SEND_COMMAND     1450 gst/gstpoll.c      SEND_COMMAND (set, GST_POLL_CMD_WAKEUP, result);
SEND_COMMAND     1488 gst/gstpoll.c      SEND_COMMAND (set, GST_POLL_CMD_WAKEUP, result);
SEND_COMMAND     1527 gst/gstpoll.c      SEND_COMMAND (set, GST_POLL_CMD_WAKEUP, result);