[MPlayer-users] WMV Stitching A/V problem

[K Saunders]

> Hi,
> 
> I've been creating a stitched WMV file on the fly.
> 
> After a serious amount of googling I've managed to get the stitching 
> process to work OK. Problem is A/V synch. The audio gradually gets out 
> of synch so that by the end of a 1 minute movie the audio is lagging 
> around 0.5 secs
> 
> Here's the command I'm using
> mencoder 27wmv.wmv 36wmv_captioned.wmv 8wmv.wmv -o test.wmv \
> -ovc lavc -lavcopts vcodec=wmv2 \
> -oac lavc -lavcopts acodec=wmav2 \
> -of lavf \
> -vf harddup -mc 0 -noskip -ofps 25.00
> 
> The output shows around 12 duplicate frames per minute of movie.
> 
> I've tried different combinations of
> -vf harddup
> -mc 0
> -noskip
> 
> Nothing works so far.
> 
> I'm getting this kind of result in the log
> 
> VIDEO:  [WMV3]  720x576  24bpp  1000.000 fps  3082.2 kbps (376.2 kbyte/s)
> [V] filefmt:6  fourcc:0x33564D57  size:720x576  fps:1000.00  ftime:=0.0010
> 
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16002->192000)
> Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg))
> 
> Pos:   0.9s     23f (36%)  0.00fps Trem:   0min   1mb  A-V:0.039 [0:223]
> Pos:   1.0s     24f (36%)  0.00fps Trem:   0min   1mb  A-V:0.043 [0:223]
> Pos:   1.0s     25f (36%)  0.00fps Trem:   0min   1mb  A-V:0.042 [0:224]
> 
> Any suggestions? I'm really stuck on this one.
> 
> Kevin

Never mind, I've given up on mencoder.

I've found something called asfbin which does the job perfectly, no a/v 
problems and really high quality.

It was originally a Windows program but the guy who wrote has posted a 
Linux port which works really well.

The url is
http://www.radioactivepages.com

Hope this manages to save someone the 2 odd days I've spent trying to 
understand how mencoder works

Kevin