https://docs.wallpaperengine.io

Make sure that your video is not using a higher resolution than 1080p (1920 x 1080) or otherwise it will not work for Windows 7 users, they will see a blank screen.

Open the editor by right clicking the tray icon of Wallpaper Engine and choosing Create Wallpaper. Choose New Video Wallpaper in the modal dialog to begin creating a new wallpaper with video support.



Now define a title for your wallpaper and select your video file. The video should use the mp4 container format and be encoded with the h.264 codec for best results. It will be automatically cropped and fitted for any aspect ratio, but using an aspect ratio of 16:9 is generally recommended.



The video wallpaper should now show up in the preview window.

Before uploading your wallpaper to Steam Workshop, you should also configure a matching scheme color under Edit -> Change project settings:



Change the default scheme color by clicking on the color chooser button. This color will be applied to Windows along with your wallpaper if the user chose to enable color adjustments.

With everything set up, open the prepare to publish menu:



Adjust the settings as you need. To apply tags, start typing in the tags window and the auto complete feature should show up to show you possible tags. If you have ideas for additional tags please post them in the forums.

You are also required to create a preview image, click on Take Snapshot to record an image in the editor or import an image you created by hand by clicking Import Image.



To take an image in the editor, use the left mouse button to drag a square to define the image bounds and hit enter when you're satisfied to save the image.

When everything is done, hit Publish to Steam in the bottom right corner and wait for all data to be uploaded. You can continue editing your workshop item on Steam afterwards to add additional screenshots or videos.