For OLED subtitle in black bar no blooming issue in HDR but still too bright if subtitle is in white color.

Lucky player I use can choose Light Grey for subtitle and this will eliminate the issue.

I using Infuse Pro in my Apple TV 4K, the most customizable subtitle apps I ever found.

I don't play KODI, that thing is troublesome in every platform and I never like it.

Infuse Pro is for personal collection movies. I use together with Plex where Plex as database catalog.

I REMUX all my Blu-ray collection, too lazy to insert disc already nowadays. Once you get use to browse directly, you would never want to insert disc.

For 4K Blu-ray player, I use Panasonic DMP-UB400 UltraHD Blu-ray. I can't REMUX myself 4K yet as I don't have 4K Blu-ray drive for PC.

Actually all mentioned in my signature. If you view from mobile, you need to choose desktop mode just can seen. Haha!