[Bug]: OpenScreen crashes when starting a recording on Ubuntu 24.04 #1340

Activity

1. PyVoyager

   added

   bugSomething isn't workingSomething isn't working

   on Oct 18, 2026
2. EtienneLescot commented on Oct 19, 2026

   

   EtienneLescot

   on Oct 19, 2026

   Member

   More actions

   Thanks for the report. The libavcodec crash in avcodec_open2 is a lead, but your report says both Ubuntu 24.04 and 22.04: which one is it? Could you also send the Mesa version, the output of vainfo, the lines of the terminal output containing capture-linux after the crash, and a Save Diagnostics file if the app still opens? That tells us which encoder it tried to open.
3. PyVoyager commented on Oct 24, 2026

   

   PyVoyager

   on Oct 24, 2026

   Author

   More actions

   Sorry for the delay. The OS is Ubuntu 24.04.5 LTS (22.04 was my mistake).

   I updated to 2.1.2. Now recording never starts: I select "Entire Screen" in the GNOME Share Screen dialog and click Share, and after 1–2 seconds OpenScreen shows "Error: The screen capture request was cancelled." So I can't reach the old libavcodec crash anymore.

   System:

   • Ubuntu 24.04.5, GNOME 46, X11 session
   • xdg-desktop-portal-gnome 46.2
   • AMD Radeon R5 (carrizo), Mesa 25.2.8
   • vainfo: H.264 encode supported (VAEntrypointEncSlice), HEVC decode only

   Log:

   [capture-linux] click-capture-unavailable: no readable /dev/input pointer device ...
   [capture-linux] click-capture-unavailable: no readable /dev/input pointer device ...
   [capture-linux] portal-cancelled: The screen capture request was cancelled.
   Could not prepare the native Linux capture: Error: The screen capture request was cancelled.
   [native-linux] starting capture { prepared: false, cursor: { mode: 'editable-overlay' }, video: { fps: 60 } }
   [capture-linux] portal-cancelled: The screen capture request was cancelled.
   Failed to start native Linux recording: Error: The screen capture request was cancelled.
   

   The portal itself works: calling the ScreenCast portal directly (CreateSession -> SelectSources -> Start) with the same options (types=1, cursor_mode=4, persist_mode=2) and clicking Share returns a stream normally.

   Two "click-capture-unavailable" lines appear before the first cancel, so maybe two capture sessions are started at once.

   Save Diagnostics is not attached: the app hangs after the error.
4. marcscama commented on Oct 25, 2026

   

   marcscama

   on Oct 25, 2026

   Last edited by marcscama

   More actions

   I confirm a similar bug with X11 with Debian Sid KDE! Wayland works.
5. EtienneLescot commented on Oct 28, 2026

   

   EtienneLescot

   on Oct 28, 2026

   Member

   More actions

   Thanks @PyVoyager, your log was the key: the two click-capture-unavailable lines do mean two capture sessions. A second Record press while the GNOME picker is open started a second one, and the two discarded each other's grant, so prepared: false followed your Share. #1413 ignores that second press.

   One question to confirm it is your case: did the picker take a moment to show, or open behind another window, so that Record got pressed again? If you saw only one dialog and pressed once, the X11 portal itself is at fault and #1328's direct X11 capture is the way. @marcscama, same question on KDE X11.
6. EtienneLescot

   added a commit that references this issue on Oct 28, 2026

   fix(linux): ignore a second record press while the portal picker is up

   ...

   1b86183
7. marcscama commented on Oct 28, 2026

   

   marcscama

   on Oct 28, 2026

   More actions

   Thanks. Not the double-press case on my side: I pressed Record once, and no picker dialog appeared at all. So it’s the second case, the X11 portal itself is at fault.

   Debian sid, KDE Plasma on X11 (kwin_x11), xdg-desktop-portal 1.20.4, xdg-desktop-portal-kde 6.6.5, OpenScreen 2.1.2 (.deb).

   In my diagnostic the two failures are sequential, not overlapping: prepare (CreateSession fails), then start ~3 s later after the countdown (fails again), each within ~50 ms, with portal-failed: CreateSession: Portal request didn't succeed: Other (not portal-cancelled). The portal journal says each time:
   xdp-kde-screencast: zkde_screencast_unstable_v1 does not seem to be available
   KWin only exposes that protocol on Wayland (known KDE limitation: https://bugs.kde.org/show_bug.cgi?id=454985). Wayland works for me.

   One caveat for #1328: on KDE X11 org.freedesktop.portal.ScreenCast is on the bus (busctl --user introspect org.freedesktop.portal.Desktop /org/freedesktop/portal/desktop lists it), only CreateSession fails. A check based on the interface being absent (the Xfce case) wouldn’t select direct X11 capture here, so it should also cover a failing CreateSession.

   Happy to test a #1328 build on KDE X11.