general protection fault libswscale.so.5.5.100

[jnewbigin]

Hi,
I wanted to get V4L2 Video Output (via v4l2sync) so I updated --channel=latest/edge as per #55

Name        Version  Rev   Tracking     Publisher     Notes
obs-studio  25.0.8   1113  latest/edge  snapcrafters  -

Hooray, I have the plugin now.

When I use the plugin with video format YUV420, I get a crash:
[6016161.467415] traps: video-io: video[5423] general protection fault ip:7f578e8d21c6 sp:7f57667fb818 error:0 in libswscale.so.5.5.100[7f578e87b000+81000]

I think this is an ffmpeg bug - perhaps http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=ba3e771a42c29ee02c34e7769cfc1b2dbc5c760a

I tried using the other formats which sometimes report
[swscaler @ 0x563d71465940] Warning: data is not aligned! This can lead to a speed loss

Additionally, when I click Stop, obs-studio crashes

free(): invalid pointer
Segmentation fault

[6017583.212390] traps: obs[8326] general protection fault ip:7ffb46213eae sp:7ffcd804e858 error:0 in libc-2.27.so[7ffb461d5000+1e7000]

[flexiondotorg]

I've forked obs-v4l2sink and cherry-picked some fixed from pull-requests awaiting merges on the upstream project.

• https://github.com/flexiondotorg/obs-v4l2sink/commits/master

I'll include my fork in this build of OBS as I am hopeful it will fix the issue with obs-studio crashing when V4L2 Video Output is stopped.

[jnewbigin]

Working great now!
Thanks

[flexiondotorg]

The FFmpeg bug you referenced is fixed in the 4.3/release branch of FFmpeg which is now used in this snap via 4a67404