I tried to author a much more elaborate response, but it got rejected as spam for some unknown reason.
I’ll try to be brief. I used mkvmerge as well. I’m aware of the fps issue and MediaInfo shows 23.976. On top of that, seeking into the movie works, so it would seem to me that the audio and video are interleaved correctly.
At any rate, I’ve got other ideas to try, and when I get a chance I’ll try those ideas and some of the ones suggested here.
