Quick search indicates it's likely connected to D3D surface memory 'pitch' (also called 'stride') and the Video Mixing Renderer (from XP & later)

Thank you. Do you have any idea how it might affect things visually?

Kahenraz wrote on 2022-06-17, 11:33:

Thank you. Do you have any idea how it might affect things visually?

Sorry no...seriously outside my comfort zone but, at a guess, maybe some form of toggle to select VMR pitch values over other possible pitch values to avoid / fix some form of screen corruption???

Check this link (and the last para) for more info - https://docs.microsoft.com/en-us/windows/win3 … width-vs--pitch

Thank you, this is very interesting. I have naively thought that the pitch was also the width in bytes. I guess this is a very common misconception. When you access a frame buffer, I hadn't thought about a cache being on the line like that, or even in the same memory allocation.