `q=`
    - `mlt_keyframe_exponential_in_out` - `r=`
    - `mlt_keyframe_circular_in` - `s=`
    - `mlt_keyframe_circular_out` - `t=`
    - `mlt_keyframe_circular_in_out` - `u=`
    - `mlt_keyframe_back_in` - `v=`
    - `mlt_keyframe_back_out` - `w=`
    - `mlt_keyframe_back_in_out` - `x=`
    - `mlt_keyframe_elastic_in` - `y=`
    - `mlt_keyframe_elastic_out` - `z=`
    - `mlt_keyframe_elastic_in_out` - `A=`
    - `mlt_keyframe_bounce_in` - `B=`
    - `mlt_keyframe_bounce_out` - `C=`
    - `mlt_keyframe_bounce_in_out` - `D=`
  * Fixed missing support for `mlt_service_transition` in `Mlt::Producer()` C++
    constructor.

Modules
  * Fixed `rotoscoping` filter crash on image with height = 0.
  * Fixed crashed due to `qtblend` transition requesting an image of 0 width or
    height.
  * Added support for RtAudio 6 in the `rtaudio` consumer.
  * Fixed `createdate` keyword deletes preceeding text in `dynamictext` filter.
  * Added `opacity` property to filters that use `qtext`:
    - `dynamictext`
    - `gpstext`
    - `qtext`
    - `timer`
  * Added `fade_video`, `fade_audio`, and `fade_color` properties to `autofade`
    filter.
  * Added backwards compatibility for changed filter names in frei0r v2.3.1:
    - `frei0r.measure_pr0be`
    - `frei0r.measure_pr0file`
    - `frei0r.tehroxx0r`
    - `frei0r.alpha0ps_alpha0ps`
    - `frei0r.alpha0ps_alphagrad`
    - `frei0r.alpha0ps_alphaspot`
    - `frei0r.denoise_hqdn3d`
  * Fixed a memory leak in `avformat` producer with consumer deinterlacer=yadif.
  * Fixed `qimage` producer color if consumer color_range=pc pix_fmt=yuv444p.

Other
  * Fixed `ten_bit/ProRes 422` avformat preset produced ProRes 444.
  * Fixed `YouTube` avformat preset did not output high profile with some
    hardware encoders.


Version 7.20.0

Framework

  * Fixed "blank" in a playlist does not have audio normalization filters.
  * Fixed serializing `mlt_color` transparent black as "#00000000" when
    the property was set using an integer or `mlt_color`.
  * Fixed `mlt_chain_set_source()` would always fetch a frame from the producer
    even if it has "meta.media.frame_rate_num" and "meta.media.frame_rate_den"
    properties making things slow.
  * Fixed `Mlt::Chain` leaking memory.

Modules

  * Added a `blank` producer to the `core` module.
  * Added keywords to `gpstext` filter:
    - `#gps_cadence#`
    - `#gps_grade_degrees#`
    - `#gps_grade_percentage#`
    - `#gps_temperature#`
  * Added some `color_style`s to the `gpsgraphic` filter:
    - 10 = color by speed (max 100 km/h)
    - 11 = color by grade (max 90 degrees)
    - 12 = color by grade (max 20 degrees)
  * Added more unit formats to `legend_unit` property of `gpsgraphic` filter:
    - `mmin` or `m/min`
    - `ftmin` or `ft/min`
  * Added keywords to `dynamictext` filter:
    - `#basename#`
    - `#filename#`
  * Fixed installing `filter_audioseam.yml`.
  * Added an `avlink` link to the `avformat` module for FFmpeg filters that can
    benefit from future frames such as `adeclick`.
  * Added the `preserve_alpha` property to the `box_blur` filter.
  * Fixed loading service metadata for the `qt6` and `glaxnimate-qt6` modules.
  * Fixed a crash when changing the `rotate` property in `avformat` producer
    with interlace video.
  * Add `astream` and `vstream` properties to avformat producer. Unlike
    `audio_index` and `video_index` are absolute indices across the entire
    array of streams regardless their type, these new 0-based properties are
    relative to the type audio or video. For example, astream=1 is the second
    audio stream.
  * Fixed a possible crash in the `avformat` producer's `mlt_producer_probe`
    virtual function.
  * Updated the `glaxnimate` module to version 0.5.4.
  * Fixed the `sdl2` consumer crashing with the Linux radeonsi_dri driver and
    showing only all black with the Linux `nvidia` driver.

Other

  * Fix compiling on Android (not supported by the core developers).
  * Changed the `avformat` consumer `FLAC` preset to use the `flac` format.
  * Fixed the `melt` <kbd>Shift+H</kbd> and <kbd>Shift+L</kbd> keyboard
    shortcuts when the SDL2 window has focus.


Version 7.18.0

Framework

  * Fixed `mlt_frame_get_audio` fails on `mlt_audio_none`.
  * Added `mlt_audio_free_data()`.
  * Added `meta.playlist.clip_position` and `meta.playlist.clip_length`
    properties to `mlt_playlist`.

Modules

  * Added two audio filters to core module to be used on a playlist/track:
    - `audioseam`
    - `autofade`
  * Fixed a crash in `vidstab` filter on image format change.
  * Fixed font weight in `qtext` filter on Qt 6.
  * Fixed yuv420p not working in `rescale` filter.
  * Fixed text shadow outline in `kdenlivetitle` producer.
  * Fixed crash when changing the profile with `count` producer.
  * Fixed constructor corruption in `frei0r` module.
  * Fixed `deinterlace` link was added to invalid producer in `xml` producer.
  * Fixed producers not indicating progressive scan video:
    - `kdenlivetitle`
    - `pango`
    - `qimage`
    - `qtext`
  * Fixed video scan mode detection in `avformat` producers that only indicate
    on their container format and not on frames such as Ut Video in Matroska.
  * Fixed very large images in `qimage` producer on Qt 6.
  * Fixed seeking on clips that use `speed_map` in `timeremap` link.
  * Fixed a color level problem with sRGB inputs in the `movit` module.
  * Fixed `avformat` producer's deallocation function for `AVCodecContext`.
  * Fixed field order of `qtblend` and `frei0r.cairoblend` transitions.
  * Changed the `avformat` producer `seek_threshold` default to 64.
  * Updated `ebur128` filter to version 1.2.6.


Version 7.16.0

Framework

  * Added a `chain_normalizers.ini` to the data directory.
  * Added New C functions to support deinterlacer links:
    - `mlt_deinterlacer_name()`
    - `mlt_deinterlacer_id()`
    - `mlt_link_filter_init()`
    - `mlt_link_filter_metadata()`
    - `mlt_cache_put_frame_audio()`
    - `mlt_cache_put_frame_image()`
    - `mlt_frame_clone_audio()`
    - `mlt_frame_clone_image()`
  * Added support for loading a filter as a link via `mlt_link_filter_init()`.
  * Added enum `mlt_deinterlacer` with:
    - `mlt_deinterlacer_none`
    - `mlt_deinterlacer_onefield`
    - `mlt_deinterlacer_linearblend`
    - `mlt_deinterlacer_weave`
    - `mlt_deinterlacer_bob`
    - `mlt_deinterlacer_greedy`
    - `mlt_deinterlacer_yadif_nospatial`
    - `mlt_deinterlacer_yadif`
    - `mlt_deinterlacer_bwdif`
    - `mlt_deinterlacer_estdif`
    - `mlt_deinterlacer_invalid`
  * Added new 10-bit YUV members to enum `mlt_image_format`:
    - `mlt_image_yuv420p10`
    - `mlt_image_yuv444p10`
  * Fixed a deadlock and improved quality of start of playback when
    `mlt_consumer` property `prefill` is greater than 1.
  * Fixed a couple of data races in `mlt_events` and `mlt_consumer`.
  * Fixed a crash in `mlt_frame_clone()` with movit and the `mask_start` filter.

Modules

  * Fixed regressions in version 7.14.0:
    - memory and thread count usage in `swresample` and `resample` links
    - automatic profile support in `melt`
    - crash in `count` producer
  * Upgraded the `glaxnimate` git submodule to version 0.5.3.
  * Added avformat/`avdeinterlace` (default) and xine/`deinterlace` links.
  * Fixed deinterlacing in the `multi` and `qglsl` consumers.
  * Added 10-bit video support to `movit.convert` filter.
  * Several things in the `avformat` producer:
    - Fixed artifacts decoding raw FLAC audio.
    - Fixed a potential crash on `mlt_producer_probe()`.
    - Fixed seeking on music with album art.
    - Fixed possible infinite loop on end-of-file.
    - Fixed a potential deadlock.
    - Fixed chroma bleeding on interlaced yuv420p.
    - Fixed `color_range` or `force_full_range` sometimes not working.
    - Fixed `autorotate` property not working with a chain.
    - Added audio caching.
    - Deprecated the `mute_on_pause` property.
  * Fixed FFmpeg version 6 compilation error.
  * Fixed rendering the text outline in `kdenlivetitle` producer.
  * Fixed `'movit.rect` property animation.
  * Fixed corrupt video in `crop` filter when `mlt_image_yuv420p` requested.
  * Fixed possible null pointer crashes in some audio filters:
    - `audiolevel`
    - `volume`
    - `loudness`
  * Fixed a possible roi assert crash in `opencv.tracker` filter.
  * Added support for "Nano" `algo` to the `opencv.tracker` filter.
  * Added the property `fix_background_alpha` to the `luma` transition.

Other

  * Added `-query links` to `melt` command line.
  * Added `avformat` consumer presets for 10-bit video:
    - AV1
    - DNxHR-HQ
    - FFV1
    - ProRes 422
    - ProRes 444
    - ProRes HQ
    - x264-high10
    - x265-main10
  * Added a `clang-format` target to CMake and reformatted all code.
  * Added warnings as errors with some exceptions to CMake with `Debug`
    build type and gcc.
  * Fixed numerous warnings throughout the code.


Version 7.14.0

Framework

  * Added functions to get detailed info about a producer more directly
    (without having to get a frame and get its image in the case of
    avformat producer, for example):
    - `mlt_producer_probe()`
    - `Mlt::Producer::probe()`
  * Added functions to add normalizer links to chains (based on a
    `chain_loader.ini` configuration data file:
    - `mlt_chain_attach_normalizers()`
    - `Mlt::Chain::attach_normalizers()`
  * Changed `locale_t` to `mlt_locale_t` to avoid redefinition on some systems
    (e.g. clang/llvm on win32).
  * Fixed the value provided with event "consumer-thread-join" to be
    `mlt_event_data_thread` as documented.
  * Fixed `mlt_image_format_planes()` for `mlt_image_yuv420p`.

Modules

  * Added a `swresample` link to the avformat module.
  * Added a `resample` link to the resample module.
  * Fixed compatibility of avformat module with FFmpeg version 6.
  * Fixed `rotoscoping` filter when request image size different than profile.
  * Fixed `timeremap` link breaking `crop` filter.
  * Fixed audio/video sync in `avformat` producer when the video start time is
    not 0.
  * Improved seeking on a WMA audio file in `avformat` producer.
  * Optimization to set `AVDISCARD_ALL` on disinterested streams in `avformat`
    producer.
  * Added separate demuxing thread in `avformat` producer.
  * Added `filtergraph` property to the `avformat` producer.
  * Fixed filter `movit.convert`'s CPU image converter in `mlt_tractor` and
    `mlt_frame_clone()`.
  * Fixed using `movit` module with mlt_chain.
  * Fixed 10-bit full range YUV color input with Movit.
  * Fixed the `movit.luma` transition.
  * Changed the `qglsl` consumer to use an OpenGL core profile version 3.2
    context to make it compatible with recent Movit versions.
  * Fixed aspect ratio issues in `qtblend` filter transform.
  * Upgraded `glaxnimate` git submodule to version 0.5.2.
  * Fixed `xml` producer incorrectly adds a path prefix to a `consumer`
    producer.
  * Fixed using `opencv.tracker` filter with `mlt_chain`.
  * Added interlace-aware chroma conversion from mlt_image_yuv422 to yuv420p
    in the `avformat` consumer.
  * Added the `speed_map` property to the `timeremap` link.
  * Fixed the `loader` producer not injecting the `consumer` producer when a
    `xml` producer changes the frame rate.
  * Fixed 'loader' producer corrupts the profile colorspace and description
    when it injects a `consumer` producer.
  * Added a `loader-nogl` producer to the core module based on `loader` but
    prevents adding `movit`-based filters.
  * Changed `count` producer to take an optional string argument with the name
    of a loader producer.
  * Fixed `yadif` deinterlace not working in a mlt_chain.
  * Fixed the bob, weave, greedy, onefield `deinterlace` filter methods on
    x86-64 architecture.

