2017-07-28, 10:19
Nope. hardcoded is mentioned only as a usage example. Ofcourse you can use this option on all videos and all subtitles (sub/srt). I just made example, because that is what it (seems to me) will be used most for. So no re-encoding anything, just changing the format of subtitles from sub/srt to ssa which supports this formatting (black background).
I don't think opaque (transparency) is supported. Only colored background.
I don't think opaque (transparency) is supported. Only colored background.