The never-ending story of new features:
* add more codecs into our codec map
* encoding support lacks:
   - event handling (particularly discont/flush and EOS)
* both encoding and decoding lacks:
   - prevent data copying
* demux/mux support lacks:
   - good testing of exotic formats
   - correct caps sets on the pad templates
   - event handling in the loop function (mux)
   - prevent data copying
* ffvideoscale, ffdeinterlace and other filter elements
* can we wrap URLProtocol as a source/sink?

If you have cool ideas, add them here or contact the mailinglist:
<gstreamer-devel@lists.sf.net>