Possible v4l2src regression bug with consecutive recordings

[Nicolas Dufresne]

Please, file this in bugs.gnome.org:

https://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer


Le jeudi 06 octobre 2016 à 16:42 +0200, Alfonso Rodriguez a écrit :
> Hello everyone,
> 
> We are using GStreamer to record video on our opensource software
> called Galicaster, and we had an issue when starting several
> recordings in fast succession. We narrowed it down to the GStreamer
> pipeline in C, and we discovered what seems to be an issue with the
> gstv4l2allocator when a recording closes. When this issue happens,
> the device is 'busy' for the next pipeline.
> 
> The script we used for testing is the following:
> http://paste.ubuntu.com/23284568/
> 
> It executes a simple pipeline over and over using the same device
> until it fails.
> 
> We executed the script with GST_DEBUG=3 and we got the following
> error (full output in http://paste.ubuntu.com/23284592/):
> 0:00:27.492185197 11963      0x25bc830 ERROR          v4l2allocator
> gstv4l2allocator.c:1245:gst_v4l2_allocator_qbuf:<gc-v4l2-
> src:pool:src:allocator> failed queueing buffer 1: Invalid argument
> 0:00:27.492207147 11963      0x25bc830 ERROR         v4l2bufferpool
> gstv4l2bufferpool.c:1127:gst_v4l2_buffer_pool_qbuf:<gc-v4l2-
> src:pool:src> could not queue a buffer 1
> 
> This was reproduced on an Ubuntu 16.04.1 machine with GStreamer
> version 1.8.2 using the Logitech HD Webcam C910 and the HD Pro Webcam
> C920. We could also reproduce this behaviour with lower quality
> Logitech cameras, but it would take longer to reproduce. It seems
> that the chance to reproduce the issue is proportional to the video
> bandwidth.
> 
> We think it's a regression bug, because we were not able to reproduce
> said behavior on the GStreamer 0.10 and 1.2 versions.
> 
> I attached a gist with more information about the tests we did:
> https://gist.github.com/Alfro/d94deab6b5b5314f2cee8167019c7239
> 
> Should we create a bug in bugzilla with this information? Does anyone
> have a similar experience?
> 
> Regards, 
> 
> Alfonso Rodríguez Pereira
> TELTEK Video Research
> http://teltek.es/
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel