I definitely ticked remote log, maybe it was recorded under my email address instead of username which was recently added. I can PM you the email address if that would be helpful.
No luck with mkclean, same results. However, I did a lot of variations and testing with composing the .mkv files and I think I have narrowed down a potential cause: presence of an English “Forced” PGS subtitle stream.
Note that I have subtitles turned off for the title [Playback Settings/Streams/Subtitles/None]. The issue persists regardless of “Roku Captions Mode” setting and “Burn Subtitles” setting for the app. When I force subtitles on, they are burned in via transcode (expected behavior for PGS) and playback works.
I recreated the mkv files with many different combinations of audio and subtitle tracks, and when I removed the Forced PGS subtitle stream from the container, I no longer experience the issue.
So somewhere in the Roku player, it’s running into the “Forced” PGS subtitle stream in the mkv shortly after the title has started, and even with subtitles turned off it seizes up and stops playback. In this light, the above logs make a little more sense. The seize does not appear to have any correspondence to where actual forced subtitles would appear.
