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
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