VideoSEIMessage

This SEI message only takes the payload type and the sum of the payload sizes for all SEI messages of this type. More informations, such as timestamp, payload, may be added in the future.

VideoFileContentLightLevel

A message holding the equivalent of the content light level information in HEVC or its representation in matroska/webm. This gives coarse stats on the luminance levels in the content and may be used as a hint by algorithms & displays to tone map.