Create subtitles
- Add Thai subtitles for Kodi is explained in Kodi 19 Matrix, Enable Thai subtitles for srt, ssa and ass subtitle files.
- Embed fonts into mkv with ffmpeg (explained here):
/path/to/ffmpeg.exe -i input.mkv -map 0 -c copy -attach font1.ttf -attach font2.ttf -metadata:s:t:0 mimetype=application/x-truetype-font -metadata:s:t:1 mimetype=application/x-truetype-font output.mkv