gstreamer: upgrade to 1.0.10
orc: upgrade to 0.4.18
gst-plugins-base: upgrade to 1.0.10
gst-plugins-good: upgrade to 1.0.10
gst-plugins-ugly: upgrade to 1.0.10
gst-plugins-bad: upgrade to 1.0.10
gst-ffmpeg: upgrade to gst-libav-1.0.10

I'm not happy about the switch to libav:
http://blog.pkh.me/p/13-the-ffmpeg-libav-situation.html

So I tried every version of ffmpeg's libav to find one that was
compatible enough, but the libav folks managed to change just a bit
too much and too subtle. Unfortunately gstreamer went with them, while
others (mplayer, xine, vlc) stayed with ffmpeg.
gst-python: upgrade to 0.10.22 git release

no stable releases have been made in a long time.
upstream advices to use the git version for now
rename gst-ffmpeg -> gst-libav  (gstreamer)
whitespace cleaning service :)

Wondering when nix'ers all start using sensible editors :P