I don't understand what the problem is at all, not even after reading what you wrote on IRC. Speculating, though: if the issue is that the video doesn't update often enough on static scenes to refresh the subtitles properly with some renderers and enforcing a sane-ish minimum frame duration isn't an option for some reason (it should be, long sequences of identical frames are essentially free in h264), you're far enough up special snowflake creek that you're gonna have to write some custom tooling to get the job done. I'd suggest a script that parses the timecodes and subtitles files and ensures that coded frames exist at the points where the subtitles are supposed to change.
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