[MPlayer-dev-eng] Re: Last call for pre8

[Roberto Togni]

On Sat, 29 Apr 2006 11:53:05 +0200
Matthias Wieser <mwieser at gmx.de> wrote:

[...]
> I have a problem related to another common mobile video format:
> Mpeg4+aac in a MP4 container.
> 
> I'm using
> mencoder /big/Medien/Video/test.mpg \
>  -oac faac -faacopts br=96 \
>  -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:vbitrate=300 \
>  -of lavf -lavfopts 
> i_certify_that_my_video_stream_does_not_use_b_frames:format=mp4 \
>  -endpos 10 -o test.mp4
> 
> ffmpeg:
> ffmpeg -y -i /big/Medien/Video/test.mpg  -b 300 -t 10 -ac 1 -ab 96 -acodec 
> aac -vcodec mpeg4 test-ffmpeg.mp4
> 
> The two resulting videos can both be played with mplayer and the player of 
> the mobile phone (Nokia 6280). But the latter one does not play any sound 
> with the mencoder generated file. The ffmpeg file works perfectly with both 
> players.
> 
> mplayer -v shows some differences, especially the ESDS MPEG4 Descriptors are 
> mission in the mencoder generated file:
> 
> diff mencoder.txt ffmpeg.txt
> [...]
> > ESDS MPEG4 Decoder Specific Descriptor (2Bytes)
> > ESDS MPEG4 Sync Layer Config Descriptor (1Bytes)
> >  -> predefined: 2
> [...]
> < Fourcc: mp4v  Codec: ''
> ---
> > Fourcc: mp4v  Codec: 'mpeg4'
> [...]
> 
> Maybe there is a MP4 containter bug in mencoder?

Is it related to the faad2 update and/or is it a regression since pre7?
If not, unless you have a trivial patch to fix it, I'm not going to
delay the release for it, it's just one more bug.

Ciao,
 Roberto