Other

  * Fixed SWIG python shadow functions for mlt7.
  * Added CMake build option `MOD_GLAXNIMATE_QT6`.


Version 7.12.0

This version is released soon after 7.10.0 to fix a couple of major new
bugs in the popular `qtblend` and `frei0r.cairoblend` transitions.
It also includes new color animation APIs with sensible interpolation!

Framework
  * Added new color animation APIs:
    - `mlt_property_set_color()`
    - `mlt_property_get_color()`
    - `mlt_property_anim_set_color()`
    - `mlt_property_anim_get_color()`
    - `mlt_properties_anim_set_color()`
    - `mlt_properties_anim_get_color()`
    - `Mlt::Properties::anim_get_color(char const*, int, int)`
    - `Mlt::Properties::anim_set(char const*, mlt_color, int, int, mlt_keyframe_type)`

Modules
  * Updated the following services to support animation of color properties:
    - `frei0r` (any color parameter in any frei0r plugin)
    - `chroma`
    - `chroma_hold`
    - `audiolevelgraph`
    - `audiospectrum`
    - `audiowaveform`
    - `gpsgraphic`
    - `gpstext`
    - `qtcrop`
    - `qtext`
  * Added `discontinuity_reset` property to `dynamic_loudness` filter.
  * Fixed `qtblend` transition not blending with an opaque rgba image.
  * Added support for the "finer" engine in Rubberband version 3.
  * Fixed crash in `frei0r.cairoblend` when `threads` property not set.

Other
  * Fixed leaking the xml producer in `melt` when the XML contains a `consumer`
    element but no profile information.
  * Fixed symbol not found error in `rtaudio` consumer.


Version 7.10.0

The highlight of this version is support for Qt 6.

Framework
  * Fixed some unguarded null pointers.
  * Added `MLT_REPOSITORY_DENY` environment variable to skip loading a module
    (colon delimited list of file names without extension, for example libmltqt).
  * Fixed frame corruption with one frame transition
  * Changed so-called test-card frame with audio to show a checkerboard:
    - Added `mlt_image_fill_checkerboard()`
    - Added `mlt_image_fill_white()`
  * Preserve the producer `creation_time` property when creating a chain.
  * Added `mlt_image_rgba_opaque()`.
  * Fixed getting a property as a timecode or clock value with 24 or 23.98 fps
    in `mlt_property.c`.

Modules
  * Added support for Qt 6:
    - Added `MOD_QT6` and `BUILD_TESTS_WITH_QT6` CMake options.
    - Allow installing building and installing both Qt 5 & 6 modules.
    - Avoid loading both Qt 5 & 6 modules by preferring Qt 5 (use
      MLT_REPOSITORY_DENY=libmltqt to block Qt 5 and use Qt 6).
    - This is limited to the `qt` module for now and not `glaxnimate` (still
      a work-in-progress).
  * Added support for WebP animation to `qimage` producer.
  * Added `gps_graphic` filter to the `qt` module.
  * Added the `format` property in each producer's get_frame method to indicate
    the producer's default/preferred mlt_image_format to facilitate
    an optimization in the `qtblend` transition when the B frame is opaque
    and has the same aspect ratio.
  * Added property animation to all audio visualization filters in the `qt` module.
  * Improved TGA format detection in `qimage` filter.
  * Fixed `qtblend` transition has incorrect scaling with consumer scaling.
  * Fixed an case of incorrect alpha scaling in `qtblend` transition.
  * Fixed `luma` transition not updated when `resource` property changes.
  * Added the `alpha_operation` property to the `shape` filter.
  * Updated the `glaxnimate` git submodule to version 0.5.1.
  * Fixed `lines` filter in `oldfilm` regression in v7.6.0.
  * Added `dbpeak` property to the `audiolevel` filter in dB.
  * Fixed memory leak using some frei0r plugins in conjunction with
    an `affine` that animates the `rect` property.

Other
  * Fixed building for musl.
  * Fixed underlinking iconv in `gdk` module on MinGW.
  * Fixed SWIG CMake options can overwrite each other.
  * Fixed SWIG 4 no longer generates a `mlt.php`.


Version 7.8.0

This highlight of this version is a new glaxnimate producer to render 2D
vector art and animation.

Framework
  * Added `mlt_frame_get_alpha_size()` and refactored code to use it.
  * Fixed a possible null pointer crash in `mlt_service_apply_filters()`.

Modules
  * Added a `glaxnimate` producer to the glaxnimate module.
  * Added new file extensions for `glaxnimate` producer: json, lottie, rawr, tgs.
  * Removed Qt4 compatibility from the qt module.
  * Added Qt6 compatibility to the qt module.
  * Added new file extensions for `qimage` producer: avif, heic, heif, jxl.
  * Fixed `color_range` when using the `multi` consumer.
  * Fixed reloading updated `results` in the `loudness` filter.
  * Fixed `image_mode=blend` in the `timeremap` link.
  * Fixed crash regression in `swscale` filter with odd size YUV image.
  * Fixed the `choppy` filter may result in black frames with transitions.
  * Prevent a crash in `avfilter` producer for a bug in glibc with `_FORTIFY_SOURCE=3`.


Version 7.6.0

This version adds image slice-threading to many filters and full support for
full range color. All inputs are normalized to and processed at
the range specified by the consumer property `color_range` that defaults to
tv/mpeg (limited).

Framework
  * Added `Mlt::Animation::next_key()` and `previous_key()` with error checking.
  * Fixed the `moduledir` and `mltdatadir` variables in the pkg-config file.
  * Removed calling `setlocale()` in `mlt_factory_init()` (moved to `melt`
    option `-setlocale`).
  * Added `mlt_properties_copy()` and `Mlt::Properties::copy()`.
  * Changed some primarily internal property names to consolidate on "consumer."
    as a prefix convention for all consumer properties copied to `mlt_frame`s.
  * Added consumer property `deinterlacer` to replace deprecated `deinterlace_method`.
  * Fixed full range color from producer to consumer.
  * Added `mlt_slices_size_slice()` helper function.
  * Fixed choppy playback due to large values in `frame_rate_num` or
    `frame_rate_den` in `mlt_consumer`.
  * Added performance optimization for a single slice in `mlt_slices`.

Modules
  * Added `audiolevelgraph` video filter to the `qt` module.
  * Added property `segment_gap` to the `audiospectrum` video filter.
  * Added `segments` property to the `audiolevelgraph` and `audiospectrum` filters.
  * Fixed loading image sequence with extended UTF-8 characters in the
    name of a folder for the `qimage` producer.
  * Fixed a crash in `avformat` producer if the `rotate` property is set after
    the first frame is fetched.
  * Added the `invert_mask` property to the `shape` video filter.
  * Changed `avformat` producer to normalize frame rates very close to
    non-integer broadcast frames 24/1.001, 30/1.001, and 60/1.001.
  * Converted the `chroma` and `chroma_hold` filters' `key` property to a proper
    color type.
  * Added slice threading to:
    - `avformat` producer (with FFmpeg v5)
    - `swsscale` (with FFmpeg v5)
    - `lift_gamma_gain`
    - `shape`
    - `charcoal`
    - `vignette`
    - `wave`
    - `threshold`
    - `tcolor`
    - `sepia`
    - `mirror`
    - `invert`
    - `grain`
    - `lines`
    - `spot_remover`
  * Improved the speed of the `oldfilm` filter.
  * Added a faster `box_blur` filter to the core module and deprecated the
    `boxblur` filter in the kdenlive module.
  * Fixed preview scaling for the `avfilter.gblur` filter.
  * Fixed incorrect text overlap in `kdenlivetitle` producer.
  * Improved audio synchronization in `avformat` when playing in reverse.
  * Added much more service metadata (documentation).
  * Fixed full range 10-bit video input in `avformat` producer.
  * Fixed full range color handling in:
    - `avformat` producer
    - `avcolor_space`
    - `brightness`
    - `resize`
    - `luma` transition
    - `movit.convert`
    - `charcoal`
    - `invert`
    - `shape`
  * Fixed identifying unsupported colorspaces in `avformat` producer.
  * Fixed preserving the alpha channel in the `avfilter.fspp` filter.

Other
  - Some CMake fixes.
  - Added `dumb-init` to the docker (no need to remember `docker run --init`).


Version 7.4.0

The main highlight of this version is property animation for avfilter!

Framework
  * Added more constructors and assignment operators in C++ wrapper:
    - `Mlt::Filter::Filter(Mlt::Filter*)`
    - `Mlt::Link::Link(Mlt::Link*)`
    - `Mlt::Link::Link(Mlt::Service&)`
    - `Mlt::Link::Link(Mlt::Link&)`
    - `Mlt::Link::Link(Mlt::Link const&)`
    - `Mlt::Link::operator=(Mlt::Link const&)`
    - `Mlt::Service::Service(Mlt::Service*)`
  * Fixed serialized animation in `mlt_animation_serialize_cut_tf()` and
    `mlt_animation_serialize_cut()` to include a trailing keyframe value.

Modules
  * Added property animation for `avfilter` filters.
    This only works for numeric parameters, but many libavfilter options that
    have a type string are actually numeric in nature but accept a string
    expression.
  * Added `rotate` property to `avformat` producer to override orientation.
  * Changed `jackrack` module to silence false LADSPA plugin loading errors.
  * Fixed a crash in the `oldfilm` filter when using preview scaling.
  * Fixed `timeremap` link distorts audio when speed is zero.
  * Added nautical mile and knot units of measure to the `gpstext` filter.
  * Fixed full range color handling with embedded tractor (e.g. same track
    transition).
  * Fixed device capture in `avformat` producer regression in version 7.2.0.
  * Fixed a crash in the `matte` transition.


Version 7.2.0

This is the first major maintenance release for the new major version 7
rendering it much more production ready. Plus there are a few nice new features.

Framework
  * Added support for `mlt_properties` as a child of `mlt_properties`
    including XML (de)serialization:
    - `mlt_property_set_properties()`
    - `mlt_property_get_properties()`
    - `mlt_properties_set_properties()`
    - `mlt_properties_get_properties()`
    - `mlt_properties_get_properties_at)(`
    - `Mlt::Properties::set()`
    - `Mlt::Properties::get_props()`
    - `Mlt::Properties::get_props_at()`
    Applications can use this to store structured data in its own namespace,
    for example "shotcut:markers". And modules could use this for hierarchical
    parameters.
  * Fixed crash in `mlt_transition` upon inserting or removing a track.
  * Stopped loading `mlt_profile` until needed in `mlt_chain` creation.

