For an output format like MP4, which defaults to constant frame rate (CFR), -r will generate a CFR stream.The -r logic depends on the video sync method set ( -vsync).-r takes effect after all filtering, but before encoding of the video stream has taken place.There are differences in implementation of those two: With the -r option used as an output option.There are two ways to change the output frame rate: If you are interested in keeping the number of frames, but squeezing / stretching the video, see: How to speed up / slow down a video How to change the frame rate Please look at the respective encoding guides for the codec you've chosen. Without setting appropriate output quality or bit rate, the video quality may be degraded. Note: Changing frame rates requires the video to be re-encoded.
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