GPU powered video crop exists?

General Discussion
1

Hi everyone,

I’m building a C++ video matrix application using GStreamer. I need to crop up to 16 video streams (4K) from capture cards. To keep performance good, I wanted to do the cropping entirely on the GPU instead of using videocrop, which eats up CPU like crazy (70% cpu usage while gpu usage just 15%).

I asked around and recommended using either:

  1. d3d12compositor with xpos/ypos/width/height on sink pads, but those are for positioning, not cropping.

  2. d3d12convert with crop-left, crop-right, etc., but those properties don’t exist in my GStreamer build.

Running gst-inspect-1.0 d3d12convert doesn’t show any cropping-related properties at all. So I’m stuck with videocrop for now, but at 4K it’s maxing out my CPU.

Has anyone actually gotten GPU cropping working with d3d12convert?

2

Instead of exposing the crop-XYZ properties, d3d12convert performs cropping based on crop meta attached to input buffers.

If you configure your pipeline like d3d12upload ! videocrop left=WANTED-XPOS ! d3d12convert` or so, videocrop will attach crop meta (instead of actual cropping on CPU), and d3d12convert will perform the actual cropping using crop meta attached by videocrop