How do I change the subtitle color of an mkv video on a Mac?
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Start by telling the format of the subtitles and what program is used for playing the video.
I'm not a MAC user so I'm afraid the only way I can think of is somewhat cumbersome.
If you don't already have it install MKVToolnix. Assuming your video has a video-, audio- and subtitle track extract the idx/vobsub with
mkvextract tracks color.mkv 2:test.srt
[Attachment 46916 - Click to enlarge]
Else you need to edit the color palette
[Attachment 46917 - Click to enlarge]
This may involve some trial and error. The color palette has 16 entries of which 4 is used in the subtitle: BG Background (often transparent), TXT (which I ussume is the one you want to change), OUT outline often black, ANT antialiasing often grey if used.
[Attachment 46918 - Click to enlarge]
Unfortunately there are no rules for how these colors are mapped to the palette but it is most often the first 4 entries.
If you have access to a Windows PC you could use BDSup2Sub++ to visually edit the colors in the idx/vobsub.
After editing mux the video with the new idx/vobsub using MKVToolnix GUI.
Thanks a lot, videobruger. I'll definitely give your method a try.