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

[Pau Koning]

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.

This doesn't happen with ffmpeg

--- System information. ---
Architecture: amd64
Kernel: Linux 3.11-2-amd64

Debian Release: jessie/sid
500 unstable http.debian.net
1 unstable www.deb-multimedia.org

--- Package information. ---
Depends (Version) | Installed
==========================================-+-=================
libavcodec54 (>= 6:9.1-1) | 6:9.10-1
OR libavcodec-extra-54 (>= 6:9.10) |
libavdevice53 (>= 6:9.1-1) | 6:9.10-1
libavfilter3 (>= 6:9.1-1) | 6:9.10-1
libavformat54 (>= 6:9.1-1) | 6:9.10-1
libavresample1 (>= 6:9.1-1) | 6:9.10-1
libavutil52 (>= 6:9.1-1) | 6:9.10-1
libbz2-1.0 | 1.0.6-5
libc6 (>= 2.14) |
libgnutls26 (>= 2.12.17-0) |
libgsm1 (>= 1.0.13) |
libmp3lame0 |
libopenjpeg2 |
libopus0 (>= 1.1~beta) |
librtmp0 (>= 2.3) |
libschroedinger-1.0-0 (>= 1.0.7) |
libsdl1.2debian (>= 1.2.11) |
libspeex1 (>= 1.2~beta3-1) |
libswscale2 (>= 6:9.1-1) |
libtheora0 (>= 1.0) |
libva1 (>> 1.1.0~) |
libvorbis0a (>= 1.1.2) |
libvorbisenc2 (>= 1.1.2) |
libvpx1 (>= 1.0.0) |
libx264-133 |
libxvidcore4 (>= 1.2.2) |
zlib1g (>= 1:1.2.0) |

Package's Recommends field is empty.

Suggests (Version) | Installed
=============================-+-===========
frei0r-plugins (>= 1.3) |