HEVC movies incorrectly playback in HDR on 2020 Roku Ultra

[granjan7]

Check out this thread. By removing a few elements from MKV files and forcing Direct Play the colors now look correct.

Roku Ultra 2020, aka 4800x, direct play, colors distorted when playing back HEVC, 1080p content on 1080p screen. Applies to both 8-bit and 10-bit packaging of 8-bit content

Every bit of code has cost. Maybe Plex will make a change, but it’s so obviously a Roku bug that it’s hard not to suggest pressuring them. Yeah. The Plex Transcoder is derived from FFmpeg. But if you replace it with a baseline ffmpeg a variety of things don’t work. Some folks have created wrappers around the Plex Transcoder, but I think that would be more difficult here. I don’t think ffmpeg exposes any knobs to control behavior of these headers. A wrapper could race to modif…