Hi, We currently deliver HDR10+ content within a composite HLS stream where Dolby Vision is signaled as a supplemental codec alongside HDR10+. Our testing on Apple TV 4K (3rd generation) indicates that playback succeeds, but we have not found a reliable way to determine whether playback is occurring in Dolby Vision or HDR10+ mode when connected to a display that supports both formats. We have also verified that the same stream plays correctly on displays that support HDR10+ but do not support Dolby Vision. However, on displays that support both HDR10+ and Dolby Vision, we are unable to determine which dynamic range format AVPlayer ultimately selects. Is there a recommended Apple API or mechanism to determine whether AVPlayer is rendering content as HDR10+, Dolby Vision, or another HDR format at runtime? For reference, below is an example variant from our master playlist: #EXT-X-STREAM-INF:BANDWIDTH=2851276,AVERAGE-BANDWIDTH=2030750,CODECS="hvc1.2.4.L90.90,mp4a.40.2",SUPPLEMENTAL-CODECS="dvh1.08.01/dv1p,hvc1.2.4.L90.90/cdm4",RESOLUTION=854x480,FRAME-RATE=24,VIDEO-RANGE=PQ,HDCP-LEVEL=TYPE-1,CHARACTERISTICS="com.dss.cbcs.hdr.hd",AUDIO="aac-128k",SUBTITLES="sub-main" Specifically, we would like to understand: How AVPlayer chooses between Dolby Vision and HDR10+ when both are available in the same variant. Whether there is a supported way to determine the selected HDR format during playback. Whether any other APIs expose this information. Any guidance would be greatly appreciated. Thank you.