I have an odd issue in which MKV muxed from a MP4 is not playing at the intended 60FPS. The source is from a recording of a game which plays fine from the MP4 container, but I get lots of repeated frames and a reported average video rate of 39.9Hz based on the
renderer overlay. I am using MPDN 2.49.0.3606 and the latest version of MKVToolNix to mux.
Any ideas as to what might be going on? YouTube was able to render a video upload at 60FPS with the same MKV file so I am guessing the muxing isn't causing a problem with playback.