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CDNWiki - Mencoder Commands
https://wiki.cyberleo.net/wiki/MencoderCommands#:~:text=If%20%27Skipping%20frame%21%27%20or%20%271%20duplicate%20frame%20%28s%29%21%27,outgoing%20framerate%2C%20so%20try%20a%20higher%20source%20fps.
[MPlayer-users] Audio sync problem with mencoder
https://groups.google.com/g/mplayer_users/c/2kb7bEHOMkQ
- don't use oac -copy, instead of this reencode both, video and(!) audio With this, I get some duplicate frames or frame dropping messages especially at the beginning especially when using ts Streams with h264 video as input files, but the result is fine overall and the audio and video is in sync.
CDNWiki - Mencoder Commands
https://wiki.cyberleo.net/wiki/MencoderCommands
If 'Skipping frame!' or '1 duplicate frame(s)!' warnings occur repeatedly, and the resultant audio grows out of sync (as if one is faster) then try tweaking the source framerate. 'skipping frame' means there's too many frames coming in, so try a lower fps. 'duplicate frame' means there isn't enough frames coming in to satisfy the outgoing framerate, so try a higher …
[MEncoder-users] MEncoder skips duplicate frames even with ...
https://mencoder-users.mplayerhq.narkive.com/f3jEAKxP/mencoder-skips-duplicate-frames-even-with-vf-harddup-and-noskip
1. mencoder in.mp4 -of rawaudio -oac mp3lame -ovc copy -mc 0 -noskip -o out.mp3 2. mencoder -vf harddup -mc 0 -noskip -ovc copy -oac mp3lame -lameopts cbr:br=128 in.mp4 -o out.avi 3. mencoder -vf harddup -noskip -ffourcc XVID -ovc xvid -xvidencopts bitrate=700:bvhq=1 -oac mp3lame -lameopts cbr:br=128 in.mp4 -o out.avi
Using mencoder to clip avi files results in audio sync ...
https://forum.videohelp.com/threads/358835-Using-mencoder-to-clip-avi-files-results-in-audio-sync-issue
Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 32000 Hz, 2 ch, s16le, 1024.0 kbit/100.00% (ratio: 128000->128000) Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) ===== ===== videocodec: framecopy (720x480 0bpp fourcc=64737664)
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