I have a video with the following mediainfo:
Title 1080p H264
Codec H264
Profile High
Level 50
Resolution 1448x1080
Aspect Ratio 181:135
Interlaced No
Framerate 29.97
Bitrate 45 mbps
Bit Depth 8 bit
Pixel Format yuv420p
Reference Frames 1
Emby correctly detects it as 1080p in the episode viewer.
But there are no 1080p quality options in the quality selector.
playback logs.txt