[Ffmpeg-devel] Re: [BUG] vorbis 5.1 sound distorsion

Baptiste COUDURIER baptiste.coudurier
Tue May 2 21:10:36 CEST 2006

Balatoni Denes wrote:
> Hi!
> Sorry for replying myself, after hacking in fourcc mp4a at the ffvorbis part 
> in the codecs.conf of mplayer, I could play it with -demuxer 35 -ac ffvorbis, 
> however I failed to play it using libvorbis with the same trick. The sound 
> doesn't sound distorted to me apart from the beginning, when the woman is 
> shouting - we could say parts of it is somehow distorted (for about 0.3 
> secs), are you saying that goes away with libvorbis?

Exactly, voices are distorted.

It does not work with libvorbis in mplayer, cause extradata needs to be
parsed like in ffvorbis.

Btw, it seems to me that demux_lavf in mplayer would do better ignoring
codec_tag from libavformat when esds objecttype id is used with 'mp4a' tag.

Thanks for looking, Denes.

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