@von Suppé: I think I'll keep the current beta sizes... fits somewhat with what mpv/vlc shows.
About the quality stuff - I cannot see anything here and I cannot see any reason why quality should be changed.
thx about the "margin" settings - was not taken from ASSA, but this should also be fixed in latest beta:
https://github.com/SubtitleEdit/subt...leEditBeta.zip