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Though I prefer to burn in subtitles with Handbrake for foreign parts of films, if I want subtitles in the language I am watching (usually because of hearing issues - too many movies now have actors without the ability to project their voices), I download subtitles. These are text files usually with...

This is not exactly what you are asking about, but... To handle subtitles, I don't bother burning them in. Instead, I download a subtitle file (there's a few sites which have them, I use https://subscene.com). As long as the subtitle file has the same name (not extension, subtitle will be srt) and c...