Make the examples use autovideosink and ffmpegcolorspace for better
compàtibility.
Make some more variables for the sink and the decoders.
Set zerolatency tuning on x264enc for better realtime results.
Original commit message from CVS:
* tests/examples/rtp/client-H263p.sdp:
* tests/examples/rtp/client-H263p.sh:
* tests/examples/rtp/server-VTS-H263p.sh:
Add some more H263p server and client examples.