Several reputable sites host legal, free-to-download clips specifically for calibration:
Looking for the best 4K HDR sample files in MKV format? These carefully selected clips are perfect for testing your TV, monitor, or projector’s HDR performance—including brightness, contrast, color accuracy, and local dimming. 4k hdr sample mkv best
: Offers a clean library of promotional clips from major manufacturers (Sony, Samsung, LG). Clips like "The World In HDR" are perfect for checking color saturation and peak brightness. MakeMKV Forums Several reputable sites host legal