add item_type entries from ISO/IEC 23008-12:2022

[bradh]

No description provided.

[podborski]

Thanks. I think there are more missing 4CCs. For example:

• 'mskC'
• 'vvcC'
• 'evcC'

[bradh]

Thanks. I think there are more missing 4CCs. For example:

* 'mskC'

* 'vvcC'

* 'evcC'

That is a valid criticism. I was very focused on the rgan item type, and just threw in the others because they were there (and removed 'uri ' because it flunked the CI check).

Do you know of a summary document for HEIF ed 1 to ed 2?

[bradh]

@podborski Did you have additional review comments on this?

[podborski]

@podborski Did you have additional review comments on this?

I'll review. Didn't have time to do it yet. Just briefly looked at it seems like some CMAF updates are also added. It would be good to split into 2 PRs as this one seems to address HEIF. Or, alternatively rename this PR to reflect that it also updates CMAF.

[bradh]

I don't think I pulled in anything from CMAF - I don't think I actually have a copy of that.

[bradh]

Oh, I see why it looks like it has CMAF updates. I've put a few entries that were at the end of the brands file that were out of alphabetical order into order, and those were CMAF related.