2023-10-24, 11:34 PM 
		
	
	
		I think its because the HDR Format is HLG.  I'm pretty sure i have the same file (Planet Earth 3) and noticed the same thing yesterday.  It direct plays on my LGTV perfectly but when transcoded to H264 i get the dark image like you have here.   This doesn't happen on other DolbyVision/HDR content, i'm using an Arc380 so it seems its happening on multiple hardware.
	
	  
	
	
