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fix: stop faking lossless copies and mirroring corrupt files silently - #40
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Lossy files from the bot (mp3, m4a, ogg, opus, wma) are copied unchanged into lossless outputs instead of being inflated into fake lossless copies, and into lossy outputs of their own codec. ogg and opus are no longer treated as lossless; aif and tak are recognised as lossless. A source that does not decode cleanly now fails: ffmpeg runs with -xerror and a decode error on stderr counts even when it exits 0. No output is written and the source is not retried until its mtime changes. The cover-art retry only fires on errors about the picture stream. ALAC and AAC encodes get ReplayGain, MusicBrainz ids, ISRC, label, catalog number and sort tags as iTunes freeform atoms. The Whisper lyrics fallback is gone; junk lyrics are rejected and the .lrc is owned like its source. The orphan pass re-walks the source and skips young or in-progress files, temp files younger than 10 minutes are kept, the periodic pass logs as "Periodic sync", and its interval is settings.sync_interval_seconds.
Drop openai-whisper (and PyTorch with it) from the dependencies, bump the version to 0.6.0 everywhere it appears, add CHANGELOG.md, and document the lossy-source rules, the extra M4A tags, the removed Whisper fallback and settings.sync_interval_seconds.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughVersion 0.6.0 changes how audio sources are routed and encoded, makes sync intervals configurable, updates cleanup safeguards, and changes lyrics fetching. The release also removes Whisper support and updates configuration compatibility, tests, and documentation. ChangesAudio processing and synchronization
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~50 minutes Change: Bug fix Merge Risk: 🔵 Low · up to The release mostly works as described. A hung ffmpeg process could stall syncing, and an overly broad error match could skip some valid files. Address these before or shortly after merge. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The changes improve corrupt-file handling and cleanup safeguards. However, writable-source deployments can expose new ownership and permission operations to path-replacement races, and a temporary output failure can prevent automatic recovery until the source changes or the process restarts. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 52.03% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 123 functions across 14 files. (8 skipped: 8 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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GeiserX
changed the title
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #40 +/- ##
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+ Coverage 92.97% 95.49% +2.51%
==========================================
Files 8 8
Lines 840 1021 +181
Branches 164 199 +35
==========================================
+ Hits 781 975 +194
+ Misses 39 26 -13
Partials 20 20
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/audio_transcode_watcher/config.py:
- Around line 115-116: Update the validation for sync_interval_seconds in the
configuration class to reject booleans and values that are not integers or
floats before comparing against zero. Raise ValueError for invalid types and
non-positive values so main() can handle configuration errors consistently.
Review comments at @src/audio_transcode_watcher/encoder.py:
- Around line 206-213: Add a finite timeout to the subprocess.run call in
_run_ffmpeg and handle subprocess.TimeoutExpired by returning a failure result
with diagnostic stderr text. Ensure the failure result flows through the
existing failure-recording path, and define the timeout consistently with the
project’s conventions.
- Line 24: Update _DECODE_ERROR_HINTS to match decode-specific error messages
instead of the broad “invalid” substring, which can turn successful FFmpeg runs
into failures. Retain the existing decode-specific hints and add narrow
invalid-data and invalid-residual phrases so unrelated recoverable errors do not
trigger DECODE_ERROR_RC.
Review comments at @src/audio_transcode_watcher/lyrics.py:
- Line 19: Update the `_URL` pattern used by `lyrics_reject_reason()` to
recognize bare domains with suffixes beyond the hard-coded list, including `.co`
and `.xyz`, while preserving detection of `http(s)://` and `www.` URLs. Add a
test confirming four timed lines with distinct bare URLs are rejected rather
than written as a sidecar.
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📒 Files selected for processing (22)
CHANGELOG.mdREADME.mdconfig.example.yamldocs/ROADMAP.mddocs/configuration.mddocs/getting-started.mddocs/how-it-works.mdpyproject.tomlsrc/audio_transcode_watcher/__init__.pysrc/audio_transcode_watcher/config.pysrc/audio_transcode_watcher/encoder.pysrc/audio_transcode_watcher/lyrics.pysrc/audio_transcode_watcher/main.pysrc/audio_transcode_watcher/sync.pysrc/audio_transcode_watcher/utils.pytests/test_config.pytests/test_encoder.pytests/test_lyrics.pytests/test_main.pytests/test_sync.pytests/test_utils.pytools/verify_sync.py
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…ts lossy copy Freeform atoms now use the names MusicBrainz Picard writes (lowercase replaygain_*, "MusicBrainz Track Id" and friends, ISRC, LABEL, CATALOGNUMBER) and sort names go to soar, soaa and soal, so every common reader recognises them. When a lossless source is processed and the output still holds a copy of its lossy twin (X.m4a copied, then X.flac arrives), the copy is removed and the lossless file encoded, instead of the copy blocking the encode. A finished encode is kept: a same-name file is only treated as the copy while it is byte-identical to the lossy source. CI installs FFmpeg so the real-file tests run there, and the new error branches have tests.
