FFMPEG的SDP(IP地址) [英] SDP for FFMPEG (IP addresses)

问题描述

我正在通过RTP接收音频，所以我正在从生成的SDP中打开输入.媒体来自 Port_sender ， IP_sender .用于侦听的服务器的IP和端口: IP_server ， Port_server .这是我的SDP模板.我应该将 {Port_sender，IP_sender，IP_server，Port_server} 的内容用于我送给ffmpeg的SDP的 {％1％，％2％，％3％} 以及我还给发件人的SDP?

I'm receiving audio via RTP, so I'm opening input from the SDP I generate. Media is coming from Port_sender, IP_sender. IP and port of the server for listening: IP_server, Port_server. Here is my SDP template. What of {Port_sender, IP_sender, IP_server, Port_server} should I put in {%1%, %2%, %3%} for the SDP that I feed to ffmpeg and for the SDP that I give back to the sender?

\n\nv=0\n
o=- 0 0 IN IP4 %1%\n
s=name\n
c=IN IP4 %2%\n
t=0 0\n
a=tool:libavformat 57.3.100\n
m=audio %3% RTP/AVP 97\n
b=AS:705\n
a=rtpmap:97 PCMU/44100/2\n"

现在对我来说，很难从不同的IP对其进行调试.但是从一台计算机上它可以完美运行.

Debugging it from different IPs is hard for me now. But from one computer it works perfectly.

推荐答案

我建议您阅读

I encourage you to read the RFC 4566, it explains everything you are wondering.

• o = 代表来源
• c = 代表连接数据
• m = 代表媒体描述

• o= stands for Origin
• c= stands for Connection data
• m= stands for Media descriptions

对于眼前的问题，我假设您收到带有 SDP 报价的 SIP INVITE ，并且您必须以 SIP 200 OK进行回复 SDP 答复的code>.

For the question at hand, I assume you receive a SIP INVITE with a SDP offer, and you have to reply with a SIP 200 OK containing the SDP reply.

在这种情况下，您应该回复:

In that scenario you should reply with:

• ％1％-> IP服务器
• ％2％-> IP_server ，假设是单播会话连接地址包含预期数据源的单播IP地址"
• ％3％-> Port_sender ，因为 m = 是媒体流要发送到的传输端口(已定义的端口由发件人在报价中提供.

• %1% -> IP_server
• %2% -> IP_server, assuming a uni-cast session "the connection address contains the uni-cast IP address of the expected data source"
• %3% -> Port_sender, since m= is the transport port to which the media stream is sent (Port that was defined by the sender in his offer).

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