MC has problem displaying ASS … this been issue for a loooooong time
For first case … subtitle in question has no line breaks … but ASS header specifies [WrapStyle: 0] which is [smart wrapping, lines are evenly broken] … VLC respects WrapStyle … MC ignores it
For second case … its one of the biggest issue - if there are multiple items on the screen, MC does not respect format specified for each item … so those items are all over the place (except the last item that appears) … as new items are added/removed from screen, all previous item on screen change to new format/positions … so things jump a lot around the screen if there are lots of items on screen at same time making it super annoying
Also lots of ASS(SSA 4.0+ … subsequent versions are not standardized and have lots of branching, so can ignore those) features are not supported (karaoke, text rotation, transparency etc)
This is probably the last frontier MC is lagging behind other media players (Kodi, VLC, MPC-HC, Plex all display them correctly) … making MC pretty much useless if you into anime (I use MPC-HC when I need to watch my anime)
Its been said JRiver team will look into this … but so far no news if this will be corrected in MC25
PS. I volunteer to be tester if one is needed