Complete rain sequence on a pure black background: rain starts (0-2s), steady heavy rain (2-7.5s), rain stops (7.5-10s). To extend the duration or create a loop, cut within the steady 2-7.5s section - the rainfall intensity is constant there, so cuts are practically invisible. Overlay with Screen or Add blend mode. 4K UHD 3840x2160, 30fps.