Bug#731919: [libav] avconv creates broken index+a/v sync problems

[Reinhard Tartler]

Control: tag -1 upstream moreinfo

On Wed, Dec 11, 2013 at 4:38 AM, Pau Koning <paukoning at gmail.com> wrote:
> Package: libav-tools
> Version: 6:9.10-1
> Severity: normal
>
> I convert different files with following snippet to be able to play it
> on different devices
>
> avconv -i "$input" -c:v h264 -c:a ac3 "$output.mkv"
>
> But each output file seems to have big problem. For example the
> generated index (or whatever is used by players for this time line)
> sometimes doesn't work with any device/player I've tested. This can be
> tested by opening the file with vlc and looking at this timeline
> thing. It doesn't show the position of the current playback but the
> jumps directly to the end of the timeline and doesn't move during the
> playback.
>
> Another thing which seems to happen each often is a/v desync. The
> audio starts 3 seconds before the actually video starts. Sometimes the
> video doesn't play at all.
>
> I've also tried mp4 as output but then it stops from time to time
> while decoding on different hardware devices and even drops some
> frames.

Does this also happen with libav 10, which is currently in jessie/testing?

Also, we don't have the resources to handle such requests in Debian.
Please follow the upstream bug reporting guidelines at
https://libav.org/bugreports.html, and please report the bugzilla
number to this bug.

Thanks for your assistance.

> This doesn't happen with ffmpeg

Was this bug in an earlier version of ffmpeg? What fixed it?