I have the R1 DVDs of ST: DS9, and I’ve just looked at a few episodes via their mkv backups (which have had no post-processing applied) and noticed the following behaviour: playback starts with a framerate of 29.97 according to the playback stats, and then at some point, it switches to 30. At that point I get picture and sound dropout as my TV adjusts. On some episodes, the initial framerate is 59.94, but then it switches to 60, again causing a second or two of interrupted playback. I have seen the same behaviour on a LibreELEC Pi with MMAL playback.
I know these episodes are tricky due to the combination of standards-converted film with video effects, but ideally, playback would be at a fixed 29.97 or 59.94 rate. Perhaps this is a disc authoring issue and I’m stuck with this? Just wondered if anyone has had any success in playing this type of source or has any suggestions. Thanks.