

The command I use is: ffmpeg.exe -i Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -c:v copy -an Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4 The reverse (mp4 to mkv) causes no frame rate change. In running ffmpeg -i FILE.mkv -c:v copy FILE.mp4, I expect a pure container switch, and that the frame rate to stay exactly the same. I am trying to convert from MKV to MP4 or MOV with a constant frame rate and the resulting file has a variable frame rate.
