The FATE suite already contains a file containing mastering display and content light level metadata: Meridian-Apple_ProResProxy-HDR10.mxf This file is used to test both the Matroska muxer and demuxer. Reviewed-by: Ridley Combs <rcombs@rcombs.me> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>