…e the interval type From the CodeRabbit review: a hung ffmpeg is killed after 30 minutes and recorded as a failed source, lyrics made only of bare domains such as site.co are rejected like any other advertisement, and a non-numeric sync_interval_seconds raises the normal configuration error instead of a TypeError.
…st on the image's FFmpeg FFmpeg 7.1, the one the Docker image ships, decodes a FLAC with a single flipped bit silently and exits 0. With -err_detect crccheck+explode the decoder verifies each frame checksum and stops on a mismatch, which -xerror turns into a failure. CI's test jobs now run in python:3.14-slim, the image's base, so the real-file tests exercise the same FFmpeg as production. Ubuntu's FFmpeg 6.1 decoded even the heavily corrupted test FLAC without an error.
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Problem
Lossy files from the bot (m4a, ogg, opus) would be inflated into fake lossless copies in the ALAC folder. Whisper wrote junk lyrics. A corrupt FLAC (
Etta James - I'd Rather Go Blind.flac) was mirrored two seconds short without a word. M4A copies lost ReplayGain and the MusicBrainz ids. The five-minute scan once deleted a fresh output the watcher had just written (2026-08-06).Changes
Lossy sources. Lossless is now flac, alac, wav, aiff, aif, ape, wv, tta and tak. Lossy is mp3, aac, m4a, ogg, opus and wma. Ogg and opus used to count as lossless, and aif, tak and wma were ignored. Any lossy source is copied unchanged, same extension, into a lossless output. Into a lossy output it is copied when the codec matches and transcoded only when it differs. One function,
plan_output()insync.py, makes that call for processing, deletion and the orphan pass, so an ALAC folder holding.m4aencodes next to.mp3and.oggcopies works the same everywhere. When a lossless and a lossy file share a name, the lossless one wins. That holds when processing a file, too: ifX.m4awas copied beforeX.flacarrived, processing the FLAC removes the copy and encodes it. A same-name file only counts as the copy while it is byte-identical to the lossy source, so a finished encode is never redone.Fail loudly. ffmpeg runs with
-xerrorand-err_detect crccheck+explode, so a frame whose checksum does not match stops the decode. Without the checksum check, the image's FFmpeg 7.1 decodes a FLAC with one flipped bit silently. An encode running past 30 minutes is killed and counts as a failure. Adecode_frame() failed,invalidorerror while decodingline on stderr counts as a failure even when ffmpeg exits 0. The error is logged with the source file name, no output is written, and the source is skipped until its mtime changes. The retry without cover art now runs only when the error mentions the picture stream (Could not find tag for codec, mjpeg, png, video stream), no longer on anything containing "decode".M4A tags. After an ALAC or AAC encode, mutagen copies 15 tags from the source into the temp file before the rename, using the names MusicBrainz Picard writes: lowercase
replaygain_*,MusicBrainz Track Idand the other MusicBrainz ids,ISRC,LABELandCATALOGNUMBERas freeform atoms, and the sort names insoar,soaaandsoal. It reads Vorbis comments, APEv2 and ID3 (TXXX, UFID, TSRC, TPUB and the sort frames).Lyrics. The Whisper fallback, the
openai-whisperdependency and PyTorch with it are gone.whisper_fallbackandwhisper_modelstill load and log one warning. When the providers return nothing, nothing is written. A result with one repeated token, fewer than 4 timed lines, or only ad lines (URLs or bare domains) is rejected, and the reason goes to INFO. The.lrcis chowned to the source's uid:gid with mode 0664, best effort.Scan vs watcher race. The orphan pass reads the source folder again right before deleting anything. It skips stems that are in progress or whose source or output is younger than 120 s, measured on mtime or ctime because a copy keeps the source's old mtime. Temp cleanup leaves
.tmp__fffiles younger than 10 minutes alone. The periodic pass logs "Periodic sync", and its interval issettings.sync_interval_seconds(default 300).Also: deleting the MP3 next to a FLAC no longer deletes the FLAC's
.lrccopies, lossy copies go through a temp file like encodes,force_reencodepurges only at startup instead of on every periodic sync,tools/verify_sync.pyknows the new extension sets, and there is aCHANGELOG.md. The version is 0.6.0 everywhere.Testing
python:3.14-slim, the image's base, so they use FFmpeg 7.1.5, the version production ships. Result: 340 passed, 0 skipped, 97% coverage. Codecov: patch 96.10% and project 95.49%, against a 90% target on both.-err_detect(checked in apython:3.14-slimcontainer). Ubuntu's FFmpeg 6.1 passed the 400-byte corruption with exit 0 and no stderr, which is why CI no longer uses it..pyconce made a restored file look broken.ruff check src testsreports 37 findings, down from 49 on main. None are new.ruff format --checkwas already failing on 15 files on main. I didn't reformat untouched code.