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2

MKV does not store a frame rate in its container. So ffmpeg/vlc looks at the default duration of a frame instead. It sees 33.333ms and does the math, which is where your weird number comes from. Source: https://github.com/mbunkus/mkvtoolnix/wiki/Wrong-frame-rate-displayed To test this out, you can run ffprobe with -show_frames. I think you'll find the ...


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Between frame is frame gap. In there, camera don't expose and coresponse it can not receive data at frame gap. And i think, frame_readout include frame gap (time between frame adjacent)


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You can use ffmpeg, a free command-line tool, to do this: ffmpeg -i in.mp4 -vf "select=not(mod(n\,30)),setpts=N/FRAME_RATE/TB" -r 30 out.mp4 -vf specifies a video filterchain i.e. a sequence of filters applied to a single input. select=not(mod(n\,30)) - this filter keeps only each 30th frame from the source. FFmpeg works primarily within the framework ...



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