[FFmpeg-devel] WMV to FLV video/audio desynchronisation

[Jesus Altuve]

Olivier, this is the exact problem I've reported in detail. I'm pretty sure
there is something wrong, because
if you use Mencoder you'll see it works fine.

I upgraded to gcc 4.2, recompiled with/tried different options, tried
almost every flag.. nothing, however
in my case is not always 3 seconds... it varies.3 to 6 and it will happen
coverting to any format, not just flv.


On 8/31/07, Olivier Doucet <olivier.mailing at gmail.com> wrote:
>
> Hi,
>
> I'm actually trying to encode wmv videos to flv format. The sound is
> delayed
> by about 2 or 3 seconds (sound in advance of three seconds on start, and
> no
> sound at the end).
>
> ffmpeg -i myfile.avi -y -r 15 -s 320x240 -ar 22050 -acodec libmp3lame -ab
> 32000 -ac 1 -bt 64000 -vcodec flv -b 400000 myoutput.flv
>
> FFmpeg version SVN-r10260, Copyright (c) 2000-2007 Fabrice Bellard, et al.
> configuration: --enable-libmp3lame --enable-libxvid --enable-shared
> --enable-gpl --enable-libamr-nb --enable-libfaad --enable-libfaac
> --enable-libx264 --enable-libfaac
> libavutil version: 49.5.0
> libavcodec version: 51.42.0
> libavformat version: 51.12.2
> built on Aug 30 2007 14:14:25, gcc: 4.1.1 20070105 (Red Hat 4.1.1-51)
>
> Seems stream 1 codec frame rate differs from container frame rate:
> 1000.00(1000/1) ->
> 25.00 (25/1)
> Input #0, asf, from 'myfile.avi':
> Duration: N/A, bitrate: 221 kb/s
> Stream #0.0: Audio: wmav2, 32000 Hz, stereo, 32 kb/s
> Stream #0.1: Video: wmv1, yuv420p, 320x240, 189 kb/s, 25.00 fps(r)
> Output #0, flv, to 'myoutput.flv':
> Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 400 kb/s, 15.00 fps(c)
> Stream #0.1: Audio: libmp3lame, 22050 Hz, mono, 32 kb/s
> Stream mapping:
> Stream #0.1 -> #0.0
> Stream #0.0 -> #0.1
>
> [...]
> video:1728kB audio:133kB global headers:0kB muxing overhead 4.699934%
>
> What can I do to avoid this ? Is this a "bug" ? an error in the input wmv
> ?
>
>
> I tried with differents wmvs, problem is the same, and delays seems to be
> equal.
>
> The original wmv can be found here :
> http://dl.free.fr/c7sZP9qSa/F954806Ed01.wmv (986KB)
>
>
> Any feedback welcome :)
>
>
> Olivier
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