avconv from libav-tools.deb generate bad video in trusty/utopic but only "happened in i386 not amd64"

[Wei Tsui]

I have a series of x86 machines for converting multimedia, but an bug from avconv(from libav-tools.deb) annoyed me for a long time (and it even happen in 14.10) that mixing video and audio using avconv generated a bad media output - output video is continuity continuously suspended, which cannot be used (output audio is okay).

Finnally, I find out that it only happens in 32bit 14.04 and 14.10, but it's hard to replace i386 to amd64.

 A command to reproduce the bug:

 > avconv -f x11grab -i :0.0 -f alsa -i pulse -f flv -ar 22050 test.flv

 Ubuntu 12.04.5 i386:good, amd64:good
 Ubuntu 13.10 i386:good, amd64:good
 Ubuntu 14.04.1 i386:bad, amd64:good
 Ubuntu 14.10 i386:bad, amd64:good

 'bad' warning forever:

 Non-monotonous DTS in output stream 0:1; previous: 3947, current: 3891; changing to 3947. This may result in incorrect timestamps in the output file.

 Need help, thanks!

[Wei Tsui (ghostplant)]

This bug is not caused by flv format, this command also failed:

avconv -f x11grab -i :0.0 -f alsa -i pulse -vcodec h264 -acodec libmp3lame test.mp4

[Wei Tsui (ghostplant)]

The following command will be more clear to show the result of output video effect:

avconv -f video4linux2 -i /dev/video0 -f alsa -i pulse -f flv -ar 22050 test.flv

[Sebastian Ramacher (s-ramacher)]

If this still an issue in newer versions of libav, please follow https://libav.org/bugreports.html and report the bug upstream.

[Launchpad Janitor (janitor)]

[Expired for libav (Ubuntu) because there has been no activity for 60 days.]