In the past, YouTube added product features and made new video and audio formats available to everyone, from HD to 4K video, live streaming, 3D, 360-degree video, and spatial audio. And now it is adding support for High Dynamic Range (HDR) videos. Users can watch YouTube videos in HDR on supported devices, such as HDR TVs with the new Chromecast Ultra streaming device, and soon on all 2016 Samsung SUHD and UHD TVs. Any creator can now upload HDR videos to YouTube. As for authoring HDR content, Blackmagic's DaVinci Resolve software, version 12.5.2 or newer, is currently the only software that exports files with (some) standards-compliant metadata out of the box.
To take advantage of this:
This container and codec doesn't yet support all metadata. It specifies primaries, transfer characteristics, and matrix coefficients, but doesn't provide mastering display metadata. 