Modules
  * Added filter `gpstext` that is similar to `dynamictext` based on data in a
    GPX file.
  * Added speed parameter to `timer` filter.
  * Added WebP presets for `avformat` consumer.
  * Added a pixelate option to the `opencv_tracker` filter's `blur` property.
  * Fixed `center_bias` of `crop` filter not working with `use_profile`.
  * Fixed some missing RGB `mlt_image_format` renames after change in v7.0.0.
    This primarily affected presets and service metadata.
  * Fixed a crash when changing preview scaling in `timeremap` link.
  * Fixes problems due to adding redundant normalize filters upon loading a
    producer from XML.
  * Ensure filters added by the `loader` producer always come first in list.
  * Fixed a crash using `shape` and `affine` filters together on `color` producer.
  * Fixed a crash when a `vidstab` file fails to open.
  * Changed `vidstab` filter to save its file in ASCII text mode.
  * Fixed a clang LTO error in the `decklink` module.
  * Fixed a video decoding regression on some videos in the `avformat` producer.
  * Fixed a crash in the `audiowaveform` filter.
  * Fixed loading a relative filename from XML for `mask_start` with `shape`.
  * Fixed "#filedate#" in `dynamictext` filter when used with `timeremap` link.
  * Fixed `timer` filter's new `speed` property interaction with `start` delay.
  * Fixed a crash with YUYV422 (YUY2) input in `avformat` producer.
  * Fixed data race condition in `timeremap` link.
  * Fixed compiling `avformat` module with FFmpeg git beyond v4.4 with
    many deprecations removed.
  * Fixed alpha channel size calculation in `brightness` filter.
  * Restore legacy tracker and the new DaSiam tracker for OpenCV >= 4.5.3 in the
    `opencv_tracker` filter.
  * Fixed a crash in `opencv_tracker` on `shape_width` = 0.
  * Fixed incorrect handling of in and out points and duration in the
    `opencv_tracker` filter.
  * Fixed the `composite` transition leaking left border of an image on the
    right side on uneven width.
  * Fixed a problem handling some UTF-8 in thhe `typerwriter` filter.

Other
  * Added support for the `RELOCATABLE` CMake option for Linux or BSD build.


Version 7.0.1

This version is just build fixes for the most immediate problems with the
somewhat new but exclusive build system in v7.

* Fixed docker image not working.
* Fixed a system-installed build cannot finds its modules and data.
* Fixed the python installation path for binaries.
* Added support for the `DESTDIR` environment variable when creating melt symlink.
* Increased the build constant for the maximum size of a line of a properties file.
* Fixed the vid.stab metadata install path.


Version 7.0.0

This is a major new version that breaks API to add a major new feature to the
framework: retiming. This is accomplished through new classes `mlt_chain` and
`mlt_link`. And since we are breaking API we decided to clean house by
removing deprecations and switching the build system over entirely to CMake.
For more information see our
[migration guide](https://mltframework.org/docs/v7migration/).

Framework
  * Added `mlt_chain` and `Mlt::Chain` classes.
  * Added `mlt_link` and `Mlt::Link` classes.
  * Added a `link` value to service `type` in the service metadata schema.
  * Added a boolean `animation` parameter attribute to the service metadata schema.
  * Added `mlt_animation_shift_frame()` and `Mlt::Animation::shift_frames()`.
  * Added `mlt_animation_get_string()`.
  * Fixed using a stale cached property animation string.
  * Added `mlt_image` and `Mlt::Image` classes.
  * Remove legacy "height + 1" workaround in image allocation.
  * Fixed a crash on setting `timewarp` speed higher than 23x.
  * Added `mlt_audio_silence()`.
  * Removed `mlt_image_opengl`.
  * Replaced variadic arguments in `mlt_events` with new `mlt_event_data` APIs.
  * Removed `mlt_geometry` APIs.
  * Renamed `mlt_image_rgb24a` as `mlt_image_rgba`.
  * Renamed `mlt_image_rgb24` to `mlt_image_rgb`.
  * Renamed `mlt_image_glsl` to `mlt_image_movit`.
  * Renamed `mlt_image_glsl_texture` to `mlt_image_opengl_texture`.
  * Removed virtual function `mlt_frame::get_alpha_mask()`.
  * Removed `mlt_frame_get_alpha_mask()`.
  * Removed deprecated functions:
    - `mlt_sample_calculator`
    - `mlt_sample_calculator_to_now`
    - `mlt_channel_layout_name`
    - `mlt_channel_layout_id`
    - `mlt_channel_layout_channels`
    - `mlt_channel_layout_default`
    - `mlt_slices_init`
    - `mlt_slices_close`
    - `mlt_slices_run`
    - `mlt_playlist_move_region`
    - `Mlt::Playlist::move_region`
  * Fixed a rounding error calculating display aspect ratio in `mlt_profile_from_producer()`.

Modules
  * Added a `timeremap` link to the core module with animatable `map` property.
    (Speed can increase or decrease between keyframes including reverse.)
  * Added `chain` and `link` XML elements to `xml` module.
  * Added "meta.media.has_b_frames" property to `avformat` producer.
  * Removed deprecated modules:
    - `dv`
    - `gtk2` (not gdk)
    - `kino`
    - `linsys`
    - `lumas`
    - `motion_est`
    - `swfdec`
    - `videostab`
  * Removed the following services:
    - `data_feed` filter
    - `data_show` filter
    - `region` filter and transition
    - `sdl_image`
  * Converted filters to use new `mlt_image` class:
    - `brightness`
    - `imageconver`
    - `mirror`
    - `spot_remover`
  * Deprecated the `audiowave` filter.
  * Added the ability to build the `jackrack` module without JACK to get only
    LADSPA producers and filters.
  * Deprecated `start` and `end` properties for the following filters:
    - `brightness`
    - `panner`
    - `boxblur`
    - `wave`
    - `volume`
  * Removed deprecated `font` property from `pango` producer.
  * Improved album art (attached pic) detection in `avformat` producer.
  * Improved the `resample` filter to have less artifacts and use less memory.

Other
  * CMake: nearly complete rewrite.
  * Removed the old configure bash scripts and Makefiles.
  * Added `-chain` and `-link` options to `melt` command line.


Version 6.26.1

This version fixes a major regression in the avformat producer to read from
network URLs.


Version 6.26.0

This is the last planned release of major version 6. Version 7 will be released
soon and introduce some minor API breakage while removing deprecations.
The main new feature in this version is hardware-accellerated decoding!
However, this is a basic implementation: It always returns the uncompressed
video to the CPU memory with no pipelining to filters. Even when coupled with
hardware encoding in the avformat consumer it must transfer the video. Also,
there is no automatic software/CPU fallback and no resource management.

Modules
  * Added support for `hwaccel` query string parameter to the `avformat`
    producer. It accepts the following values:
    vaapi (Linux/BSD), cuda (Linux), videotoolbox (macOS), d3d11va (Windows), dxva2 (Windows)
  * Added support for `hwaccel_device` query string parameter to the `avformat`
    producer. This is only used with vaapi (device path) and cuda, d3d11va, or
    dxva (number).
  * Improved the usage of image slice threading in `frei0r`. This only applies
    when `threads`=0 and only works with some frei0r plugins that you must decide
    yourself.
  * Added an ellipse item to `kdenlivetitle` producer.
  * Added support for PNG and GIF as album art in the `avformat` producer.
  * Added BT.2020 color space metadata to the `avformat` producer.
  * Resolved many FFmpeg deprecations in the `avformat` producer making it possible to support AV1 decoding.
  * Added a `strobe` fitler that periodically makes the alpha channel transparent.
  * Added a new `typewriter` text filter (currently only works with the
    kdenlivetitle producer).
  * Improved sound quality for lower pitch shifts in `rbpitch`.
  * Fixed speed of trick play in the `jack`, `rtaudio`, `sdl_audio`, and `sdl2_audio` consumers.
  * Fixed matrix for independent channels in `swresample` filter.
  * Fixed leading zeros for the `timer` filter.
  * Fixed flickering using `affine` with a `luma` transition.
  * Fixed a crash using RGBA images in the `qimage` producer (regression in v6.22.0).
  * Fixed `brightness` filter misbehaves on `alpha` > 1.
  * Fixed writing `flac` format file does not set its duration in the `avformat` consumer.
  * Fixed an infinite loop in `rbpitch` filter.
  * Fixed `ttl` in the `qimage` producer.
  * Fixed building with OpenCV 4.5
  * Fixed artifacts with multiple HTML `qtext` filters and frame threading.
  * Deprecated the `start` and `end` properties on the following (use property
    animation instead):
    - brightness
    - panner
    - boxblur
    - wave
    - volume
  * Deprecated the following services:
    - data_show
    - region
    - transition filter
    - autotrack_rectangle
    - motion_est
    - slowmotion

Other
  * CMake:
    - Fixed building without SWIG.
    - Added many "MOD_..." options to explictly disable modules.
    - Added src/tests and the option `BUILD_TESTING`, which defaults off.
    - All dependency checks moved to top level CMakeLists.txt.
    - Install melt man page.
    - Install oldfilm SVG files.
    - Added src/examples.
    - Install framework/metaschema.yaml.
    - Fixed `plusgpl` datadir.
    - Added all swwig/ languages.
    - Increased C++ standard to C++14.
  * Added an `AV1` encoding preset.
  * Improved documentation of the requirement for C11.
  * The minimum version of FFmpeg is v4.0 and Libav is no longer supported.


Version 6.24.0

This version is mostly fixes plus a few new filters.

Framework
  * Trigger a `property-changed` event on `mlt_properties_pass_list`.
  * Fixed using a video transition with a video clip on an audio track.
  * Reduce the amount of service caching to 2X #tracks to reduce memory usage.

Modules
  * Added the `pillar_echo` filter to the plus module.
  * Added a `qtcrop` filter to the qt module.
  * Added `html`, `resource`, `overflow-y`, and `_hide` properties to the `qtext` filter for rich text.
  * Added the filter `choppy` to the core module.
  * Added slice threading to the `brightness` filter.
  * Fixed compiling with OpenCV 4.
  * Fixed the colors when using `mlt_image_format=rgb24a` with `avformat` consumer.
  * Fixed using WebVfx in a Docker container.
  * Fixed a possible crash in the `timewarp` producer on sources with non-integer frame rates.
  * Fixed a regression in version 6.22 with multiple affine filters at the same time.
  * Fixed possible abort or deadlock on recursive pthread mutexes in `avformat` producer.
  * Fixed a crash in `crop` filter with large `center_bias` value when `use_profile` is 1.
  * Fixed a white video frame appearing on threaded rendering in `freeze` filter.
  * Fixed MLT XML DRD to permit empty playlists, which may occur on empty tracks in a multitrack.
  * Fixed initializing QApplication in the `qimage` producer.
  * Fixed interpolation when scaling with the `affine` rect and geomety properties.
  * Fixed high memory usage with high factors of pitch shifting in the `rbpitch` filter.
  * Fixed a crash on files with more than 32 streams in the `avformat` producer.

Other
  * Fixed CMake build on MSYS2 and Windows Craft.
  * Added the Python binding to the CMake build.
  * Added the `sdl` (v1) module to the CMake build.
  * Removed minrate and maxrate from the `webm` avformat consumer preset.


Version 6.22.1 - July 30, 2020

This patch version only fixes the version reported in the CMake build.


Version 6.22.0 - July 30, 2020

This version fixes bugs associated with the preview scaling introduced in the
previous version.

Framework
  * Added mlt_properties_exists() and Mlt::Properties::property_exists().
  * Added mlt_audio C class with:
    - mlt_audio_new()
	- mlt_audio_close()
	- mlt_audio_set_values()
	- mlt_audio_get_values()
	- mlt_audio_alloc_data()
	- mlt_audio_calculate_size()
	- mlt_audio_plane_count()
	- mlt_audio_plane_size()
	- mlt_audio_get_planes()
	- mlt_audio_shrink()
	- mlt_audio_reverse()
	- mlt_audio_copy()
	- mlt_audio_calculate_frame_samples()
	- mlt_audio_calculate_samples_to_position()
	- mlt_audio_channel_layout_name()
	- mlt_audio_channel_layout_id()
	- mlt_audio_channel_layout_channels()
	- mlt_audio_channel_layout_default()
  * Added Mlt::Audio C++ class with:
    - Mlt::Audio::Audio()
	- Mlt::Audio::Audio(mlt_audio_s*)
	- Mlt::Audio::~Audio()
	- Mlt::Audio::data()
	- Mlt::Audio::set_data(void*)
	- Mlt::Audio::frequency()
	- Mlt::Audio::set_frequency(int)
	- Mlt::Audio::format()
	- Mlt::Audio::set_format(mlt_audio_format)
	- Mlt::Audio::samples()
	- Mlt::Audio::set_samples(int)
	- Mlt::Audio::channels()
	- Mlt::Audio::set_channels(int)
	- Mlt::Audio::layout()
	- Mlt::Audio::set_layout(mlt_channel_layout)
  * Fixed drop-frame timecode for 59.94 fps.
  * Fixed crash on null pointer passed to mlt_consumer_stop().

