[rwxsh]

> Project leaders from Ffmpeg, Google, Mozilla, Microsoft (and probably Nvidia and AMD) need to all get together and decide on a single method.

Speaking non-officially as a browser implementer, VUI isn't always reliable as a source of color, both because the encoders don't always know, and the decoders don't always extract it reliably. The container is a more reliable place to put it (eg. MP4 'colr' box).

Browsers do differ in behavior when these sources of metadata differ. It currently looks likely that WebCodecs will require implementations to use app-provided color metadata over in-band metadata, which would be good for interoperability!

[Daemon404]

This is one place the ISOBMFF spec really screwed up, in my opinion. They should have included semantics for the colr box, i.e. which takes precedence.

Intead we get: "Colour information may be supplied in one or more ColourInformationBoxes placed in a VisualSampleEntry. These should be placed in order in the sample entry starting with the most accurate (and potentially the most difficult to process), in progression to the least. These are advisory and concern rendering and colour conversion, and there is no normative behaviour associated with them; a reader may choose to use the most suitable."