I have tested playback of HLG stream on NEW Apple TV 4K.
HLS stream with VIDEO-RANGE=HLG in #EXT-X-STREAM-INFO.
ffprobe color params of this stream was: bt2020nc/bt2020/arib-std-b67
arib-std-b67 is color transfer function used for HLG.
Playback HUD on AppleTV shows video-range HLG, but display switches to HDR10, and display video-range was HDR10.
I think it's normal, AppleTV converting HLG to HDR10, because HLG over HDMI is not supporting
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