Modules
  * Fixed frei0r transitions with preview scaling.
  * Fixed affine ox and oy properties incorrect with preview scaling.
  * Fixed a crash and incorrect preview scaling with more than one affine
    filter active on the same frame.
  * Fixed preview scaling for the rotoscoping filter.
  * Added the sample_fmt property to the avformat consumer.
  * Fixed a possible segfault in the mix transition.
  * Removed support for text keyframes to the text and qtext filters
    to fix regression on strings containing '='.
  * Disable frame-threading with bigsh0t, distort0r, and medians frei0r plugins.
  * Added "meta.media.%d.stream.projection" property the avformat producer.
  * Fixed a crash with with filters not supporting preview scale in frei0r
    transitions.
  * Fix artifacts in luma transition and affine filter with frame-threading.
  * Stop including 'title="Anonymous Submission"' in xml consumer.
  * Fixed a crash in opencv.tracker filter.
  * Fixed a crash in composite transition if luma file fails to load.
  * Added validations in opengl module to prevent asserts in Movit.
  * Fixed building with OpenCV 4.
  * Moved some services from gtk2 module to new gdk module:
    - gtkrescale filter
	- pango producer
	- pixbuf producer
  * Deprecated the gtk2 module and no longer enabled by default.
  * Changed avformat producer to accept a '?' in argument/resource property
    by escaping it as '\?'.
  * Changed the background property of the affine filter to be mutable.
  * Deprecated the linsys (DVEO SDI) module.
  * Fixed changing the audio_index property in the avformat producer.
  * Changed resample filter to more resiliant to frequency changes.
  * Added a video_delay property to the sdl2_audio and rtaudio consumers.
  * Add millisecond options to the timer filter.
  * Fixed the in point handling for the timewarp producer.
  * Fixed some audio gaps and sync issues with the rbpitch filter and timewarp
    pitch compensation.
  * Fixed a possible crash caused by producer consumer.
  * Changed avformat consumer to set AVOption color_primaries based on the
    MLT colorspace if not already set as property.
  * Fixed crop right on image with odd width skews image in crop filter.
  * Fixed incorrect silence value for unsigned 8-bit audio in avformat producer.
  * Changed qimage to use Qt's internal orientation detection instead of libexif.
  * Reduced clicks in mix transition by silencing buffers on discontinuity.
  * Improved A/V synchronization in (sw)resample filters - also reduces audio clicks.
  * Improved speed of the qimage producer.
  * Fixed incorrect color using libx264rgb in avformat consumer.
  * Fixed relative paths for avfilters that have the "filename" option.
  * Fixed some avfilters dropping the alpha channel: smartblur, vaguedenoiser.
  * Improved performance of the resize filter.
  * Fixed an affine filter inside a transition was always nearest neighbor
    interpolation.
  * Changed the lift_gamma_gain filter to use round values up.

Other
  * Fixed melt option "-group" applies to an implicit consumer.
  * Added "-quiet" option to melt (implies -silent but more so).
  * CMake build improvments adding modules:
    - gdk
	- jackrack
	- lumas
	- resample
	- sox
	- vorbis
  * Added avformat consumer presets:
    - Slide-Deck-H264
	- Slide-Deck-HEVC
  * Removed intra=1 from some avformat presets (use g=1 for intra only):
    - intermediate/MPEG-2
	- intermediate/MPEG-4
	- lossless/H.264
  * Fixed using Qt, Movit, and WebVfx in the official docker image:
    https://hub.docker.com/repository/docker/mltframework/melt
	IMPORTANT: it now requires `docker run` with the `--init` option.


Version 6.20.0 - February 15, 2020

This version adds support for low resolution preview scaling and adds a
module based on librubberband for audio pitch-shifting.
An official docker image is now available at
https://hub.docker.com/repository/docker/mltframework/melt

Framework
  * Added consumer scaling:
    - mlt_profile_scale_width()
    - mlt_profile_scale_height()
    - Mlt::Profile::scale_width()
    - Mlt::Profile::scale_height()
    - support for a double "scale" property to melt and the xml producer
  * Fixed mlt_properties_set() with an invalid expression.
  * Added new functions that do not evaluate expressions:
    - mlt_properties_set_string()
    - Mlt::Properties::set_string()
  * Improved the service-caching heuristic in mlt_multitrack.
  * Fixed possible crashes in mlt_playlist get_frame() and mlt_filter_process().

Modules
  * Added the rubberband module with a rbpitch filter.
  * Added pitch compensation to timewarp producer.
  * Added the invert_scale property to the affine filter and transition.
  * Added the reverse property to shape filter.
  * Added support for text keyframes to the text and qtext filters.
  * Added support for the CSRT and MOSSE algorithms in opencv.tracker filter.
  * Fixed a crash on empty algo property in the opencv.tracker filter.
  * Changed vorbis module to no longer be deprecated.
  * Improved colorspace conversions in the avformat module.
  * Fixed audio artifacts on initial seek to in point in avformat producer.
  * Fixed the colorspace of the cached image in avformat producer.
  * Fixed white video flashes on property changes in the qtext filter.
  * Fixed a crash in the rotoscoping filter with large spline deviations.
  * Fixed a crash in the sdi consumer if the driver is not loaded.
  * Improved support for a video clip as luma producer to the luma transition.
  * Fixed a crash in the matte transition.
  * Fixed a crash when using invert property =1 in the composite transition.

Other
  * Added a Dockerfile and integrated docker build into Travis CI.
  * Added more avformat consumer presets:
    - intermediate/DNxHR-HQ
    - intermediate/ProRes HQ
    - ALAC
    - FLAC
    * Fixed some parameters in the XDCAM and D10 avformat presets.
    * Fixed link failure on some CPU architectures.


Version 6.18.0 - November 11, 2019

This version is a general maintenance release with a bunch of fixes,
improvements, and additions.

Framework
  * Fixed some data races in mlt_consumer, mlt_deque, and mlt_property.
  * Fixed the mlt_events listener incorrect owner argument.
  * Added support for the LC_ALL environmant variable on Windows.
  * Fixed the argument to mlt_factory_init() not working on Windows.
  * Fixed mlt_service_identify() not reliable in some use cases.
  * Added some default and copy constructors and assignment operators to mlt++
    - Filter()
    - Filter( const Filter &filter )
    - Filter& operator=( const Filter &filter )
    - Producer( const Producer &producer )
    - Producer& operator=( const Producer &producer )
    - Properties( const Properties &properties )
    - Properties& operator=( const Properties &properties )
    - Service( const Service &service )
    - Service& operator=( const Service &service )
    - Transition()
    - Transition( const Transition &transition )
    - Transition& operator=( const Transition &transition )
  * Added mlt_luma_map:
    - mlt_luma_map_init
    - mlt_luma_map_new
    - mlt_luma_map_render
    - mlt_luma_map_from_pgm
    - mlt_luma_map_from_yuv422
  * Fixed preset overrides depend on the XML attribute order.
  * Fixed serializing an animated property with a new length.

Modules
  * Fixed interpolation in rotoscoping filter.
  * Fixed crop filter not working with color producer.
  * Fixed some data races in the sdl and sdl2 consumers.
  * Fixed some data races in the avformat producer.
  * Added a movit.flip filter to the opengl module.
  * Fixed using filters on frei0r producers.
  * Added support for in and out attributes on the "consumer" xml element.
  * Fixed using an in point with the multi consumer.
  * Fixed avfilter fails if the image size changes.
  * Fixed showing superfluous decimals for seconds in the timer filter.
  * Stop serializing an invalid producer as an "INVALID" text producer in xml.
  * Fixed an access violation crash in wave filter.
  * Added the meta.media.color_range property to the avformat producer.
  * Fixed full range yuv422p not converted correctly in the avformat producer.
  * Fixed the text filter not working with pango.
  * Fixed a regression using dynamictext with pango.
  * Added a position property to avfilter for filters that need position info.
  * Fixed avfilter.subtitles not using the source position.
  * Added an analyze property to vidstab filter. When set, analysis only starts
    and the results file written if true.
  * Fixed crash combining affine the affine filter with the shape filter.
  * Added interlace detection from AVCodecContext.field_order.
  * Changed the avformat producer to not use the rescale.interp frame property.
    Previously, when interp == nearest, it would relax seeking. Now, seek
    accuracy is reduced during trick play (rewind or fast forward).
  * Fixed sws flags for auto-inserted scalers in avfilter.
  * Fixed a double free crash in ladspa filter on channel count mismatch.
  * Refactored the composite and luma transitions to use mlt_luma_map.
  * Refactored the pgm producer and shape filter to use mlt_luma_map.
  * Refactored the lumas module to use mlt_luma_map.
  * The lumas module is now disabled by default and must be explicitly enabled.
  * Added property animation to the threshold filter.
  * Added a cairoblend_mode filter to the frei0r module to affect a
    frei0r.cairoblend transition used to composite/blend tracks.
  * Added support for new vaapi options to the avformat consumer:
    - connection_type: x11 or drm
    - driver
    - kernel_driver
  * Fixed the timewarp producer with a colon in the filename.
  * Fixed a relative file name with a colon in it in the xml producer.
  * Fixed defaulting to album or poster art if there is another video stream.
  * Fixed parameter animation in frei0r plugins when using frame threads.
    This change also enables frame-threading for more plugins.
  * Improved the qtblend filter to not process alpha if no transparency.
  * Added a background_color property to the qtblend filter.
  * Fixed the opencv.tracker incorrect behavior on cut clips.
  * Changed opencv.tracker to store absolute frame numbers.
  * Fixed incorrect frame offset on render in opencv.tracker.
  * Add an alpha_over property to luma transition. This addresses a behavior
    regression in version 6.14.0.
  * Fixed noimagecache not working in the avformat producer.

Other
  * Mlt++ now requires C11 compiler support.
  * Fixed closing melt SDL2 window from window manager (i.e. close button).
  * Added -repository option to the melt command.
  * Added unit tests for Mlt::Event.
  * Fixed returning image data for Python 3.
  * Switch to python3 by default.
  * Updated the prores encoding presets to set vendor ID and colr atom.
  * Added a CMake build system. This is not yet prefered over the existing
    configure script and Makefiles and has less flexibility. It is a start and
    has limited support.


Version 6.16.0 - May 7, 2019

This version is released to facilitate packaging the latest version of Shotcut,
which is using new APIs.

Framework
  Added functions to get/set a creation date to a producer:
  - mlt_producer_get_creation_time()
  - mlt_producer_set_creation_time()
  - Mlt::Producer::set_creation_time()
  - Mlt::Producer::get_creation_time()

Modules
  * Fixed dance filter not showing when lower track is transparent.
  * Refactored dynamictext filter to use mlt_producer_get_creation_time().
  * Marked frei0r rgsplit0r plugin version < 1.1 as not thread-safe.
  * Fixed possible null pointer crash in mlt_properties_serialise_yaml.


Version 6.14.0 - March 30, 2019

This version is mostly fixes plus a few API additions and filters.

Framework
  * Added mlt_profile_lumas_dir().
  * Added mlt_frame_get_unique_properties().
  * Added mlt_playlist_reorder() and Mlt::Playlist::reorder().
  * Added some new convenience constructors to mlt++
    - Producer(mlt_profile profile, const char *id, const char *service = NULL)
    - Consumer(mlt_profile profile, const char *id , const char *service = NULL)
    - Transition(mlt_profile profile, const char *id, const char *arg = NULL)
    - Filter(mlt_profile profile, const char *id, const char *service = NULL)
    - Tractor(mlt_profile profile, char *id, char *arg = NULL)
  * Added Mlt::Transition::connect(Service&).
  * Added unit tests for mlt_playlist.
  * Fixed a crash on invalid transition track values in mlt_transition.
  * Fixed a deadlock regression in v6.12.0 of mlt_consumer when starting from
    a paused state (producer speed=0).

