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I post this in case it helps someone.
I had an file that was an odd framerate. 20 FPS. When I used virtdub to adjust it to 23.976, you could see the increased speed and it was disconcerting.
What I ended up doing was firing up AVIsynth and using the ConvertFPS(23.976). This command keeps the film length intact and basically 'generates' duplicates of frames to keep the file playback timing all in sync. To use it, you'll need to convert to YuY2 if its not already.
For files that were slightly off... say 23.973 or close ... its easier to allow the Vdub to mod the header and change the playback framerate... make sure you either leave the audio stream on the file prior to your edits or it will cause a sync problem afterwards if your doing any other edits.
I had an file that was an odd framerate. 20 FPS. When I used virtdub to adjust it to 23.976, you could see the increased speed and it was disconcerting.
What I ended up doing was firing up AVIsynth and using the ConvertFPS(23.976). This command keeps the film length intact and basically 'generates' duplicates of frames to keep the file playback timing all in sync. To use it, you'll need to convert to YuY2 if its not already.
For files that were slightly off... say 23.973 or close ... its easier to allow the Vdub to mod the header and change the playback framerate... make sure you either leave the audio stream on the file prior to your edits or it will cause a sync problem afterwards if your doing any other edits.
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