[FFmpeg-user] Increase video speed via framerate change?

[thljcl]

-r as an output option will duplicate or drop frames to achieve the target
frame rate without changing video length; there is still a change of video
length, despite could be very small, due to round-off error. -r as an input
option will tell ffmpeg to ignore the original frame rate stored in the
video container, thus changing the video playback speed as well as video
length.
Generally, -vf "fps=24" is favored over -r "24" as an output option because
of the predictability. For input option though, "-r" is still pretty useful.




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