Am 24.03.2024 um 23:30 schrieb Bo Berglund:
But is it possible also to modify an mp4 video file to *play* faster/slower than
original while keeping the accompanying audio pitch the same?

It's possible to change audio length, sample rate and pitch, and also all combinations of these three parameters.
See chapter 3.7 in my book:
http://www.astro-electronic.de/FFmpeg_Book.pdf

Michael

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