Is it possible to provide a Codec ID as a mapping for mp4ra registered codecs?

[liyuxi]

It is foreseeable that many newer standardized codec will be registered in mp4ra first (like v3c?), and doing so will also be backward compatible with the legacy codec supported by QuickTime 7 and the previous. This can be used as a mitigation measure for some encodings that were carried over before Matroska was standardized.

[robUx4]

Isn't that covered by https://www.ietf.org/archive/id/draft-ietf-cellar-codec-14.html#name-v_quicktime ?

[liyuxi]

Isn't that covered by https://www.ietf.org/archive/id/draft-ietf-cellar-codec-14.html#name-v_quicktime ?

However, its description is more inclined to be understood as the legacy coding format supported by QuickTime, rather than containing new codec recognition for mp4ra registration.

[robUx4]

Yes, because the idea is to have proper mapping for each codec, using all the features available in Matroska. Not a wrapper of other codecs. For example you can put H264 as a Quicktime codec in Matroska, but noone is doing that (and it will likely not play in many places).