The instructions and sample command lines are on the webpage You can use mp4fpsmod to extract and mux back in timecodes, but it's all commandline (There is no GUI).
The timecodes tell the player where to slow down or speed up in sections as the FPS varies down and up over sections When you mux back in the timecodes, it will become VFR and magically back in sync. If you're just rotating it without other edits, you need to extract timecodes, rotate the video (this requires re-encoding, you can even take the out of sync video you exported from an editor if you made no edits besides rotating), then mux back in timecodes. There is no "easy" way to do this - It will probably be easier for you just to rotate the video with playback software (during playback)
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