Opened 15 years ago
Last modified 15 years ago
#1416 new defect
asf mencoder a-v sync problem
| Reported by: | Owned by: | reimar | |
|---|---|---|---|
| Priority: | normal | Component: | core |
| Version: | HEAD | Severity: | normal |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: | ||
| Reproduced by developer: | no | Analyzed by developer: | no |
Description
The file WMV3/WMA2 can be played with libavcodec without problems but can't me re-encoded (AV sync problem):
/tmp/mplayer-checkout-2009-02-24/mencoder -ovc lavc -oac lavc -lavcopts vcodec=mpeg4:acodec=ac3:abitrate=128 -o x.avi -vf scale=640:-11,harddup bad.wmv -ofps 30 -frames 250
When I change -oac lavc to -oac copy then it is ok. With -oac lavc
no combination of harddup,-mc x,-noskip works for me.
I looked into ASF, it has 33ms between video chunks, but audio
is interspersed at each ... say .. 400ms at different object
timestamps (than video is).
I uploaded it to the upload FTP as file devik_asf_encode_av.wmv
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I found that I can solve it by -of lavf. Thus avformat's AVI works, while mencoder's mpformat doesn't. I also compared resulting AVIs, there are a few differences in headers.