The Blender Foundation (creators of the 3D software) publishes high-quality, open-licensed films like Tears of Steel , Cosmos Laundromat , and Sintel .
Search for “stock footage MP4” then sort by size. Double-check licenses (most are CC or Public Domain).
When testing a download or a display screen, you want a video that pushes the limits. A story about a storm at night with water, glass, and textures is the ultimate stress test. If the download is corrupted, the video will pixelate during the rain scenes. If the screen has poor contrast, the dark storm will look like a black blob.