It is often part of the Ultra Video Group (UVG) Dataset , a widely used collection of 4K sequences for evaluating video coding and processing performance.
Super-resolution, video denoising, and H.265/HEVC/VVC codec testing. sky4k.mp4
The subtle movement of clouds allows researchers to test how well their models handle temporal consistency (keeping the video smooth across frames). Key Technical Details Resolution: It is often part of the Ultra Video