www.makemkv.com

Thank you for pointing me into this area. I have a registered / paid version of MakeMKV, I had internet access enabled. I had not had any troubles with any disc before. I would never have assumed there was a problem at my end...Now I enabled the extended log info. I found "DEBUG: Code 0 at wOav...

dump for uhd 4k MKB20_v77_Transformers-_Rise_of_the_Beasts_92D0 send
thnx for adding

only answer to one part, but i use .mkv and for appletv the app - infuse: https://firecore.com/infuse
infuse can play a lot of file types

instead of plex i use jellyfin: https://jellyfin.org/

Just sent the MKB20_v77_The_Flash_BC6E
hope you can add it.