code: private UploadedMedia uploadMediaChunkedInit(long size) throws TwitterException {
  		return new UploadedMedia(post(
  				conf.getUploadBaseURL() + "media/upload.json",
  				new HttpParameter[] { new HttpParameter("command", CHUNKED_INIT),
  						new HttpParameter("media_type", "video/mp4"), 
  						new HttpParameter("media_category", "tweet_video"),
  						new HttpParameter("total_bytes", size) })
  				.asJSONObject());
  	}
docs: "command=INIT&media_type=video/mp4&total_bytes=4430752"