It seems like you're facing pixelation issues primarily on Nvidia cards when using VLC and MPC, which do not occur when using WMP11. This problem has been persistent since the original Release Candidate (RC) release. Here are some insights and potential solutions to this problem:
Causes of Pixelation Issues:
- DirectX vs. OpenGL: The problem might be related to the way VLC and MPC interact with the graphics rendering APIs, DirectX and OpenGL. It appears that OpenGL works fine, while DirectX causes pixelation.
Possible Solutions:
- Switching to OpenGL: Since you mentioned that the issue is resolved when using OpenGL, you might want to consider switching the rendering mode in VLC and MPC to OpenGL: