Edit MP4 play speed using videoReader/Writer

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Matt J
Matt J 2020-6-20
编辑： Matt J 2022-1-2
I have an MP4 file of a narrated Powerpoint presentation and I would like to edit the file so that it plays back at a higher default speed. I am wondering if there were a way to do this using videoReader and videoWriter. One approach that I was considering was to read in all the frames with videoReader and then re-write the frames to a new file with a higher framerate setting. However, I'm not sure what I would need to do to make sure the audio track is correspondingly accelerated.
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Matt J
Matt J 2020-6-25
Maybe a better question is, does VideoWriter even have the capability to add an audio track to an output MP4 file?

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