[FFmpeg-trac] #3189(undetermined:new): video audio recording, A-V drift

[FFmpeg]

#3189: video audio recording, A-V drift
-------------------------------------+-------------------------------------
             Reporter:  unknow       |                     Type:  defect
               Status:  new          |                 Priority:  wish
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hello,

 video/audio sync drift while doing real time recording with mp4 or mkv
 while with ffm it's totaly fine

 {{{
 ffmpeg -re -f alsa -i default -f x11grab -r 25 -s 1152x864 -i :0.0 -acodec
 libfaac -vcodec libx264 -preset superfast -threads 1 ~/rec.mkv # or .mp4
 }}}
 (the -re flags isn't needed to reproduce, in #615, starting at comment 23,
 i tested with other audio/video codec)

 the same commande with .ffm output make the audio/video in sync

 convert the .ffm back to mkv don't make the video/audio go out of sync

 this isn't realy important to me since i can record in .ffm and remux in
 mkv or other if needed

 {{{
 ffmpeg version N-42597-g7f11c53 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Dec  1 2013 18:51:08 with gcc 4.8 (Debian 4.8.2-1)
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
 shared --enable-gnutls --enable-fontconfig --enable-libmp3lame --enable-
 libfreetype --enable-libfaac --enable-libopenjpeg --enable-libopus
 --enable-librtmp --enable-libtheora --enable-libvo-aacenc --enable-
 libvorbis --enable-libvpx --enable-libx264 --enable-openssl --enable-
 x11grab --enable-avresample
   libavutil      52. 54.100 / 52. 54.100
   libavcodec     55. 44.100 / 55. 44.100
   libavformat    55. 21.101 / 55. 21.101
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 91.100 /  3. 91.100
   libavresample   1.  1.  0 /  1.  1.  0
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 }}}

 thanks for reading and maybe looking into it, i will maybe do some more
 testing if i have the time.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3189>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker