2018-07-14, 14:58
@MrPatate There is a skin setting called "Show background video" that should do exactly that. I have had one user report that it didn't work for him, but I couldn't reproduce it, as it works just fine for files played from the library. I can't speak for networked files, as I imagine that there might be some issues there. There is a Kodi setting that overrides the screensaver and dims the screen when a video is playing, so that's probably why you see this behaviour. The skin itself doesn't mess with screensavers at all.
Now, on your last point, there is no way to play a trailer as background. The best you can do is use something like a long .gif file, as the skin expects an image, not a video. I'm not even sure a gif would work. I don't think that Kodi will ever have such an option, as it would cause massive lags as you continuously play trailers while scrolling through the library. You might try browsing through the forums, some users might have come up with some alternative, or something close to what you described.
Now, on your last point, there is no way to play a trailer as background. The best you can do is use something like a long .gif file, as the skin expects an image, not a video. I'm not even sure a gif would work. I don't think that Kodi will ever have such an option, as it would cause massive lags as you continuously play trailers while scrolling through the library. You might try browsing through the forums, some users might have come up with some alternative, or something close to what you described.