Modules
  * The avformat module now requires at least FFmpeg v2.4 or Libav 12.
  * Added mask_start and mask_apply filters to the core module.
  * Added qtext filter to qt module.
  * Changed dynamictext and timer filters to use qtext.
  * Fixed number of digits for seconds in timer filter.
  * Added mlt_image_format property to color producer.
  * Improved color accuracy of libswscale RGB->YUV conversion.
  * Fixed frei0r producer not working with tractor.
  * Fixed decklink consumer stalling on dropped frames.
  * Generate lumas for 16:9, 9:16 (vertical), and square aspect ratios.
  * Fixed crash in qimage when alpha_size is zero.
  * Fixed the mlt_consumer channels property not being passed to multi consumer.
  * Fixed the shape filter for full range color and crashes.
  * Converted the shape filter to use mlt_animation.
  * Added a use_mix property to the shape filter.
  * Fixed invert=1 and mix=100 gives wrong image in shape filter.
  * Fixed a possible free null pointer in the linsys sdi consumer.
  * Fixed using destroyed temporary object in qimage.
  * Fixed a possible null pointer dereference in the spot_remover filter.
  * Fixed memory leak on swr_convert() failure in swresample filter.
  * Fixed possible null pointer dereference in affine when not using rect.
  * Fixed loading image sequence on Windows in qimage.
  * Fixed some null pointer crashes using Movit opengl services.
  * Fixed sdl2 consumer crashes during initialization on Linux or BSD.
  * Fixed distorted image using melt_file.
  * Fixed qimage build on Qt version < 5.5.
  * Added offset property to the timer filter.
  * Changed the boxblur hori & vert properties' minimum to 0.
  * Fixed crash in duplicate frame on rotated videos.
  * Added automatic scaling and padding to avfilter.
  * Fixed field order when encoding progressive as interlace.
  * Fixed frei0r plugins to use the number of slices from the threads property.
  * Fixed over compositing with transparent clips in luma transition.
  * Added sliced processing to dissolve-with-alpha using the threads property.
  * Added createdate keyword to dynamictext filter.
  * Fixed possible crash changing audio_index in avformat producer.
  * Fixed small memory leaks in xml consumer, jackrack, and timewarp producer.
  * Fixed compiling opencv module with OpenCV > 3.

Other
  * Added vertical video profiles:
    - vertical_hd_30
    - vertical_hd_60
  * Mlt++ now requires C++11 compiler support.
  * Added --disable-windeploy to configure to keep bin & lib folders on Windows.
  * Added support for consumer in & out to melt.
  * Fixed color accuracy of lossless/Ut Video preset and use pix_fmt yuv422p.
  * Fixed x264 lossless preset to use crf=0.
  * Fixed compiling with mingw32.
  * Fixed build with Python 3.


Version 6.12.0 - November 26, 2018

This version has many important fixes plus a few new filters and support for
encoding using VA-API.

Framework
  * Changed buffer property to be mutable and adaptive to speed property in
    mlt_consumer.
  * Changed macOS RELOCATABLE build to use standard app bundle layout:
    - lib/mlt      -> ../PlugIns/mlt
    - lib/frei0r-1 -> ../PlugIns/frei0r-1
    - lib/ladspa   -> ../PlugIns/ladspa
    - share/mlt    -> ../Resources/mlt
    - share/movit  -> ../Resources/movit
  * Fixed a_track of transitions matching deleted track in
    mlt_tractor_remove_track().
  * Fixed multi-thread race crash in mlt_properties_clear().
  * Fixed possiblle null pointer crash in mlt_property_get_rect() and
    mlt_property_get_time().
  * Fixed non-animated strings containing ';' or '=' in mlt_animation_parse().
  * Fixed crash in clear_property() with mlt_animation.

Modules
  * Added a generic text filter to the plus module.
  * Added a timer filter to the plus module.
  * Added audio timeout handling to sdl2 consumers.
  * Added spot_remove filter to the plus module.
  * Added dds, ico, and webp filename extensions for qimage producer.
  * Added support for color_range property in avformat consumer:
    "pc" or "jpeg" for full range, otherwise limited range.
  * Added a window property to the audiowaveform filter.
  * Added MM:SS.SS to the timer filter.
  * Added query string param "multi" to the xml producer to force using the
    multi consumer.
  * Improved WebP image support in avformat producer.
  * Integrated hwupload filter in avformat consumer if using VAAPI codec.
  * Changed count producer to use pango if qtext not available.
  * Changed qt moduled to not call XInitThreads()
  * Changed color producer to only set alpha on frame if rgb24a requested or
    not opaque.
  * Changed the xml producer to pass quality and performance parameters to the
    multi consumer.
  * Fixed sdl2_audio distortion (regression in v6.10.0).
  * Fixed dynamictext filter to not error on empty text.
  * Fixed dynamictext aliased (regression in v6.10.0).
  * Fixed qimage outputs premultiplied if scaled internally.
  * Fixed crash in cbrts consumer if running property was never set.
  * Fixed rendering edges of some typefaces in qtext producer.
  * Fixed qimage fails to load with wrong filename extension.
  * Fixed affine dark right and bottom edge artifacts regression in (v6.10.0).
  * Fixed support for vp8 and vp9 with alpha channel in avformat producer.
  * Fixed interpolation mode selection in qimage producer.
  * Fixed crash in qimage with alpha channel.
  * Fixed some AAC MP4 files start playing from middle in avformat producer.
  * Fixed crash in avfilter if initialization fails.
  * Fixed crash in mix when frame rate is very low.
  * Fixed crash on missing luma file in composite transition.
  * Fixed A/V sync on some files in avformat producer.
  * Fixed seeking on audio filter with album art in avformat producer.
  * Fixed colorspace conversion in avformat consumer.
  
Other
  * Added more avformat consumer presets:
    - alpha/Quicktime Animation
    - alpha/vp8
    - alpha/vp9
    - alpha/Ut Video
    - lossless/Ut Video
  * Added square video profiles:
    - square_1080p_30
    - square_1080p_60
  * Added support for nodejs to the swig bindings.
  * Changed configure script to require opencv module be explicitly enabled.
  * Numerous spelling fixes in source code and comments thanks to codespell.


Version 6.10.0 - July 2, 2018

This version fixes bugs and supports serializing animation keyframes with a
specified time format (previously only frame number).

Framework
  * Reverted mlt_pool change in v6.8.0 pending further testing.  
    (USE_MLT_POOL compiler define is now a 0/1 boolean, defaults to 1.)
  * Fixed crash regression in v6.8.0 "parsing non-animated string as an animation."
  * Added pointer checks to mlt_animation.
  * Changed producer cache size heuristic in mlt_multitrack to be more liberal.
  * Fixed handling reserved characters in names for YAML in mlt_properties.
  * Added clamping to prevent computing negative in and out points to mlt_producer.
  * Added functions to serialize animation with a time format:
    - mlt_animation_serialize_cut_tf()
    - mlt_animation_serialize_tf()
    - mlt_property_get_string_tf()
    - mlt_property_get_string_l_tf()
    - mlt_properties_get_value_tf()
    - Mlt::Properties::get(int, mlt_time_format)
    - Mlt::Animation::serialize_cut(mlt_time_format, int, int)
  * Added functions to clear a property to mlt_properties:
    - mlt_property_clear()
    - mlt_properties_clear()
    - Mlt::Properties::clear()
  
Modules
  * Fixed enabling sliced pix_fmt conversion in avformat producer.
  * Fixed incorrect seek and sync on audio files with discard packets.
  * Added support for avcodec_send_frame() API to avformat consumer.
  * Fixed compile errors with Libav master.
  * Fixed a crash in affine transition.
  * Fixed a crash in ladspa filters when consumer frame rate is low (e.g. <= 8).
  * Fixed a crash in boxblur filter.
  * Added animation support to boxblur hori and vert properties.
  * Fixed a crash in movit.convert.
  * Fixed incorrect alpha in affine transition blending routine.
  * Converted frei0r from deprecated mlt_geometry to mlt_animation API.
  * Fixed tilde in text string for pango producer.
  * Fixed using more than one channelcopy filter.
  * Fixed the mono filter reducing volume level.
  * Fixed degraded audio scrubbing in sdl2_audio consumer.
  * Converted dynamictext filter to use affine transition for more correct
    alpha compositing and sub-pixel positioning.
  * Added time format support for animation keyframes to the xml consumer.
  * Added animation support to more affine transition properties:
    - fix_rotate_x
    - fix_rotate_y
    - fix_rotate_z
    - fix_shear_x
    - fix_shear_y
    - fix_shear_z
    - ox
    - oy
    - scale_x
    - scale_y
  * Fixed gaps in text when characters overlap in qtext and kdenlive producers.
  * Fixed a crash in pixbuf producer with multiple render threads.
  * Converted the oldfilm vignette filter from mlt_geometry to mlt_animation.

Other
  * Numerous updates to mlt-xml.dtd.
  * Categorized many of the encode presets (using meta.preset.name).


Version 6.8.0 - May 10, 2018

This version improves support for multi-channel audio and adds some new
manipulation functions to the mlt_animation API.

Framework
  * Added support for musl C library.
  * Added functions for audio channel layouts:
    - mlt_channel_layout_name()
    - mlt_channel_layout_id()
    - mlt_channel_layout_channels()
    - mlt_channel_layout_default()
  * Added channel_layout property to mlt_consumer.
  * Added mlt_channel_layout enum.
  * Disabled memory pooling by default and require compile macro USE_MLT_POOL
    to re-enable it.
  * Fixed reliability of keyframed properties serializing properly.
  * Fixed parsing non-animated string as an animation.
  * Added more functions to mlt_animation:
    - mlt_animation_key_set_type()
    - mlt_animation_key_set_frame()
    - Mlt::Animation::key_set_type()
    - Mlt::Animation::key_set_frame()

Modules
  * Fixed some crashes in qimage producer especially with alpha channel.
  * Fixed >2 channel audio output in the SDL consumers.
  * Fixed >2 channel audio output in the rtaudio consumer on Windows.
  * Fixed vorbis encoding with FFmpeg v3.4+.
  * qimage and qtext are now higher priority than gtk2 pixbuf and pango by the
    loader producer.
  * Added support for more channel counts to decklink consumer.
  * Added swresample filter based on libswresample from FFmpeg. This is now
    the preferred channel count normalizing filter used by the loader producer.
  * Fixed the strange "Undefined constant" and "Unable to parse option value"
    log messages in the the avformat consumer.
  * Fixed GIF and DPX writing in avformat consumer.
  * Reduced the memory usage of the affine transition and filters.
  * Fixed a crash in kdenlivetitle producer.
  * Fixed a crash in the rotoscoping filter.
  * Fixed frame rate reported in Matroska and WebM files produced by the
    avformat consumer.
  * Added sdl2_audio consumer.
  * Fixed alpha channel support for more pixel formats in the avformat producer.
  * Converted the affine transition to use mlt_rect and mlt_animation.
  * Fixed LADSPA plugins with mono channel audio.

Other
  * Fixed a melt command line parsing bug when argument supplied to -transition.
  * Fixed melt with SDL2 on Windows not using stdio and stderr.
  * Improved speed of the vp9 avformat consumer preset.


Version 6.6.0 - January 22, 2018

This version builds upon the previous release with performance improvements
using the sliced image processing framework. It also improves compatibility
with dependencies (FFmpeg, Qt 5, SDL 2, NDI, OpenCV, libebur128).

Framework
  * Added a thread pool to mlt_slices:
    - mlt_slices_run_normal()
    - mlt_slices_run_rr()
    - mlt_slices_run_fifo()
    - mlt_slices_count_normal()
    - mlt_slices_count_rr()
    - mlt_slices_count_fifo()
    - MLT_SLICES_COUNT environment variable
  * Added mlt_log_timings_now() to mlt_log.
  * Added mlt_image_yuv422p16 image format.
  * Added mlt_image_format_planes() and mlt_image_format_id() to mlt_frame.
  * Added mlt_service_disconnect_all_producers() and
    Mlt::Service::disconnect_all_producers()
  * Fixed accuracy of mlt_time_format conversions.
  * Fixed mlt_filter_get_progress() never reaching 1.0.
  * Fixed divide by zero in mlt_filter_get_progress().

