The cause of the problem seems to be that I am losing more frames when capturing large HD frames.Įncoding captured clip to mp4: ffmpeg -ss 3.25 -i input.avi -map 0:0 -map 0:1 -threads 0 -c:v libx264 -profile:v main \ The duration is 19:06, shorter than the original 22:47 (confirmed by mediainfo) Virtualdub and mpc and potplayer play the captured file apparently too fast, but with the right audio pitch in the first 3-4 min, but high pitch in the rest of the video. I am using Virtualdub with VHScrCap driver for capture. I captured the video in avi with Ut Video Lossless Codec at 29.97 fps, with pcm 16 bit unsigned audio.
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