Support for processing with 3D LUT files - MediaLive

Support for processing with 3D LUT files

You can configure a channel to use a 3D LUT file for conversion. Or you can use the standard MediaLive mechanism for conversion.

You provide a list of 3D LUT files. Each 3D LUT file contains color mapping information for a specific source/output combination. For example, one file contains information for converting Rec. 709 to HDR10.

Using 3D LUT files

These rules apply to using 3D LUT files:

  • Sourcing of 3D LUT files. You must provide the 3D LUT files. MediaLive doesn't have built-in files.

  • One file for each combination. You must provide a file for each source/output combination. For example, a file for converting Rec. 601 to HDR10.

  • Maximum 8 files. You can provide a maximum of 8 files for each channel. This means that MediaLive supports up to 8 source/output conversion combinations.

  • Global application. MediaLive uses a specific file in all the outputs where that file applies. For example, if there is a file to convert Rec. 601 to HDR10, MediaLive uses that file in every output that it applies to. You can't configure some outputs to use the standard mechanism for conversion.

Contents of the 3D LUT files

The following rules apply to the contents of the files:

  • Format. You must make sure that each 3D LUT file follows the .cube 3D LUT format.

  • Maximum one file per combination. You can provide only one 3D LUT file for each combination. You can't configure some outputs to use a different 3D LUT file. When MediaLive reads the list of 3D LUT files, it uses the first file that it finds for a source/output combination.

  • HDR10 luminance. MediaLive supports conversion of HDR10 content with a maximum luminance of 1000 nits to 4000 nits, but it only supports one maximum luminance. When MediaLive reads the list of 3D LUT files, it finds the first file for each conversion from HDR10. Even if you one file for 1000 nits and one for 4000 nits (for example), MediaLive uses only the first file it encounters. Therefore the following guidelines apply:

    • You should make sure that all the HDR10 content in all the inputs in one channel have the same maximum luminance. If a source has a different maximum luminance, MediaLive will convert the content, but the outputs will have sub-optimal luminance.

    • In each 3D LUT file for converting from HDR10, make sure that the luminance handling is appropriate for the luminance of the source.