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Rapportera problem med översättningen
But i never tried videos with alpha channel in Wallpaper Engine, so i don´t know if that is even possible.
Webm transparency works within a webwallpaper, but you would have to add the video manually to each wallpaper individually. Could do that with these steps:
1. Duplicating the webwallpaper ( to avoid updates overwriting your changes )
2. Adding your video to the folder
3. Adding a line something like this into the html file
<video src="video.webm" autoplay loop style="position: fixed; top: 0; left:0; width: 100%; height: 100%; z-index: 1000" ></video>
You might be able to find some application you can use in combination with WE to overlay all wallpapers but I wouldn't know one. Rainmeter doesn't support video I believe.
For windows 7 ( and a bit of a stretch ), the gadgets that windows 7 and vista supported can be built with html and support transparency. But I think the webrenderer it uses might be to old to support transparent videos ( though gif's might work ). But those were discontinued after windows 7 I believe.
Would it be possible, that you build or install some sort of extra transparency or alpha layer/mask, which will use any regular supported video as an alpha/transparency, that we put in it? Maybe if it just automatically make it a greyscale video (desaturation), and uses its black and white values as indicator, how much transparent all the regions have to be.
With such a layer, it would not matter, if the video itself contain an alpha channel, as the extra layer would create it.
This of course would work best, if the users make their own "transparency"-Videos for those layers, which contain the alpha mask in video form. Many animated b/w pictures, that work together with the coloured video.
Such a thing is pretty easy with 3D software, they can create the fitting alpha channels (as b/w pictures or video sequences) durning their normal renderings. I am pretty sure, this can be done with a better video editing software too.
So you are right, that this would not work so well with normal videos, that would be used for both color and alpha mask, or that are not made exactly for this purpose. But even "not so well" is better than no support for this feature ^.^
If using separate video files as alpha/transparency masks, the only requirement would be, that those two videos need to be linked somehow, so that both of them would play at the same time, even if some random events occur (like shuffeling through several videos to create a random playlist within the screensaver).
This would allow several animated layers in front of an animated background image.