【webrtc】SDP: rtcp-mux

本文介绍了WebRTC中RTCP-Mux的使用策略,即RTCRtcpMuxPolicy。默认情况下,该策略设置为'require',表示在收集ICE候选时必须启用RTCP复用。

RTCRtcpMuxPolicy 是关于传输rtcp包的ice地址收集的

  • 默认是必须开启的。

rtcpMuxPolicy of type RTCRtcpMuxPolicy, defaulting to “require”.
Indicates which rtcp-mux policy to use when gathering ICE candidates.

在这里插入图片描述

RTC remote offer: v=0\r\no=- 33780994132570702 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\nm=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 35 36 37 38 102 103 104 105 106 107 108 109 127 125 39 40 41 42 43 44 45 46 47 48 112 113 114 115 116 117 118 49\r\nc=IN IP4 0.0.0.0\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=ice-ufrag:v/KO\r\na=ice-pwd:rhSMjydHkufgnpKEOXJ//RKG\r\na=ice-options:trickle\r\na=fingerprint:sha-256 DF:05:E0:D5:00:80:50:9F:DF:0E:88:51:5C:CA:FD:AD:29:97:C3:B1:24:F4:B4:D7:04:BE:30:7B:D2:E5:74:EC\r\na=setup:actpass\r\na=mid:0\r\na=extmap:1 urn:ietf:params:rtp-hdrext:toffset\r\na=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=extmap:3 urn:3gpp:video-orientation\r\na=extmap:4 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\r\na=extmap:5 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay\r\na=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type\r\na=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing\r\na=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/color-space\r\na=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\r\na=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\r\na=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id\r\na=recvonly\r\na=rtcp-mux\r\na=rtcp-rsize\r\na=rtpmap:96 VP8/90000\r\na=rtcp-fb:96 goog-remb\r\na=rtcp-fb:96 transport-cc\r\na=rtcp-fb:96 ccm fir\r\na=rtcp-fb:96 nack\r\na=rtcp-fb:96 nack pli\r\na=rtpmap:97 rtx/90000\r\na=fmtp:97 apt=96\r\na=rtpmap:98 VP9/90000\r\na=rtcp-fb:98 goog-remb\r\na=rtcp-fb:98 transport-cc\r\na=rtcp-fb:98 ccm fir\r\na=rtcp-fb:98 nack\r\na=rtcp-fb:98 nack pli\r\na=fmtp:98 profile-id=0\r\na=rtpmap:99 rtx/90000\r\na=fmtp:99 apt=98\r\na=rtpmap:100 VP9/90000\r\na=rtcp-fb:100 goog-remb\r\na=rtcp-fb:100 transport-cc\r\na=rtcp-fb:100 ccm fir\r\na=rtcp-fb:100 nack\r\na=rtcp-fb:100 nack pli\r\na=fmtp:100 profile-id=2\r\na=rtpmap:101 rtx/90000\r\na=fmtp:101 apt=100\r\na=rtpmap:35 VP9/90000\r\na=rtcp-fb:35 goog-remb\r\na=rtcp-fb:35 transport-cc\r\na=rtcp-fb:35 ccm fir\r\na=rtcp-fb:35 nack\r\na=rtcp-fb:35 nack pli\r\na=fmtp:35 profile-id=1\r\na=rtpmap:36 rtx/90000\r\na=fmtp:36 apt=35\r\na=rtpmap:37 VP9/90000\r\na=rtcp-fb:37 goog-remb\r\na=rtcp-fb:37 transport-cc\r\na=rtcp-fb:37 ccm fir\r\na=rtcp-fb:37 nack\r\na=rtcp-fb:37 nack pli\r\na=fmtp:37 profile-id=3\r\na=rtpmap:38 rtx/90000\r\na=fmtp:38 apt=37\r\na=rtpmap:102 H264/90000\r\na=rtcp-fb:102 goog-remb\r\na=rtcp-fb:102 transport-cc\r\na=rtcp-fb:102 ccm fir\r\na=rtcp-fb:102 nack\r\na=rtcp-fb:102 nack pli\r\na=fmtp:102 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f\r\na=rtpmap:103 rtx/90000\r\na=fmtp:103 apt=102\r\na=rtpmap:104 H264/90000\r\na=rtcp-fb:104 goog-remb\r\na=rtcp-fb:104 transport-cc\r\na=rtcp-fb:104 ccm fir\r\na=rtcp-fb:104 nack\r\na=rtcp-fb:104 nack pli\r\na=fmtp:104 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f\r\na=rtpmap:105 rtx/90000\r\na=fmtp:105 apt=104\r\na=rtpmap:106 H264/90000\r\na=rtcp-fb:106 goog-remb\r\na=rtcp-fb:106 transport-cc\r\na=rtcp-fb:106 ccm fir\r\na=rtcp-fb:106 nack\r\na=rtcp-fb:106 nack pli\r\na=fmtp:106 