Modules
  * Added sdl2 module!
  * Added sum property to mix transition for simple mixing without dynamics.
  * Added TLD and KCF tracking modes to opencv module.
  * Added CSV (comma-separated values) simple slideshow to pixbuf producer.
  * Added jack filter to jackrack module.
  * Added sliced processing to frei0r.
  * Added sliced processing to composite transition.
  * Added sliced processing to avformat producer pixel format conversion.
  * Added sliced processing to affine transition and filter.
  * Converted volume and pan filters to floating point.
  * Added rotate_center property to qtblend transition and filters.
  * Added meta.media.variable_frame_rate (VFR detection) to avformat producer.
  * Added support for external libebur128.
  * Updated internal libebur128 to latest.
  * Added 10-bit capture to decklink producer.
  * Added mlt_image_yuv422p16 to fieldorder filter, avcolour_space filter, and
    avformat consumer.
  * Added no_profile property to xml consumer.
  * Various ndi module fixes and improvements.
  * Fixed setting color_trc in multi consumer.
  * Fixed kdenlive title transparency.
  * Fixed incorrect alpha channel breaking freeze filter with qtblend transition.
  * Fixed transparency of pixbuf images with qtblend transition.
  * Fixed some crashes in new qtblend transition.
  * Fixed building qt module with C++11 for Qt 5.7+.
  * Fixed reporting accurage length for image sequences in qimage and pixbuf.
  * Fixed extra audio samples added to end of file in avformat consumer.
  * Fixed rawvideo export in avformat consumer.
  * Fixed multi-threading with FFmpeg 3.2+ in avformat module.
  * Fixed JPEG album art in avformat producer.
  * Removed filter_avresample (dropped by FFmpeg).
  * Stop flushing audio buffer in decklink consumer.
  * Fixed field order handling in decklink consumer.
  * Make composite transition field order aware.
  * Fixed nesting mlt_tractor with opengl module.
  * Fixed kdenlive titler crash on resized frame.

Other
  * Various memory leak fixes.
  * Fixed opening files with extended chars on Windows (framework and modules).


Version 6.4.1 - November 15, 2016

Hot fix for new C++ symbol Mlt::Profile::is_valid() not declare const in
symbol versioning. This was breaking script bindings.


Version 6.4.0 - November 11, 2016

This is both a bugfix and enhancement release:

Framework
  * Added functions for multi-threaded slice-based image processing:
    mlt_slices_init, mlt_slices_close, and mlt_slices_run.
  * Added Mlt::Profile::is_valid().
  * Added MLT_DIRLIST_DELIMITER to mlt_types.h.
  * Renamed mlt++/config.h to mlt++/MltConfig.h.
  * Fixed mlt_properties_set_lcnumeric() on macOS.
  * Fixed address of Free Software Foundation in comment headers.

Modules
  * Added crop_to_fill property to composite transition.
  * Added sliced_composite property to composite transition.
  * Added peak and true peak properties to loudness_meter filter.
  * Added qtblend transition and filter to qt module.
  * Added ndi (NewTek NDI) module with producer and consumer.
  * Added opencv module with opencv_tracker filter.
  * Added line_spacing, stretch, wrap_width, and wrap_type properties to
    pango producer.
  * Added oblique value for style property to pango producer.
  * Added fontmap-reload event to pango producer.
  * Added support for pkg-config to sdl module.
  * Added .kra (Krita Image) file name extension to loader.dict.
  * Improved performance of kdenlivetitle producer.
  * Improved decklink producer and consumer.
  * Improved accuracy of seeking on lossy compressed audio in
    avformat producer.
  * Improved mix transition using 32-bit floating point.
  * Fixed avfilter when image format changes.
  * Fixed loading relative file name in vidstab filter.
  * Fixed crash on Windows with avfilter.
  * Fixed parsing LADSPA_PATH with semi-colon delimiter on Windows.
  * Fixed parsing FREI0R_PATH with semi-colon delimiter on Windows.
  * Fixed reading relative path with backslash (Windows) in xml producer.
  * Fixed loading relative file name for av.file (avfilter).
  * Fixed loading multiple LADSPA plugins on some systems.
  * Fixed compile error when not configured with --enable-gpl.
  * Fixed loading in avfilter.lut3d in locales with comma decimal point.
  * Fixed a possible crash in resample filter.
  * Fixed alpha channel in kdenlivetitle producer.
  * Fixed possible crash in pixbuf and qimage producers.
  * Fixed count when counting down in count producer.

Other
  * Moved some avformat presets from lossless to new intermediate folder.
  * Added a YouTube avformat consumer preset.
  * Changed metadata.rb metadata publisher to output Markdown.
  

Version 6.2.0 - April 20, 2016

There are no framework changes in this release. The major announcement is the
introduction of support for libavfilter! This is still a work-in-progress.
It is limited to FFmpeg 2.3 and up, and there are a number of filters that
are black-listed because they are known to not integrate with MLT, which is
not a full libav* environment or simple wrapper for it. There are likey
avfilters that are not yet black-listed but might not work because they
have not been completely tested. Also, they do not support MLT's keyframable
property animation nor its frame-threaded parallelism due to architectural
or integration limitations. However, some avfilters are slice-threaded
(internal parallelism), and that works. Finally, libavfilter filtergraph
syntax is not supported either.

All of the supported libavfilters are exposed as MLT filters beginning with
the prefix "avfilter." All of the avfilter parameters are exposed as MLT
properties with the "av." prefix to prevent clashes with MLT properties.
You can run `melt -query filters` to see the new avfilters, and
`melt -query filter=avfilter.rotate`, for example, to view generated
documentation for an individual filter.

Here is a list of notable fixes and enhancements in this release:
  * Added support for libavfilter to avformat module.
  * Added auto-rotate support to avformat producer.
  * Added animated GIF preset for avformat consumer.
  * Prevent serializing and deserializing mlt_type property to xml module.
  * Fixed relative paths for WebVfx "plain:" resources in xml module.
  * Updated libebur128 to v1.1.0 in plus module.
  * Added dynamic_loudness filter to plus module.
  * Added loudness_meter filter to plus module.
  * Qt 5 fixes for kdenlivetitle producer.
  * Added gradients and text shadows to kdenlivetitle producer.
  * Added support for building rtaudio against external build of lib.
  * Upgraded bundled RtAudio to v4.1.2.
  * Added status parameters to ladspa producer and filters.
  * Added 5.1 surround to stereo downmix to audiochannels filter in core module.
  * Fixed compiling SWIG bindings for Ruby 2.0.


Version 6.0.0 - February 17, 2016

This is a bugfix and minor enhancement release. Note that our release
versioning scheme has changed. We were approaching 1.0 but decided to
synchronize release version with the C library ABI version, which is currently
at v6. Here are some of the notable changes and enhancements:

Framework
  * Added unit tests for tractor, multitrack, and field.
  * Deprecate mlt_frame_get_alpha_mask().
  * Added drop_count readable property to mlt_consumer.
  * Added mlt_factory_repository().
  * Added mlt_properties_to_utf8().
  * Define MIN, MAX, CLAMP in mlt_types.h in not already defined.
  * Switched to __APPLE__ and _WIN32 defines throughout codebase.

Modules
  * Added UDP and SMPTE 2022-2 support to cbrts consumer.
  * Fixed build against latest FFmpeg versions - now requires v1.1 and up.
  * Added audiospectrum filter to qt module.
  * Added meta.media.0.codec.rotate property to avformat producer to let apps
    and other services get the media orientation.
  * Make the avformat producer handle animated images.
  * Added style property to dynamictext filter.
  * Added timewarp producer to core module.
  * Fixed slowly accumulating A/V sync drift in mix audio transition.
  * Added width_crop and width_fit properties to pango producer.

Melt
  * Added -abort option to simply exit without full cleanup.
  * Fix key-press handling on Windows.


Version 0.9.8 - July 29, 2015

Here is a list of the enhancements included in this release. There are many API
additions to support the ability for apps to add and remove tracks and represent
and manipulate property animations. There are still many services, however, that
need updating to support animated properties.

Framework
  * Added mlt_service_disconnect_producer() and Mlt::Service::disconnect_producer().
  * Added mlt_multitrack_disconnect() and Mlt::Multitrack::disconnect().
  * Added mlt_tractor_remove_track() and Mlt::Tractor::remove_track().
  * Added mlt_service_insert_producer() and Mlt::Service::insert_producer().
  * Added mlt_multitrack_insert() and Mlt::Multitrack::insert().
  * Added mlt_tractor_insert_track() and Mlt::Tractor::insert_track().
  * Added mlt_transition_set_tracks() and Mlt::Transition::set_tracks().
  * Added Mlt::Properties::get_animation().
  * Added Mlt::Properties::get_anim().
  * Added Mlt:Animation class with methods:
    - length()
    - is_key()
    - keyframe_type()
    - get_item()
    - next_key()
    - previous_key()
    - set_length()
    - remove()
    - interpolate()
    - serialize_cut()
  * Added mlt_animation_key_count() and Mlt::Animation::key_count().
  * Added mlt_animation_key_get() and Mlt::Animation::key_get().

Modules
  * Added audiowaveform video filter.
  * Added fft audio filter.
  * Added dance video filter (uses fft).
  * Added lighshow video filter (uses fft).
  * Added distort property to movit.rect video filter.
  * Added rotate property to pango video producer.
  * Added 2K DCI and 4K modes to decklink producer and consumer.
  * Added audiomap (channel remapping) filter.
  * Added property animation to all LADSPA audio filters and producers.


Version 0.9.6 - March 1, 2015

A major regression slipped into the 0.9.4 release plus some other good fixes
rolled in just after that release prompting this new release. Please discontinue
using version 0.9.4 and upgrade.


Version 0.9.4 - February 15, 2015

This is a bugfix and minor enhancement release. Here are some of the notable
changes and enhancements.

Framework
  * Added color_trc (transfer characteristic) property to mlt_consumer and mlt_frame.
  * Added Mlt::Profile::set_display_aspect(int, int).
  * Added mlt_pool_stat().
  * Added mlt_smpte_df and mlt_smpte_ndf to mlt_time_format for non-drop-frame
    timecode support.
  * Added Mlt::Tractor::Tractor(Mlt::Profile&).
  * Added mlt_frame_get_alpha().
  * Added default, copy, and assignment methods to Mlt::Frame.
  * Added Mlt::Filter::process(Mlt::Frame&).

Modules
  * Added support for color_trc property to avformat and opengl modules.
  * Performance improvements for composite and matte transitions.
  * Added fill, halign, and valign properties to affine transition and filter.
  * Added producer.* and consumer.* properties to consumer producer.
  * Fixes for libavformat and libavcodec v56.
  * Dropped support for FFmpeg < v1.0 and Libav < v9.
  * Added a lumakey filter.
  * Added a localtime property to dynamictext filter.
  * Added date/time format string support to dynamictext filter.
  * Added no_root property to xml consumer.
  * Added audio-only tone producer.
  * Added drop property to count producer.
  * Added caching to pango producer to improve performance.


Other
  * Added WMV and WMA avformat consumer presets.
  * Added a ProRes-Kostya avformat consumer preset.
  * Changed VP9 WebM preset to use Opus audio codec.
  * Added 4K UHD and 2.5K QHD profiles.
  * Added x265-medium and x265-medium-pass1 avformat consumer presets.
  * Added a unit test for Mlt::Frame.


Version 0.9.2 - June 29, 2014

This is a bugfix and minor enhancement release.

