Thanks for reaching out to us.
We have a dedicated forum for Intel Integrated Performance Primitives(IPP), so we are moving this thread to the IPP forum.
Please give us more details about your problem. The context of your problem is not quite clear to us, please elaborate on your problem so that we can help you in a better way.
The Color Model Conversion API of current version IPP not support ITU-R BT.2020 Color Model, that is used in UHD video just like ITU-R BT.709 in HD Video .
I use ippiColorTwist32f* to convert UHD video Image, but got poor perfromance .
BTW , could add YCbCr444to422 / CbYCr444to422 API ?