[Ffmpeg-devel] WMA encoding and Windows Media Player for Mac OS X

Patrice Bensoussan patrice.bensoussan
Sat Mar 3 20:03:04 CET 2007

 >> On 8 Feb 2007, at 23:05, Michael Niedermayer wrote:
 >> >Hi
 >> >
 >> >On Thu, Feb 08, 2007 at 10:37:54PM +0000, Patrice Bensoussan wrote:
 >> >>Hi,
 >> >>
 >> >>All the files encoded by ffmpeg in wma (using wmav1 or wmav2) will
 >> >>open in Windows Media Player for Mac OS X, but you don't hear
 >> >>anything (it only plays silence). The same file seems to play
 >> >>correctly with mplayer or QuickTime with the Flip4Mac codec.  
Any idea
 >> >>what could be wrong in the encoding which would cause Windows  
 >> >>Player for Mac OS X to play only silence? The information  
window in
 >>> >>Windows Media player on a converted file shows:
 >> >>
 >> >>audio codec unknown
 >> >>video codec wmav1
 >> >>
 >> >>Am I missing an option, or is this a known bug in ffmpeg?
 >> >>Thanks,
 >> >
 >> >hmmmm :(
 >> >does it work if you mux into .avi ?
 >> Believe it or not, Windows Media Player doesn't play .avi files on
 >> Mac ;-)
 >> >does it work if you -acodec copy a working wma into .asf ?
 >> No, same problem. The interesting thing is when doing this, the
 >> original file shows:
 >> Length: 00:35
 >> Bit Rate: 160 Kbps
 >> Media Type: Audio
 >> Audio Codec: Windows Media Audio V8
 >> Video Codec: Unknown
 >> whereas the .asf generated with -acodec copy shows:
 >> Length: 00:34
 >> Bit Rate: 160 Kbps
 >> Media Type: Audio
 >> Audio Codec: Unknown
 >> Video Codec: wmav2
 >> So the codec info is stored at the wrong place it seems? (video
 >> instead of audio) Not sure this is related though.
 >ive changed a few things in the asf muxer, please retry and report  
if theres
 >any improvment (or other change)

Sorry forgot to test this one...

I can actually hear some sound when using -acodec wmav1 or -acodec  
wmav2 when the file is played in Windows Media Player, but the sound  
is very distorded. Still no sound when using -acodec copy


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