Framework
  * Added "boolean" parameter type and "argument" parameter attribute to
    service metadata schema.
  * Added mlt_properties_frames_to_time().
  * Added mlt_properties_time_to_frames().
  * Changed mlt_events_fire() to return the number of listeners.
  * Added consumer-thread-create and consumer-thread-join events.
  * Added LC_NUMERIC handling for Windows.
  * Added mlt_playlist_mix_out() and mlt_playlist_mix_in() 
  * Added mlt_properties_from_utf8()

Modules
  * Renamed "qimage" module to "qt".
  * Added support for Qt 5.
  * Added qtext producer, which is now preferred by dynamictext filter over pango.
  * Added xml-nogl consumer.
  * Consolidated dgraft, burningtv, and rotoscoping into new plusgpl module.
  * Added vid.stab module with vidstab and deshake filters.
    This depends on external vid.stab library unlike its predecessors.
  * Rewrote opengl module.
  * Added loudness filter based on EBU R128.
  * Added rgblut filter to plus module.
  * Added luma-only liftgammagain filter to plusgpl module.
  * Added lift_gamma_gain filter to plus module.
  * Added support new keyframable animated properties to brightness, volume,
    panner, boxblur, wave, sepia, charcoal, burn, gamma, grain, dust, lines,
    tcolor, oldfilm, 
  * Added movit.luma transition to opengl module.
  * Added cbrts consumer to plusgpl module.
  * Removed the "ppm" PPM-pipe producer.
  * Added more VITC functionality to decklink module.
  * Added matte transition to core module.

DEPRECATION WARNINGS
  * Deprecate videostab module with videostab and videostab filters.
    This will not be removed soon in order to keep old scripts and projects
    functional.
  * Deprecate the dv (libdv), kino, and vorbis modules. These are scheduled
    to be removed in next release.


Version 0.9.0 - June 2, 2013

This is a significant enhancement release.

Build (especially interesting for Linux packagers)
 * Added --rename-melt and --enable-extra-versioning configure options.
 * Added symbol versioning on Linux.

Framework
 * Improved pause behavior when using buffered rendering in mlt_consumer.
 * Added mlt_animation API (exposed via Mlt::Properties in C++).
 * Added mlt_rect and mlt_color types.
 * Deprecated mlt_geometry API.

Modules
 * Support for the latest versions of FFmpeg and Libav (but dropping support
   for 0.5 and 0.6 versions).
 * Added alpha channel output to avformat consumer.
 * Added reconnect and exit_on_disconnect properties to avformat producer.
 * Added opengl module that uses Movit for GLSL image processing.
 * Added qglsl consumer to use opengl with avformat, sdi, and decklink.
 * Added avsync module with blipflash producer and consumer for testing.
 * Added new "count" producer to gtk2 module.
 * Changed frei0r to use index-based property names making it impervious to
   param name changes (param name still accepted for compatibility).
 * Added default parameter values to frei0r metadata.

Other
 * Added more python example web services.
 * Added the beginnings of unit test suite.


Version 0.8.8 - January 20, 2013

This is purely a bugfix release. See the ChangeLog or git log.


Version 0.8.6 - November 14, 2012

This is a re-issue of the 0.8.4 release with a fix for a performance
regression on videos that use full-range colorspaces such as yuv420p.

Version 0.8.4 - November 13, 2012

This is a bugfix and minor enhancement release.

* Added playlist-next event and PlaylistNextListener to Ruby binding
* FFmpeg 1.0 and libAV master compatibility
* Improvements to motion_est filter to generate keyframes for apps
* Added audiolevel (measurement) filter


Version 0.8.2 - August 28, 2012

This is a bugfix and minor enhancement release.

* Overhaul of A/V sync with libavformat-based inputs.
* Fix a major memory leak introduced in previous release.
* Fixes to problems revealed by Coverity Scan static analysis.
* Improved encoding presets.
* melt can now be built without SDL with define MELT_NOSDL, which is handy
  for running it as a child process on Windows and OS X.
* melt can now be signaled to quit, which also makes it more useful as a
  child process.

Special thanks to Mikko Rapeli who provided many of the Coverity fixes.


Version 0.8.0 - June 1, 2012

The minor version is increased due to the addition of time properties!
The soname version increased in the process because some mlt_property
functions changed; however, very few if any apps actually directly use
mlt_property preferring to use mlt_properties instead. In addition:

* improve seek speed on AVCHD when using FFmpeg v0.9.1+ (NOT Libav!)
* composite and dissolve speed improvements on x86-64
* improve performance of caching in image producers
* add device enumeration to decklink producer and consumer

Special thanks go to contributors Maksym Veremeyenko and Ed Rogalsky.


Version 0.7.8 - February 13, 2012

This is a bugfix and minor enhancement release.

* Improved support for v53 of libavcodec/libavformat
* Added "multi" consumer - multiple, simultaneous outputs
* Added framerate adaption to "consumer" producer and "multi" consumer
* Can now use YADIF deinterlacer with decklink producer
* Added "rtaudio" consumer for native audio support on multiple platforms
* Added ability to request image format closest to source (mlt_image_none)
* Added more audio formats
* Added vqm (video quality measurement) transition


Version 0.7.6 - October 31, 2011

This is a bugfix and minor enhancement release.

 * Improved support for v53 of libavcodec/libavformat (0.7 and 0.8 releases)
 * Major DeckLink consumer improvements
 * Much more metadata
 * Added audio-only JACK consumer
 * Added video stabilization filters
 * Added dual pass audio normalization to sox filter
 * Added VITC and VANC capture to DeckLink producer
 * Added support for writing timecode tracks
 * Added MLT, frei0r, and SoX version to xml serialization
 * Added D-10, XDCAM, DNxHD, and Sony-PSP encoding presets
 * Can now use rotoscoping for masking filters
 * Added dynamictext filter makes burned-in timecode and similar easier
 * Added support for consumer element in MLT XML
 * Added outlining, padding, and alignment to pango filter

Special thanks go to contributors Maksym Veremeyenko, Brian Matherly, and
Marco Gittler.


Version 0.7.4 - July 16, 2011

This is a bugfix and minor enhancement release.

Framework
 * Important: change consumer property profile to mlt_profile.
 * Improve frame-dropping and drop_max property to mlt_consumer.
 * Added support for presets for any service through special property named
   "properties"
 * Added mlt_profile_from_producer() for auto-profile.
 * Added mlt_properties_set_lcnumeric() and mlt_properties_get_lcnumeric().
 * Added LC_NUMERIC to YAML Tiny metadata schema and parser.

Modules
 * Added support for more than 2 channels of greater than 16-bit audio.
 * Added discrete filters for each SoX effect.
 * Added discrete filters for each LADSPA audio plugin.
 * Added automatic service metadata for SoX and LADSPA plugins.
 * Added at least basic metadata for nearly every service.
 * Added support for decklink on Windows (tested) and Mac OS X (untested).
 * Added support for JACK transport synchronization.
 * Added blacklist.txt to jackrack plugin (contains dssi-vst).
 * Rewrite of decklink consumer.
 * Added support for live network, multi-stream device, and pipe/fifo sources
   in avformat producer.
 * Added LC_NUMERIC attribute to root XML element.

Melt
 * Added '-query presets' option.
 * Added -jack option for transport synchronization.
 * Send -help and -query output to stdout to make it convenient for pagers.

Other
 * Added mlt.Frame.get_image() for Python.
 * Removed configure option --avformat-svn.
 * Fixes for locales that use comma for decimal point.
 * Added presets for DVD, DV, x264, and WebM encoding.

Since FFmpeg forked and there were a few releases, there is no recommended
version at this time. With that said, there were changes to accommodate the
API changes with some moderate testing of the 0.6, 0.7, and 0.8 series
releases of both FFmpeg and Libav.


Version 0.7.2 - May 1, 2011

This is a minor release to fix a few things between the 0.7.0 release
and the release of Kdenlive 0.8. I recommend Kdenlive v0.8 users to
upgrade to this version of Mlt. Beyond that there are some exciting
additions to the Blackmagic Design DeckLink plugin!

Framework
 * Added mlt_profile_list().

Modules
 * Added decklink producer (i.e. capture, live encoding).
 * Added keyer output for decklink consumer.
 * Added AVOptions to the avformat service metadata.
 * Added support for new major API versions (53) of FFmpeg.

Melt
 * Added '-query profile' option.
 * Added '-query formats', '-query audio_codecs' and '-query video_codecs'.

The recommended version of FFmpeg for use with this release is 0.6.1.


Version 0.7.0 - March 27, 2011

This is a major new release due to significant additions to API, framework,
and build.

Build
 * Added support for Windows via MinGW.
 * Enabled linsys module by default.
 * Disabled VDPAU by default and added --avformat-vdpau to enable it.
 * Added support for swfdec 0.7.

Framework:
 * Added parallelism to mlt_consumer when 'real_time' > 1 or < -1.
 * Added mlt_deque_insert() and mlt_deque_peek().
 * Added mlt_profile parameter to mlt_producer_new().
 * Let transitions with no out point run forever.
 * Added mlt_frame_unique_properties().
 * Added mlt_frame_set_image() and mlt_frame_set_alpha().
 * Added mlt_image_format_size() and mlt_audio_format_size().
 * Added mlt_filter_get_length() and mlt_transition_get_length().
 * Added mlt_filter_get_progress(), mlt_transition_get_progress(),
   and mlt_transition_get_progress_delta().
 * Added mlt_filter_get_position() and mlt_transition_get_position().
 * Added mlt_properties_lock() and mlt_properties_unlock().

Modules
 * Added rotoscoping filter.
 * Improve libavdevice support (V4L2, ALSA, libdc1394).
 * Added support for new FFmpeg metadata API.
 * Various fixes, refactoring, and improvements.

The recommended version of FFmpeg for use with this release is 0.6.1.


Version 0.6.2 - January 23, 2011

This is just a minor release to address a few things prior to introducing
major changes from other branches.

 * Added force_aspect_ratio property to pixbuf and qimage producers.
 * Added opacity handling in geometry property of the affine filter and
   transition.
 * Added use_normalised property to affine filter.
 * Added always_active property to affine transition.
 * Fix building on NetBSD.

The recommended version of FFmpeg for use with this release is 0.6.1.


Version 0.6.0 - January 1, 2011

The recommended version of FFmpeg for use with this release is 0.6.1.
There were quite a few enhancements and changes including a minor interface
change. Therefore, this release gets a jump in the versioning.

Framework
 * mlt_profile
   - Added (Y'CbCr) colorspace attribute.
   - Added mlt_profile_clone().
 * Added mlt_consumer_position() and Mlt::Consumer::position().
 * Added Mlt::Properties::wait_for(string).
 * Added a version API: mlt_version_get_int() and others.
 * Added Mlt::Producer::pause().
 * Added mlt_frame_write_ppm() for debugging.

Melt
 * Added automatic detection of profile from first input when profile
   not specified.
 * Now exits with error result when consumer fails fatally.

Modules
 * Added swfdec producer for Flash files including variables support.
   (Does not support audio.)
 * Added consumer for Blackmagic Design DeckLink SDI and Intensity HDMI.
 * Added Y'CbCr colorspace conversion and option to use full luma range.
 * Added (de)serialization of profile to XML.
 * Added support for #frame# variable to the data_show filter.
 * Added support for frei0r string parameters.
 * Make FFmpeg formats and codecs available as properties (not just stderr).
 * Try to load .xml file as MLT XML.
 * Added a consumer-sdl-paused event to sdl_preview.
 * Added a consumer-fatal-error event to avformat.
 * Change composite transition to default to progressive rendering; field-
   based rendering available only explicitly.


Version 0.5.10 - September 13, 2010

This is a quick followup to the 0.5.8 release to address an issue I want to
address immediately. I noticed an extra unconditional colorspace conversion
to and from RGB was added for all YCbCr (YUV) video sources. In addition, I
have enabled the avcolor_space filter on OS X since it works now.


Version 0.5.8 - September 12, 2010

The recommended version of FFmpeg for use with this release is 0.6.
This is a maintenance release to address some bugs that appeared
thus far in the 0.5.x series. Beyond that is a few enhancements:

* Added EXIF-based auto-rotation of images to pixbuf and qimage producers.
* Improved quality of libswscale-based image conversion and scaling.
* Added channelswap and panner audio filters; panner also does balance.
* Improve audio waveform and add audiowave video filter.
* Enhanced luma filter to work with animated filters such as affine.
* Automatically crop 8 bottom lines of 1088 source in a 16:9 project
  (common in Canon EOS digital cameras).
* Added support for inline images in kdenlivetitler.


