Dolby Vision supplements the HDR data already present in a video. For example, when you buy a Blu-ray disc that supports Dolby Vision, the disc contains several

Dolby Vision supplements the HDR data already present in a video. For example, when you buy a Blu-ray disc that supports Dolby Vision, the disc contains several m2ts files containing HEVC encoded videos. Present within the HEVC stream is also the metadata, which supplies metadata for each frame. To see what this data is, I used[1], and then got the info for frame 1000 and saved it as a json in this [2] pastebin. As you can see, it contains info regarding the minimum and maximum PQ encoded values, the coefficients of the ycc to rgb matrix, among other things. This allows TVs to better display the HDR data, as currently, video data encoded using rec. 2020 color primaries with max light level of 10000 nits is far outside what current TVs are capable of displaying, so metadata showing max pq of a frame or scene allows these devices to make better decisions. [1] https://forum.doom9.org/showthread.php?t=183479 https://forum.doom9.org/showthread.php?t=183479 [2] https://pastebin.com/m5NfUTbc https://pastebin.com/m5NfUTbc