Update README.md

Author: js2854

README.md

@@ -3,21 +3,22 @@ A rtsp client write in python
 
     Usage: rtsp-client.py [options] url
 
+    In running, you can control play by input "forward","backward","begin","live","pause"
+    or "play" with "range" and "scale" parameter, such as "play range:npt=beginning- scale:2"
+    You can input "exit","teardown" or ctrl+c to quit
+    
+    
     Options:
       -h, --help            show this help message and exit
       -t TRANSPORT, --transport=TRANSPORT
                             Set transport type when SETUP: tcp, udp, tcp_over_rtp,
                             udp_over_rtp[default]
       -d DEST_IP, --dest_ip=DEST_IP
-                            Set dest ip of udp data transmission, default is
-                            127.0.0.1
+                            Set dest ip of udp data transmission, default use same
+                            ip with rtsp
       -p CLIENT_PORT, --client_port=CLIENT_PORT
                             Set client port range of udp, default is "10014-10015"
       -n NAT, --nat=NAT     Add "x-NAT" when DESCRIBE, arg format
                             "192.168.1.100:20008"
       -r, --arq             Add "x-zmssRtxSdp:yes" when DESCRIBE
       -f, --fec             Add "x-zmssFecCDN:yes" when DESCRIBE
-    
-      In running, you can control play by input "forward","backward","begin","live","pause"
-      or "play" with "range" and "scale" parameter, such as "play range:npt=beginning- scale:2"
-      You can input "exit","teardown" or ctrl+c to quit