Version 0.5.6 - June 20, 2010

The recommended version of FFmpeg for use with this release is 0.6.
This is a maintenance release to address some bugs that appeared
this far in the 0.5.x series. Beyond that it a few enhancements:

* Added interpolation to the affine transition and filter.
* Added multi-track audio encoding to avformat consumer.
* Added interlaced field rendering to kdenlivetitle producer.


Version 0.5.4 - April 19, 2010

The recommended version of FFmpeg for use with this release is SVN r21322.
This is another maintenance release to address some bugs that appeared
this far in the 0.5.x series. Beyond that it adds two things that only
very specific users will see:

* Added C# (ECMA CLR) binding (not enabled by default).
* Linsys SDI consumer now configures itself from MLT profile.


Version 0.5.2 - March 10, 2010

The recommended version of FFmpeg for use with this release is SVN r21322.
This is a minor maintenance release, but it is interesting because it now
enables usage of libswscale as the default choice for image scaling,
image format conversion, and color space conversion. That gives better
quality and performance. In addition, there are some improvements in the
sdl_preview consumer to make it suitable for use in OpenShot 1.1. Other
things:

* Fixed mlt++/MltFilteredProducer
* Fixed playing to the end in Kdenlive (mantis bug 1207)
* Fixed crash load uncompressed video
* Fixed compiling yadif for non-sse2 builds


Version 0.5.0 - February 15, 2010

The recommended version of FFmpeg for use with this release is SVN r21322.
This is an enhancement release, confined mainly to the modules rather than
the framework. In particular, this adds support for VDPAU, YADIF, and HD-SDI
technologies!

configure: added --disable-sse2

framework:
* mlt_cache: added mlt_cache_set_size()
* mlt_filter: added data property "service" - set when attached
* mlt_frame:
  - added Doxygen docs
  - added "previous frame" and "next frame" data properties - available
    when its producer has _need_previous_next=1
* mlt_playlist: added support for negative out point same as length-1
* mlt_service:
  - added mlt_service_cache_purge()
  - added "_need_previous_next" handling in mlt_service_get_frame()
  - added firing event "service-changed" in mlt_service_attach()

modules:
* avformat producer:
  - added decoding H.264 with NVIDIA VDPAU
    Requires FFmpeg built with vdpau.
    This is automatically detected and enabled. You can disable this by
	setting environment variable MLT_NO_VDPAU=1 or property novdpau=1.
  - added caching of FFmpeg contexts and decoded images
    This allows large numbers of clips in a project avoiding limitations
	with number of threads and file descriptors permitted per process.
    You can disable image caching with property noimagecache=1.
  - added variant of producer named avformat-novalidate
  - restored support for video4linux(2)
* avformat consumer: added apre, fpre, and vpre preset properties
* crop filter: added center_bias integer property
* deinterlace filter: added the excellent YADIF as a method
* kdenlivetitle producer: added text outlining
* linsys/sdi consumer:
  - added support for HD-SDI
  - changed name from "linsys_sdi" to just "sdi"
* oldfilm filter: added "uneven development" effect
* xml producer: add support for unspecified out points

profiles:
* added several missing ATSC (HD) profiles
* change descriptions from using Hz to fps


Version 0.4.10 - December 8, 2009

The recommended version of FFmpeg for use with this release is SVN r19873.
This is "hotfix" for the 0.4.8 release that fixes a couple of regression
bugs introduced just before the release.


Version 0.4.8 - December 7, 2009

The recommended version of FFmpeg for use with this release is SVN r19873.
This is mainly a maintenance release. Besides bug fixes here are other
notable changes.

modules:
* avformat producer:
  - refactored producer to use much less properties
  - added support for audio_index=all for linsys_sdi consumer
  - added force_fps property (does yet not adjust duration)
* core/crop: added "center" property to crop filter
* linsys_sdi:
  - added support for >2 audio channels
  - added property meta.map.audio.<N>.channels=<integer>
  - added property meta.map.audio.<N>.start=<integer>
* qimage/kdenlivetitle: add typewriter effect


Version 0.4.6 - October 7, 2009

The recommended version of FFmpeg for use with this release is SVN r19873.
This release is an enhancement release along with numerous build, A/V synch,
concurrency, and other bug fixes.

configure:  new option --avformat-svn-version

modules:
* avformat: much improved seeking on H.264/MPEG2-TS (AVCHD) (Ivan Schreter)
* core: new imageconvert and audioconvert filters (framework refactorization)
* linsys: new SDI consumer (Broadcast Centre Europe)
* qimage: new kdenlivetitle producer (J.B. Mardelle and Marco Gittler)
* sdl: new audio_only consumer for OS X

mlt++ and swig: update bindings

framework:
* refactored image format conversion
  mlt_frame.h:
  - added convert_image() virtual function
  - added mlt_image_format_name()
  - removed many mlt_convert_ and scaling/padding functions
* refactored audio format conversion
  mlt_frame.h:
  - mlt_get_audio() virtual function parameters changed
  - added convert_audio() virtual function
  - mlt_frame_get_audio() parameters changed
  - added mlt_frame_set_audio()
  - added mlt_audio_format_name()
  mlt_types.h:
  - deprecated mlt_audio_pcm
  - added mlt_audio_s16
  - added mlt_audio_s32
  - added mlt_audio_float


Version 0.4.4 - June 30, 2009

The recommended version of FFmpeg for use with this release is 0.5.0.
This release is a minor maintenance update to the 0.4.2 - just build and
bug fixes.

* new configure script options:
  --swig-languages
  --rename-melt
  --mandir
  --datadir
* added man page for melt (not installed)
* added invert property to composite transition
* added frei0r plugin blacklist, currently only contains facedetect
* added Lua binding via SWIG


Version 0.4.2 - May 30, 2009

The recommended version of FFmpeg for use with this release is 0.5.0.
This release is a minor maintenance update to the 0.4.0 - just build and
bug fixes.


Version 0.4.0 - May 17, 2009

The recommended version of FFmpeg for use with this release is 0.5.0.

This release is primarily a reorganization of the mlt and mlt++ projects.
In brief:
* "inigo" was renamed "melt"
* "westley" is no longer the XML file extension and root element - they are
  simply "mlt" now
* mlt++ is included with mlt and no longer a separate project
* miracle, valerie, and humperdink were moved to a new, separate project
For details: http://www.mltframework.org/twiki/bin/view/MLT/ExtremeMakeover

avformat producer improvements:
* improve audio synchronization
* improve reliability of video playback with FFmpeg newer than v0.5.0
* improve seeking performance of DNxHD and HuffYUV


Version 0.3.8 - April 15, 2009

The recommended version of FFmpeg for use with this release is SVN r17923.

This almost entirely a bugfix release to coincide with the Kdenlive 0.7.3
release. See the ChangeLog (SVN log) for details.

framework:
* added mlt_cache API
* improved doxygen documentation comments
* added some 15 fps profiles
* improved color property handling (support web-style '#' color value)
* add const qualifier to many string parameters

modules:
* core: improved brightness filter
* core: added image crop filter
* frei0r: added support for producer/source plugins
* frei0r: added support for color parameters
* sdl: added window_background color property


Version 0.3.6 - February 2, 2009

The recommended version of FFmpeg for use with this release is SVN r16849.

This almost entirely a bugfix release to coincide with the Kdenlive 0.7.2
release. See the ChangeLog (SVN log) for details.

framework:
* added mlt_log logging API
* improved doxygen documentation comments

avformat module:
* consumer: report list of muxers when f=list and codecs when acodec=list or
  vcodec=list
* consumer: added support for an=1 or acodec=none and vn=1 or vcodec=none
* producer: list available demuxers and decoders when constructor arg is like
  f-list[[,]acodec-list][[,]vcodec-list]


Version 0.3.4 - December 29, 2008

The recommended version of FFmpeg for use with this release is SVN r16313.

This almost entirely a bugfix release. See the ChangeLog (SVN log) for details.
There are a few notes:

framework:
* improved doxygen documentation comments (work in progress)
  published docs are at http://mltframework.org/doxygen/

avformat module:
* added support for AVOption parsing to producer
* added filter_swscale as alternative rescaler
* added recommended FFmpeg revision to configure option --help
* use recommended FFmpeg revision with --avformat-svn on release versions
* added configure option --avformat-no-codecs
* added configure option --avformat-no-filters

misc:
* new profile atsc_1080i_50
* added --disable-sse option to configure script
* improved build for OS X and x86-64 and improved handling of mmx/sse


Version 0.3.2 - November 10, 2008

In addition to bug fixes detailed in the ChangeLog, here is a list of
enhancements.

framework:
* deprecated mlt-config; use pkg-config instead
* added more HD profiles

modules:
* sdl: added fullscreen property
* sox: sox v14.1.0 compatibility
* gtk: added force_reload property to producer_pixbuf
* frei0r: added support for YAML Tiny metadata
* frei0r: added keyframe support on double and boolean parameters
* oldfilm: added keyframe support for filter_vignette
* kdenlive: added filter_freeze

inigo:
* added -version, -silent, and -progress options
* improved output of usage information
* removed realtime process scheduling


Version 0.3.0 - August 5, 2008

framework:
* fix bugs with introduction of mlt_profile in v0.2.4
* added versioning to libs
* remove module registry and add dynamic module loading:
  added mlt_repository_register, mlt_repository_consumers,
  mlt_repository_filters, mlt_repository_producers, mlt_repository_transitions
* new module metadata system based on YAML Tiny:
  added mlt_repository_register_metadata, mlt_repository_metadata,
  mlt_repository_languages, mlt_properties_is_sequence,
  mlt_properties_parse_yaml, mlt_properties_serialise_yaml, and
  added metaschema.yaml Kwalify schema file
* mlt_consumer: added threaded, non-lossy processing when real_time=-1
* added autoclose property to mlt_playlist for sequential processing
  of very large playlists (prevents resource exhaustion)
* mlt_factory_init now returns the global mlt_repository
* change mlt_repository_fetch to mlt_repository_create
* change mlt_factory_prefix to mlt_factory_directory
* added mlt_field_disconnect_service

modules:
* move all modules from $datadir to $libdir
* new oldfilm module by Marco Gittler
* new frei0r module by Marco Gittler
* new dgraft module by Dan Dennedy for inverse telecine (not ready yet)
* avformat: added support for multi-threaded encoding and decoding
* consumer_avformat: added support for AVOption to support all ffmpeg options
  using ffmpeg-style property names
* consumer_avformat: added support for dual pass encoding
* qimage: added support for Qt4
* sox: added support for sox v14.0.0
* transition_composite: added animatable geometry-type "pan" property to crop
  and pan instead of automatic down-scale

inigo:
* added -query option to lookup module metadata
* added -profile option and support for progress=1 for kdenlive


Version 0.2.4 - August 4, 2007

* framework: new extensible profiles system to replace MLT_NORMALISATION
* module avformat: interlaced coding support for ffmpeg/libavcodec
* module avformat: build improvements for --avformat-svn
* new effectv module with BurningTV video filter
* module qimage: added support for psd, xcf and exr images
* numerous bugfixes


Version 0.2.3 - April 9, 2007

* Addition of kdenlive module
* Support for ffmpeg from subversion
* Support for ffmpeg libswscale
* Copyright and license cleanup


Version 0.2.2 - May 27, 2006

* Prepared specifically for the kdenlive 0.3 release.
* Contains some patches to support rgb24a output for the gdk-pixbuf and qimage
  producers as well as some minor bugfixes.


Version 0.2.1 - December 5, 2005

* Many improvements since initial releases due to development of Shotcut and
  Jahshaka editing interfaces.


Version 0.1.1 - June 9, 2004

* Minor modifications and bug fixes from the previous release. Better
  ffmpeg/avformat integration and more reliable playback.


Version 0.1.0 - May 6, 2004

* First official release