Thanks for you advice. I was able to get a resized video with acceptable quality.
But now I've encountered another problem. This video, call it A is at 23.97 fps. I want to append it to another video, B, but B is 29.97 fps. A test resulted in the second part of the combined video to be unviewable. MKVmux also said the "private data" of the 2 video streams didn't match.
What can I do to change video A from 23.97 to 29.97 fps?
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