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\r\na=rtpmap:107 rtx/90000\r\na=fmtp:107 apt=106\r\na=rtpmap:108 H264/90000\r\na=rtcp-fb:108 goog-remb\r\na=rtcp-fb:108 transport-cc\r\na=rtcp-fb:108 ccm fir\r\na=rtcp-fb:108 nack\r\na=rtcp-fb:108 nack pli\r\na=fmtp:108 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f\r\na=rtpmap:109 rtx/90000\r\na=fmtp:109 apt=108\r\na=rtpmap:127 H264/90000\r\na=rtcp-fb:127 goog-remb\r\na=rtcp-fb:127 transport-cc\r\na=rtcp-fb:127 ccm fir\r\na=rtcp-fb:127 nack\r\na=rtcp-fb:127 nack pli\r\na=fmtp:127 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d001f\r\na=rtpmap:125 rtx/90000\r\na=fmtp:125 apt=127\r\na=rtpmap:39 H264/90000\r\na=rtcp-fb:39 goog-remb\r\na=rtcp-fb:39 transport-cc\r\na=rtcp-fb:39 ccm fir\r\na=rtcp-fb:39 nack\r\na=rtcp-fb:39 nack pli\r\na=fmtp:39 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=4d001f\r\na=rtpmap:40 rtx/90000\r\na=fmtp:40 apt=39\r\na=rtpmap:41 H264/90000\r\na=rtcp-fb:41 goog-remb\r\na=rtcp-fb:41 transport-cc\r\na=rtcp-fb:41 ccm fir\r\na=rtcp-fb:41 nack\r\na=rtcp-fb:41 nack pli\r\na=fmtp:41 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=f4001f\r\na=rtpmap:42 rtx/90000\r\na=fmtp:42 apt=41\r\na=rtpmap:43 H264/90000\r\na=rtcp-fb:43 goog-remb\r\na=rtcp-fb:43 transport-cc\r\na=rtcp-fb:43 ccm fir\r\na=rtcp-fb:43 nack\r\na=rtcp-fb:43 nack pli\r\na=fmtp:43 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=f4001f\r\na=rtpmap:44 rtx/90000\r\na=fmtp:44 apt=43\r\na=rtpmap:45 AV1/90000\r\na=rtcp-fb:45 goog-remb\r\na=rtcp-fb:45 transport-cc\r\na=rtcp-fb:45 ccm fir\r\na=rtcp-fb:45 nack\r\na=rtcp-fb:45 nack pli\r\na=fmtp:45 level-idx=5;profile=0;tier=0\r\na=rtpmap:46 rtx/90000\r\na=fmtp:46 apt=45\r\na=rtpmap:47 AV1/90000\r\na=rtcp-fb:47 goog-remb\r\na=rtcp-fb:47 transport-cc\r\na=rtcp-fb:47 ccm fir\r\na=rtcp-fb:47 nack\r\na=rtcp-fb:47 nack pli\r\na=fmtp:47 level-idx=5;profile=1;tier=0\r\na=rtpmap:48 rtx/90000\r\na=fmtp:48 apt=47\r\na=rtpmap:112 H264/90000\r\na=rtcp-fb:112 goog-remb\r\na=rtcp-fb:112 transport-cc\r\na=rtcp-fb:112 ccm fir\r\na=rtcp-fb:112 nack\r\na=rtcp-fb:112 nack pli\r\na=fmtp:112 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=64001f\r\na=rtpmap:113 rtx/90000\r\na=fmtp:113 apt=112\r\na=rtpmap:114 H264/90000\r\na=rtcp-fb:114 goog-remb\r\na=rtcp-fb:114 transport-cc\r\na=rtcp-fb:114 ccm fir\r\na=rtcp-fb:114 nack\r\na=rtcp-fb:114 nack pli\r\na=fmtp:114 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=64001f\r\na=rtpmap:115 rtx/90000\r\na=fmtp:115 apt=114\r\na=rtpmap:116 red/90000\r\na=rtpmap:117 rtx/90000\r\na=fmtp:117 apt=116\r\na=rtpmap:118 ulpfec/90000\r\na=rtpmap:49 flexfec-03/90000\r\na=rtcp-fb:49 goog-remb\r\na=rtcp-fb:49 transport-cc\r\na=fmtp:49 repair-window=10000000\r\n [2025-05-31 16:26:28.541][INFO][1][94y740kp] RTC local answer: v=0\r\no=SRS/6.0.166(Hang) 94641307871968 2 IN IP4 0.0.0.0\r\ns=SRSPlaySession\r\nt=0 0\r\na=ice-lite\r\na=group:BUNDLE 0\r\na=msid-semantic: WMS live/livesteam/7CTXN4L00B09KR-165-0-7\r\nm=video 9 UDP/TLS/RTP/SAVPF 106\r\nc=IN IP4 0.0.0.0\r\na=ice-ufrag:nuj8794p\r\na=ice-pwd:4426176g748ru8gn92t2632027di3387\r\na=fingerprint:sha-256 36:93:81:8D:69:EE:A2:9D:75:25:06:99:8A:0B:2F:76:47:C0:5D:6D:4B:80:81:D7:65:CE:FC:A6:7D:BC:FA:89\r\na=setup:passive\r\na=mid:0\r\na=extmap:4 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01\r\na=sendonly\r\na=rtcp-mux\r\na=rtcp-rsize\r\na=rtpmap:106 H264/90000\r\na=rtcp-fb:106 transport-cc\r\na=rtcp-fb:106 nack\r\na=rtcp-fb:106 nack pli\r\na=fmtp:106 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f\r\na=ssrc:10104 cname:cb26730f43f76059\r\na=ssrc:10104 msid:stream_id_50 video_label_50\r\na=ssrc:10104 mslabel:stream_id_50\r\na=ssrc:10104 label:video_label_50\r\na=candidate:0 1 udp 2130706431 121.237.182.235 8000 typ host generation 0\r\n
