Note that Blu-ray and MKV work differently. On a Blu-ray subtitlines lines are marked forced. So you can have a single track with forced and non-forced lines. But in mkv tracks get a forced flag (or not). To make it even more complicated, the forced line flags may be kept in mkv for certain formats (namely DVD style idx/sub and Blu-ray style sup/pgs). Some players (LAV Splitter) can be set up to make use of both depending on what the user wants. I don't know how Kodi works but most players seem to look at the track flags of the mkv container. For those players a work-around is to duplicate the subtitle track (but only keeping the forced lines for the duplicate) so you have two tracks. Or hardcoding the forced lines but not the non-forced ones.
(Not all Blu-rays are authored to use forced line flags. Some use multiple tracks similar to mkv but without any flags.)
Last edited by sneaker_ger; 24th August 2017 at 21:40.
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