public void start() {
		if (t==null) {
			t = new Thread(this);
			t.start();
		}
	}
RFC 4629.

  H.263 Streaming over RTP.
  
  Must be fed with an InputStream containing H.263 frames.
  The stream must start with mpeg4 or 3gpp header, it will be skipped.
src/net/majorkernelpanic/streaming/rtp/H263Packetizer.java