Crash when playing DVD with VLC & vlc-pause-click-plugin

[kinoegit]

Checklist

• I have went over the Troubleshooting section and the issue still persists.

Environment

• OS: Arch Linux/ Kernel v 6.12.10 / Plasma 6.2.5, Wayland/ Intel® Core™ i5-10600 CPU
• VLC version: 3.0.21
• VLC bitness: 64 bit
• Plugin version: 2.2.0
• Plugin bitness: 64 bit

Describe the bug

VLC crashes when trying to start a DVD with vlc-pause-click-plugin enabled

Steps to reproduce

• enable vlc-pause-click-plugin exactly as instructed (it works with NON-DVD videos)
• insert DVD
• start VLC and start to play (ctrl + d) DVD

Observed behavior

VLC crashes with log as follows:

vlc[60301]: [0000588518b1afc0] main audio output error: too low audio sample frequency (0)
vlc[60301]: [000076f8101aa0d0] main decoder error: failed to create audio output
vlc[60301]: [0000588518b1afc0] vlcpulse audio output error: digital pass-through stream connection failure: not supported
vlc[60301]: [0000588518b1afc0] main audio output error: module not functional
vlc[60301]: [000076f8101aa0d0] main decoder error: failed to create audio output
kmix[2010]: adding 4 mixers
kmix[2010]: mixer "PulseAudio::Playback_Devices:1" "playback devices"
kmix[2010]: PulseAudio adding 1 devices
kmix[2010]: mixer "PulseAudio::Capture_Devices:1" "recording devices"
kmix[2010]: PulseAudio adding 1 devices
kmix[2010]: mixer "PulseAudio::Playback_Streams:1" "playback streams"
kmix[2010]: PulseAudio adding 3 devices
kmix[2010]: mixer "PulseAudio::Capture_Streams:1" "recording streams"
kmix[2010]: PulseAudio adding 0 devices
vlc[60301]: libva error: /usr/lib/dri/i965_drv_video.so init failed
vlc[60301]: [000076f804001f40] glconv_vaapi_x11 gl error: vaInitialize: unknown libva error
vlc[60301]: libva error: /usr/lib/dri/i965_drv_video.so init failed
vlc[60301]: [000076f804001f40] glconv_vaapi_drm gl error: vaInitialize: unknown libva error
vlc[60301]: Xlib:  extension "DRI2" missing on display ":1".
vlc[60301]: libva error: vaGetDriverNames() failed with operation failed
vlc[60301]: [000076f804001f40] glconv_vaapi_drm gl error: vaInitialize: operation failed
vlc[60301]: Failed to open VDPAU backend libvdpau_nvidia.so: could not open shared-object-file: file or directory not found
kernel: vlc[60332]: segfault at 10 ip 000076f8265b3122 sp 000076f8266bf6e0 error 4 in libgl_plugin.so[5122,76f8265b0000+a000] likely on CPU 0 (core 0, socket 0)
kernel: Code: c9 ff 90 a0 00 00 00 4c 8b 43 40 31 f6 bf f2 0c 00 00 48 83 c4 20 41 ff 90 80 00 00 00 41 39 ae 50 01 00 00 7e 42 48 8b 4b 40 <41> 8b 74 ac 10 bf ec 88 00 00 ff 91 a0 01 00 00 49 83 7c 24 50 00
systemd-coredump[60354]: Process 60301 (vlc) of user 1000 terminated abnormally with signal 11/SEGV, processing...
systemd[1]: Started Process Core Dump (PID 60354/UID 0).
systemd[1]: Started Pass systemd-coredump journal entries to relevant user for potential DrKonqi handling.
systemd-coredump[60355]: [🡕] Process 60301 (vlc) of user 1000 dumped core.
                                              
                                              Stack trace of thread 60332:
                                              #0  0x000076f8265b3122 n/a (libgl_plugin.so + 0x5122)
                                              #1  0x000076f8265b63f3 n/a (libgl_plugin.so + 0x83f3)
                                              #2  0x000076f883a6ee44 n/a (libvlccore.so.9 + 0x7de44)
                                              #3  0x000076f883a748d1 n/a (libvlccore.so.9 + 0x838d1)
                                              #4  0x000076f883b9739d n/a (libc.so.6 + 0x9439d)
                                              #5  0x000076f883c1c49c n/a (libc.so.6 + 0x11949c)
                                              
