I was looking for a way to change the video frame rate from a video that was 15fps and I needed it to be at 30 fps to be in sync to do video editing on Blender
This tip worked fine:
$ mkvmerge --default-duration 0:12fps --fix-bitstream-timing-information 0 original-video.mp4 -o temp-video.mkv
$ ffmpeg -i temp-video.mkv -c:v copy slow-video.mp4
Source: https://superuser.com/questions/320045/change-the-frame-rate-of-an-mp4-video-with-ffmpeg
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