public void stop() {
		if (t != null) {
			try {
				is.close();
			} catch (IOException ignore) {}
			t.interrupt();
			try {
				t.join();
			} catch (InterruptedException e) {}
			t = null;
		}
	}
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