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... and forward colorimetry to downstream. The Colour element describes various color information (similar to 'colr' box in isobmff). Note that, due to the comparatively limited syntax for color information in vpx codecs, the color information in mkv/wemb container level should be used for sophisticated color handling (e.g., HDR video). https://bugzilla.gnome.org/show_bug.cgi?id=790023
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