Rmteam X265 Today
A: Occasionally, but they are not a primary 4K group. For 4K x265, look for TERMiNAL , EPSiLON , or FraMeSToR (larger sizes, higher quality).
A: You are playing an HDR10 version (10-bit color) on a non-HDR display with broken decoding. Use 8-bit versions (less common) or update your player (MPV handles HDR→SDR conversion best). Rmteam X265
(free tool): Right-click MKV → MediaInfo → View → Text. A: Occasionally, but they are not a primary 4K group