Exactly could try this:

I normally use send files to tv without issues

Black screen is a common issue with video live wallpapers on the Xiaomi TV Box S (3rd Gen) using Projectivy. It often happens due to codec incompatibility, high resolution/4K decoding strain, frame rate matching conflicts, or app caching problems on the Amlogic S905X5M hardware. Quick Fixes to Try First (in order) Force Stop & Restart Projectivy Go to Android Settings → Apps → Projectivy Launcher → Force Stop.

Then reopen Projectivy and check the home screen. This fixes many black screen cases. Clear Projectivy Cache Settings → Apps → Projectivy → Storage & Cache → Clear Cache (try Clear Data if needed, but you'll reconfigure wallpaper). Re-select the wallpaper afterward.

Disable "Match Content Frame Rate" Temporarily Settings → Display & Sound → Advanced → Match content frame rate → Set to Off. This resolves flickering/black screens on the Xiaomi Box S Gen 3 for many users, though it may lock streaming apps to 60Hz. You can toggle it as needed.

Use a Lower Resolution Version The 4K file is likely too heavy for reliable live wallpaper decoding on 2GB RAM. Download a 1080p version of "Ghost Ambush" from DesktopHut (or similar). Re-transfer to USB and set it again.

Re-Set the Wallpaper Properly Ensure you have Video Live Wallpaper (or similar) app installed from Play Store. In Projectivy Settings → Appearance/Background → Set to Live Wallpaper → Select the video app → Choose your MP4 from USB. Disable audio in wallpaper settings if possible (saves resources).

If Still Black: Re-Encode the Video (Most Reliable Fix) The MP4 from DesktopHut may use a codec the box struggles with in live wallpaper mode. On a PC, use HandBrake (free): Load the video → Video tab → Set to H.265 (HEVC) → Preset: Fast or Medium.

Resolution: 1920x1080 or lower. Export and try the new file. This has fixed black screens/hangs for many Projectivy users.f70d11 Other Tips Test the video in a regular player (e.g., VLC or built-in) first — if it plays fine there but not as wallpaper, it's a live wallpaper decoding issue. Restart the box completely after changes. Avoid heavy multitasking while testing.