[Ffmpeg-devel] ac3 -> no sound

[Edmund Mergl]

Hello Justin,

thanks for answering.

A sample of the output can be found here:  http://www.edmund-mergl.de/test-part.avi
It has been prepared with the following command:
ffmpeg -i test-part.vob -f avi -vcodec mpeg4 -b 3000 -g 300 -acodec ac3 -bf 2 -s 720x528 test-part.avi
I used the CVS version from yesterday.
mplayer and xine have no sound although the sound is ok, when playing the vob file.

Edmund




Justin Ruggles wrote:
> Hello,
> 
> Edmund Mergl wrote:
> 
>>I'm trying to recode a vob-file retaining the orignal ac3 sound.
>>The result is an avi, whithout any sound :-(
>>This is the command-line I've used:
>>ffmpeg -i test.vob -f avi -vcodec mpeg4 -b 3000 -g 300 -acodec ac3 -bf 2 -s 720x528 test.avi
>>
>>Playing the original vob file with xine or mplayer has sound.
>>
>>Recoding the vob-file and converting the sound to mp3 is ok:
>>ffmpeg -i test.vob -f avi -vcodec mpeg4 -b 3000 -g 300 -acodec mp3 -bf 2 -s 720x528 test.avi
>>
>>Only ac3 does not work.
>>Here is the output from ffmpeg (source from CVS today, same problem with older versions):
>>
>>
>>FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
>>   configuration:  --enable-shared --enable-gpl --enable-mp3lame --enable-a52 --enable-amr_wb --enable-amr_nb --enable-faad --enable-faac
>>   libavutil version: 49.0.0
>>   libavcodec version: 51.8.0
>>   libavformat version: 50.4.0
>>   built on Apr  3 2006 09:48:37, gcc: 4.0.2 20051125 (Red Hat 4.0.2-8)
>>Input #0, mpeg, from 'test.vob':
>>   Duration: 00:26:10.2, start: 0.280633, bitrate: 5469 kb/s
>>   Stream #0.0[0x1e0], 29.97 fps(r): Video: mpeg2video, yuv420p, 720x480, 9800 kb/s
>>   Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, 192 kb/s
>>Output #0, avi, to 'test.avi':
>>   Stream #0.0, 29.97 fps(c): Video: mpeg4, yuv420p, 720x528, q=2-31, 3000 kb/s
>>   Stream #0.1: Audio: ac3, 48000 Hz, stereo, 64 kb/s
>>Stream mapping:
>>   Stream #0.0 -> #0.0
>>   Stream #0.1 -> #0.1
>>Press [q] to stop encoding
>>
>>
>>The first 200 MB of the original vob-file can be found here:  http://www.edmund-mergl.de/test-part.vob
>>(in this movie the sounds starts after 2 minutes)
>>
>>
>>Edmund
> 
> 
> I can't reproduce the problem here. Using latest CVS, the result plays
> just fine for me with both ffplay and mplayer.  There is some low-volume
> sound right away, and dialog starts after about 3 minutes.  Maybe give a
> link to a sample of your output file so the problem can be traced to
> either the encoder or your decoder.
> 
> -Justin
> 
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