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rtsp协议实例_rtsp协议_mpls vpn 配置实例(5)

电脑杂谈　发布时间：2017-05-17 17:08:43　来源：网络整理

第六步：RTCP控制协议。在传输过程中通知rtsp server。端口是rtp端口1

0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       --------------------------------
header |V=2|P|    RC   |   PT=SR=200   |             length            |
       --------------------------------
       |                         SSRC of sender                        |
       ================================
sender |              NTP timestamp, most significant word             |
info   --------------------------------
       |             NTP timestamp, least significant word             |
       --------------------------------
       |                         RTP timestamp                         |
       --------------------------------
       |                     sender's packet count                     |
       --------------------------------
       |                      sender's octet count                     |
       ================================
report |                 SSRC_1 (SSRC of first source)                 |
block  --------------------------------
  1    | fraction lost |       cumulative number of packets lost       |
       --------------------------------
       |           extended highest sequence number received           |
       --------------------------------
       |                      interarrival jitter                      |
       --------------------------------
       |                         last SR (LSR)                         |
       --------------------------------
       |                   delay since last SR (DLSR)                  |
       ================================
report |                 SSRC_2 (SSRC of second source)                |
block  --------------------------------
  2    :                               ...                             :
       ================================
       |                  profile-specific extensions                  |
       --------------------------------

RTCP和RTP的机制类FTP的命令端口20和数据端口21的关系。一个走数据一个走控制。

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