Hi,
Currently I know that the Apple TV does not support HLG HDR.
However is there a way for the HLG to be converted to standard HDR?
I have a HLG source which seems to be converted to SDR and plays correctly.
YouTube seems to convert HLG HDR to HDR.
Is there a way for the same to happen in the channels app?
Bumping this thread to see if there might be a possibility of getting this to work. Infuse is able to convert HLG files to HDR on the latest AppleTVs (see release notes for 7.5.2). Any chance that we might be able to get Channels to do the same? Currently HLG content (e.g. BBC video files) will play correctly as SDR, but not HDR.
To add to this, I’ve recored HLG content in channels and played it back in infuse where it plays back as HDR.
In channels it plays as SDR
Can you guys describe where you recorded content with HLG?
Or where you sourced it?
Apple TV did add HLG support, and I thought it was the HDR format that was broadcast on things like Fox Sports’ 4K channel on FIOS, which does work in Channels.
If watching live, you’ll need to enable Match Content for Live TV in Channels settings.
I have some BBC content (specifically Planet Earth 3) that’s in 4K with HLG. I can’t be sure where it was originally sourced from. It correctly plays in HDR using the Channels app on my iPhone (though it doesn’t get a badge for HDR).
So on the AppleTV it does show within the Channels app that it is HLG, including in the stats screen; however, it does not trigger the HDR mode on the TV. Other HDR files (non-HLG) do present correctly when played the same way through Channels.
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Could you try playing your HLG content with the latest TestFlight beta?
A new 4K HDR HLG live channel has been added in italy DTT channels, match content is on and i noticed that my sony tv switches in dolby vision mode instead of standard HDR HLG mode.
This causes random image flashing and brightness changes maybe because it's not using the right color space and it's not using the right HDR mode.
I have a hdhomerun standalone app, I can’t make recordings.
I tried to lock the tv on the standard HDR mode and the flashing does not happen, but under standard settings it switches to Dolby vision mode
Here are the full stats of the glitching channel, it's a dvbt2 hevc channel running on 4k hlg hdr making the tv switch in dolby vision mode instead of standard hdr.
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If you need something else to figure out the issue, i can send some screens about the apple tv or the tv video settings 
