dvdsubs are RLE (run length encoded) bitmaps.
It appears that when dvdsubs from SD are encoded into full-HD, the run
lengths are 720-to-1920 scaled and the lines (for NTSC DVDs) are
480-to-1080 scaled. That's great. However, the character bodies in the
resulting dvdsubs are very fat and overrun ea
There is a documentation error -- https://trac.ffmpeg.org/ticket/11678
has been submitted.
dvdsubs can be muxed into mp4, and even 5 year-old players can play the
mp4 and show the subtitles. I suspected this was true because mp4 is
MPEG, but I'd read that the bit-mapped subs have to be burned in.
