easySUP use text input, but I want to use non-text graphics (png images) for input, like this:
PNG files to BDN (XML+PNG) or TTML2+PNG (or IDX+SUB or PGS or SUP ?)
So, it looks like I need do these steps:
1) make BDN XML file using avs2bdnxml (or manually make XML in text editor)
http://forum.doom9.org/showthread.php?t=146493
2) import PNG+BDN XML to BDSup2Sub
http://forum.doom9.org/showthread.php?t=145277
3) export to VobSub(SUB+IDX) and/or Blu-Ray-SUP (PGS) from BDSup2Sub
4) mux it to mkv using mkvmerge (PGS and VobSub support listed)
https://mkvtoolnix.download/doc/mkvm...erge.subtitles