                                              Stack trace of thread 60302:
                                              #0  0x000076f883c0e63d __poll (libc.so.6 + 0x10b63d)
                                              #1  0x000076f88098ca78 n/a (libpulse.so.0 + 0x32a78)
                                              #2  0x000076f880976654 pa_mainloop_poll (libpulse.so.0 + 0x1c654)
                                              #3  0x000076f8809807c5 pa_mainloop_iterate (libpulse.so.0 + 0x267c5)
                                              #4  0x000076f880980891 pa_mainloop_run (libpulse.so.0 + 0x26891)
                                              #5  0x000076f880991bd4 n/a (libpulse.so.0 + 0x37bd4)
                                              #6  0x000076f88093734f n/a (libpulsecommon-17.0.so + 0x5d34f)
                                              #7  0x000076f883b9739d n/a (libc.so.6 + 0x9439d)
                                              #8  0x000076f883c1c49c n/a (libc.so.6 + 0x11949c)
                                              
                                              Stack trace of thread 60308:
                                              #0  0x000076f883b93a19 n/a (libc.so.6 + 0x90a19)
                                              #1  0x000076f883b96479 pthread_cond_wait (libc.so.6 + 0x93479)
                                              #2  0x000076f851b1372e n/a (libgallium-24.3.3-arch1.2.so + 0x51372e)
                                              #3  0x000076f851ade70c n/a (libgallium-24.3.3-arch1.2.so + 0x4de70c)
                                              #4  0x000076f851b1365d n/a (libgallium-24.3.3-arch1.2.so + 0x51365d)
                                              #5  0x000076f883b9739d n/a (libc.so.6 + 0x9439d)
                                              #6  0x000076f883c1c49c n/a (libc.so.6 + 0x11949c)
                                              
                                              Stack trace of thread 60305:
                                              #0  0x000076f883c0ebb0 ppoll (libc.so.6 + 0x10bbb0)
                                              #1  0x000076f880d70327 n/a (libglib-2.0.so.0 + 0xc0327)
                                              #2  0x000076f880d0ca55 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca55)
                                              #3  0x000076f8794fe16f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2fe16f)
                                              #4  0x000076f8794a6b5c _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2a6b5c)
                                              #5  0x000076f8794b305d _ZN16QCoreApplication4execEv (libQt5Core.so.5 + 0x2b305d)
                                              #6  0x000076f87a9e6e45 n/a (libqt_plugin.so + 0x1e6e45)
                                              #7  0x000076f87a89563a n/a (libqt_plugin.so + 0x9563a)
                                              #8  0x000076f883b9739d n/a (libc.so.6 + 0x9439d)
                                              #9  0x000076f883c1c49c n/a (libc.so.6 + 0x11949c)
                                              
                                              Stack trace of thread 60329:
                                              #0  0x000076f83d8180f6 n/a (libavcodec.so.58 + 0xa180f6)
                                              ELF object binary architecture: AMD x86-64

Expected behavior

VLC should play DVD videos with vlc-pause-click-plugin enabled

Additional info

VLC with vlc-pause-click-plugin DISABLED does play the DVD video flawlessly
The same with VLC AppImage version 3.0.21

[nurupo]

Able to reproduce. While I'm still looking into the cause of the crash, here are some notes meanwhile. Mostly just for myself to keep track of.

Environment:

• x86_64 Linux, VLC 3.0.21 64-bit
• Intel i7-2720QM
• No GPU, iGPU-only
• A DVD disk with interlaced video on it behind a chapter select menu

Steps to reproduce:

1. Insert DVD disk
2. Open VLC
3. Ctrl+D -> Play
4. DVD menu appears, listing the chapters on the DVD
5. Select a chapter to play

Configuration 1

• VLC has hardware-accelerated decoding disabled
• The plugin is enabled

Once a chapter is selected in step 5, VLC crashes:

kernel: vlc[2336]: segfault at 10 ip 00007f6b7ef4c1eb sp 00007f6b7f0557a0 error 4 in libgl_plugin.so[7f6b7ef43000+c000]

Configuration 2

• VLC has hardware-accelerated decoding disabled
• The plugin is disabled (must restart VLC)

There is no crash, the video plays just fine past the step 5.

Configuration 3

• VLC has hardware-accelerated decoding set to Automatic
• The plugin is enabled

There is no crash, the video plays just fine past the step 5 and the plugin functions as intended - I'm able to click to pause.

[nurupo]

Looks like it's not a bug in my plugin but a general bug with interlaced videos in VLC3, as it crashes even on a regular interlaced video file with just the built-in "FPS conversion video filter" enabled, without my plugin used. It also crashes on a dummy video filter plugin that doesn't do anything.

I have filed a bug report with VLC about this: https://code.videolan.org/videolan/vlc/-/issues/28951

Setting Hardware-accelerated decoding to Automatic might fix the crash, as it does for me, though it should already be set to that by default I believe.

[nurupo]

I might have found a way to work around this bug. Will need to perform further testing on it, to make sure it works on across VLC versions and on Windows.

[nurupo]

The crash is also reproducible on Windows if the Video output is set to "OpenGL video output" or "OpenGL video output for Windows".