A free program for Android, by 4K4U.

The 4K Waterfall Video Live Wallpaper is a free app that gives ultra HD Quality Video Wallpaper with Ultra Low App Size.  Your screen’s resolution will be automatically changed to meet its size and orientation. Because of this, even on older devices, great performance and outstanding video quality are achieved without sacrificing battery life. This is one of the highest-quality video wallpapers available on Google Play since it only used 4k videos that you will surely enjoy using. if you have any feedback about the app, you can contact them at [email protected] to help them improve the quality of the wallpapers.