SOLVED: Direct Play 4K HDR Issues

[theguymadmax]

This is specific to what Jellfin for ATV does. Since I can’t view their code, I can’t tell what they are doing. They might not even have a level check in place; they could simply verify HEVC support and allow playback for any level, or they could hardcode the capabilities for different devices. There could be numerous approaches to handling this.

Regarding your issue, I've tried the workaround, but it doesn't seem to be working. Are you certain it's not still transcoding? I don’t see how disabling HEVC 10 decoding would result in that outcome.