I'm also working on "Texture Movies" now. That are again coded movies, but all you need is in prims: Normal and animated textures, sounds, scripts. You have a real movie feeling with this. A problem was to hear the sound everywhere in the "cinema" room. I solved it with linked prims (sound boxes), triggered by a script in the screen prim. So you don't have to ALT-ZOOM to the screen to hear something.
You can see it here. (May 2014. Nowhere to be seen at the moment)