HDR10+ is a High Dynamic Range video technology that adds dynamic metadata to HDR10source files. HDR10+ signals the dynamic range and scene characteristics on a scene-by-scene or even frame-by-frame basis. The display device then uses the dynamic metadata to apply an appropriate tone map through the process of dynamic tone mapping. Dynamic tone mapping differs from static tone mapping by applying a different tone curve from scene-to-scene rather than use a single tone curve for an entire video. HDR10+ is the default variant of dynamic metadata as part of the HDMI 2.1 standard.
Workflow and ecosystem
HDR10+ utilizes an HDR10 master file within existing and distribution workflows. The HDR10+ ecosystem is used within current systems by,
embedding HDR10+ metadata into HDR10 encoded content
distribution through digital stream
displaying HDR10+ content on a capable display and mobile devices
Metadata generation
For offline and Video-On-Demand , Multi-Channel Video Programming Distributor ), HDR10+ Metadata may be created during the post-production, mastering process or during transcoding/encoding for distribution back-ends by HDR10+ content generation tools in two steps,
Identifying scene cuts, and
Performing an image analysis on each scene or frame to derive statistics
HDR10+ metadata is interchanged through a low complexity JSON-structured text file, which is then parsed and injected into video files.
Live encoding
Live use cases are possible by delivering HDR10+ metadata in every frame. HEVC encoders on live content and mobile phones record video and create HDR10+ metadata in real-time during recording. Live encoding is detailed in the Live Encoder Workflow diagram and real time broadcast operations are supported at the point of transmission enabling a metadata-less broadcast operation.
Compatibility
HDR10+ metadata follows ITU-T T.35 and can co-exist with other HDR metadata such as HDR10 static metadata that makes HDR10+ content backward compatible with non-HDR10+ TVs. HDR10+ metadata is ignored by devices that do not support the format and video is played back in HDR10.
Maximum linearized pixel value: 10,000 cd/m2 for each color R/G/B
Metadata : Mastering Display Color Volume Metadata
Metadata : MaxCLL, MaxFALL
HDR10+ technology can support the full range of HDR standards to 10,000 cd/m2, 8K and BT.2020 color gamut. Being resolution agnostic, metadata needs to be created only once and can be applied to any target resolution. HDR10+ is applicable for HEVC and VP9 compatibility via WebM as well as any codec that supports ITU-T T.35 metadata.
Administration
HDR10+ Technologies, LLC administers the license and certification program for products that want to adopt HDR10+. HDR10+ Technologies, LLC provides the technical specifications, test specifications, and certified logo.
