--- INSTALL ---

Install vala and build app usual way
  $ make
  $ make install
#TODO(vasaka) geather dependencies here

--- RUN ---

$ v4lsink

The default pipeline is
  'v4l2src device=/dev/video0 ! ffmpegcolorspace ! V4l2SinkLoopback'
outputting to /dev/video1

So if you have 640x480 webcam at /dev/video0 you can check result with command
  $ mplayer tv:// -tv device=/dev/video1
or
  $ luvcview -d /dev/video1 -f yuv
or just select /dev/video1 in skype and transmit fun video
If you want another resolution change it in gst-v4lsink-loopback.vala

you also can pass custom pipeline with fancy video filters as command line
parameter. The last element in pipeline should be V4l2SinkLoopback.

If you want to use some effect filters - run this:
  $ v4lsink 'v4l2src device=/dev/video0 ! ffmpegcolorspace ! effect !\
             ffmpegcolorspace ! V4l2SinkLoopback'
with 'effect' being any registered gstreamer video effect plugin, 'warptv' for
example.

To play any videofile, and apply effects to it, you can use somethig like:
  $ v4lsink 'filesrc location=file.avi ! decodebin ! ffmpegcolorspace !\
             videoscale ! video/x-raw-rgb, width=640,height=480 ! warptv !
             ffmpegcolorspace ! V4l2SinkLoopback'