最新发布
06-02
### RTC Stream Busy or Already Exists Error (code=5020) in SRS 6.0.166 #### Error Code Analysis The error code `5020 (RTCStreamBusy)` indicates that the RTC stream is either already in use or busy, preventing the creation of a new session[^1]. This issue typically arises due to concurrent access attempts on the same stream identifier or insufficient server resources to handle additional connections. #### SDP Offer and Answer Compatibility To ensure compatibility between SDP offers and answers, especially when using H264/VP9 codecs, ICE negotiation, and RTP/RTCP settings, it is crucial to correctly configure the media streams and signaling protocols. The SDP offer and answer process involves exchanging codec capabilities, ICE candidates, and RTP/RTCP parameters[^3]. #### Codec Configuration for H264/VP9 For H264 and VP9 codecs, the SDP must specify the appropriate payload types and codec-specific parameters. For example: ```sdp m=video 9 UDP/TLS/RTP/SAVPF 96 a=rtpmap:96 H264/90000 a=fmtp:96 profile-level-id=42e01f;packetization-mode=1 ``` This configuration ensures that the client and server agree on the H264 codec with specific profile-level-id and packetization mode[^3]. #### ICE Negotiation ICE negotiation facilitates the establishment of direct peer-to-peer connections by exchanging candidate addresses. The SDP includes ICE-related attributes such as: ```sdp a=ice-ufrag:abc123 a=ice-pwd:def456 a=candidate:1 1 UDP 2130706431 192.168.1.1 54321 typ host ``` These attributes enable the peers to select the best transport path for media transmission[^2]. #### RTP/RTCP Settings RTP and RTCP settings define how media data and control packets are transmitted. The SDP specifies these details: ```sdp a=rtcp:9 IN IP4 0.0.0.0 a=rtcp-mux ``` The `rtcp-mux` attribute indicates that RTCP packets are multiplexed with RTP over the same transport channel[^1]. #### Example Code for SDP Offer and Answer Below is an example of creating an SDP offer and processing the answer in JavaScript using WebRTC APIs: ```javascript const pc = new RTCPeerConnection(); // Add tracks for video and audio navigator.mediaDevices.getUserMedia({ video: true, audio: true }) .then(stream => { stream.getTracks().forEach(track => pc.addTrack(track, stream)); }); // Create SDP offer pc.createOffer() .then(offer => pc.setLocalDescription(offer)) .then(() => { console.log("SDP Offer:", pc.localDescription.sdp); return sendSdpOffer(pc.localDescription.sdp); // Send offer to remote peer }) .then(remoteAnswer => pc.setRemoteDescription(new RTCSessionDescription(remoteAnswer))) .catch(error => console.error("Error during SDP negotiation:", error)); ``` #### Optimizing SRS Configuration To mitigate the `RTCStreamBusy` error, ensure the following configurations in SRS: - Increase the maximum number of allowed connections: ```bash max_connections = 2000 ``` - Enable detailed logging for troubleshooting: ```bash log_level = trace ``` ####
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