VFX workflow using S-gamut3.cine/S-log3

I don't think you can select s-gamut or s-gamut cine as export colorspaces. only rec. 709, rec. 2020 and P3, afaik.

also, the best quality would be Open EXR at 16 bit as it automatically converts it to linear working space. Prores stores all values in Rec. 709 non-linear.

Jpeg2000 can store Rec. 2020.

and I believe DPX's spec requires they be stored in bypass RGB.

In after effects, you can use the OCIO plugin for ACES support, but Premere is gonna be a little tricky if you dynamic link anything, it will force  rec. 709 (unless somethings changed about that)

You probably got a 1-2-1 flag for NCLC mismatch. It happens all the time.

BBC - "Several post-production tools and utilities are now aware of the colour and transfer function parameters specified. However, some tools are unable to correctly signal the correct parameters, and may result in a file with the incorrect video parameters. "

edit metadata:

https://github.com/bbc/qtff-parameter-editor

https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html?fbclid=IwAR07grA7Xg-fd9qGZerC7hRSlyuYb5y11gzSDsmcfv9M889jVqx8aqWrWfQ#//apple_ref/doc/u
id/TP40000939-CH205-74522

NCLC tags cheat sheet.
https://drive.google.com/file/d/1mvDCUCXcKvhg-A2hfsoAna4cBu7kzZYC/view?fbclid=IwAR2f6q7LxiLe3lJGgem1kjF8gaoX7-mVK27Yaq0ZYjQ4iMtja7nPtaZtggM

What are the rejections ... a QC machine, what? Anything listed as the reason for rejection?

By saying you are trying to use ProRes 4444, is that what you're trying to export into?

If so, make sure that your Sequence settings have Maximum Bit Depth checked, as well as your Export dialog. Then in the Export dialog, scroll down, check Render at Maximum Depth, and in the drop-down, select either 16-bpc or 16-bpc + alpha, depending on whether you are exporting an alpha channel also.

Neil