To help you get the exact video files you need, what (like a PC, Nvidia Shield, or TV USB port) and audio gear are you using? Share public link
This is the largest library for AV test files. The site covers Dolby Digital 5.1, TrueHD 7.1, and 4K Atmos dating back to the early 1980s. The interface is organized by format; you will find the 4K section where files are available in MP4, MKV, and TS containers. dolby atmos demo 4k hdr%28download%29
Save the .mkv or .mp4 demo clip to a local hard drive or a Network Attached Storage (NAS) device. To help you get the exact video files
Websites like and Demolandia are the premier community hubs for home theater enthusiasts. They archive official trailers shown in commercial cinemas. The interface is organized by format; you will
Demolandia offers neatly categorized sections specifically built for testing audio equipment.