nailer it's a lightweight thumbnailer that uses mplayer I used the gnome2 eclass in the ebuild for the gconf stuff but I think nailer can be used without gnome too, simply ignoring the gconf schema. I also wrote a little patch for the gconf schema to use nailer for video@x-flv mime type (the flash video file)
Created attachment 170631 [details] media-video/nailer-0.4.3.ebuild
Created attachment 170633 [details, diff] files/x-flv.patch