When I needed something remotely similar on Windows, I picked Media Foundation and Direct3D 11. This way the video stayed in VRAM on GPU, I could write arbitrar

When I needed something remotely similar on Windows, I picked Media Foundation and Direct3D 11. This way the video stayed in VRAM on GPU, I could write arbitrarily complex processing code in HLSL, and the processing consumed very few resources. Was also simple to render the video if needed. I wonder about ffmpeg architecture, does it run these graphs completely on CPU, completely on GPU, or does it send the video between them?