New answers tagged subtitles
The only way to do it with literally zero mathematical quality loss is to make a gigantic output file with a lossless codec. (e.g. utvideo, FFV1, or x264 in lossless mode (--qp 0). A better solutions that would achieve the same thing is: mux the subtitle file into the mkv, with mkvmerge. You set a flag so it either plays by default or doesn't. Then you'd ...
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