[OSX] no audio from ffmpeg/xvid AVI

[rockmelon]

Using OSX 10.3.9, VLC 8.2 on a 1GHz Powerbook.

AVI file are created by ffmpeg July 1 2005 CVS snapshot, which now
supports MP4 encoding via libxvidcore as well as its traditional
inbuilt mpeg4/divx encoder.

I ffmpeg encode the same content to 2 AVI files with vcodec mpeg4 & xvid as the only difference.

In the Messages window, VLC sets up the audio filters identically for both
files, but the xvid version plays silently. No VLC messages and no
console log messages either. Everything appears to be working
fine, but there is no sound/

The xvid version plays fine in MPlayer and on a Neuston HW decoder
(similar to Pinnacle Showcenter, but with Mac support).

Any ideas ?

Thanks,

Rocky

[rockmelon]

Oops - the mpeg4 AVI with audio that played was encoded with ffmpeg 0.4.9-pre1.

Using the July 1 CVS snapshot with vcodec mpeg4 generates a fourcc
of 'FMP4', which VLC does not recognize, but it sets up the audio
filters and plays silence. Using a vcodec of msmpeg4v2 produces
video and silent audio with no errors. Mplayer plays the audio of
all these AVIs fine (with no video for the bad fourcc).

I suspect that all the AVIs generated by ffmpeg CVS versions of
late will have this audio problem in VLC.

It still looks like a VLC issue though.

Rocky

[fkuehne]

That's a known issue (it's quite strange that FFMPEG uses a custom FOURCC for its MPEG4 content). It's going to be fixed in the forthcoming 0.8.3 bugfix-release (to be shipped within the next 2 weeks).

[rockmelon]

Felix, thanks for that.

VLC also seems to have trouble with SET POSITION in AVI files encoded
with recent ffmpeg builds.

ffmpeg -vtag DIVX generates the expected fourcc.

Rocky