pipeline = gst_parse_launch("v4lsrc name=webcam ! tee name=tee .src0 ! xvimagesink name=display tee.src1 ! queue ! ffmpegcolorspace name=csp ! jpgenc ! filesink name=image_sink",
     &error1);
  if (!pipeline)
    {
      fprintf (stderr, "Parse error in central branch: %s\n", error1->message);
      return 1;
    }

   ffmpegcolorspace = gst_bin_get_by_name (GST_BIN (pipeline), "csp");
   screen_sink = gst_bin_get_by_name (GST_BIN (pipeline), "display");
   image_sink = gst_bin_get_by_name (GST_BIN (pipeline), "image_sink");
   pad = gst_element_get_pad (ffmpegcolorspace, "sink");
   gst_pad_set_blocked (pad, TRUE);