火狐中的WebRTC活动流(H264)错误，无法生成有效的SDP应答
我正在尝试使用Janus在H264浏览器中运行H264编码的实时流。在用Chrome进行测试时，流运行得很好，但在firefox中却显示了ICE failed, add a TURN server and see about:webrtc for more details。
下面是我的火狐about:webrtc日志。
[ 6442450983 ] http://192.168.2.194:5000/ 15:18:19 GMT+0530 (IST)
PeerConnection ID: 1515491295667117 (id=6442450983 url=http://192.168.2.194:5000/)
ICE Stats
Local Candidate Remote Candidate ICE State Priority Nominated Selected Bytes sent Bytes received
ICE restarts:
ICE rollbacks:
SDP
Local SDP
v=0
o=mozilla...THIS_IS_SDPARTA-57.0.4 3500649212029345392 0 IN IP4 0.0.0.0
s=-
t=0 0
a=sendrecv
a=fingerprint:sha-256 11:44:F1:BD:D1:69:8E:17:E0:9A:AA:89:8E:76:9F:4E:09:E1:94:D0:37:34:EE:FE:DF:5E:FC:77:B0:4D:F7:53
a=ice-options:trickle
a=msid-semantic:WMS *
m=video 0 RTP/SAVPF 120
c=IN IP4 0.0.0.0
a=inactive
a=end-of-candidates
a=mid:video
a=rtpmap:120 VP8/90000
Remote SDP
v=0
o=- 1515491295396595 1515491295396595 IN IP4 106.51.68.195
s=-
t=0 0
a=sendrecv
a=group:BUNDLE video
a=msid-semantic:WMS janus
m=video 9 RTP/SAVPF 126
c=IN IP4 106.51.68.195
a=candidate:1 1 udp 2013266431 192.168.2.194 45887 typ host
a=candidate:2 1 udp 1677722111 106.51.68.195 45887 typ srflx raddr 192.168.2.194 rport 45887
a=sendonly
a=end-of-candidates
a=fingerprint:sha-256 D2:B9:31:8F:DF:24:D8:0E:ED:D2:EF:25:9E:AF:6F:B8:34:AE:53:9C:E6:F3:8F:F2:64:15:FA:E8:7F:53:2D:38
a=ice-options:trickle
a=ice-pwd:KsS99rsAZXj9lFd7psCT61
a=ice-ufrag:3tcw
a=mid:video
a=rtcp-fb:126 nack
a=rtcp-fb:126 goog-remb
a=rtcp-mux
a=rtpmap:126 H264/90000
a=setup:actpass
a=ssrc:3973486276 cname:janusvideo
a=ssrc:3973486276 msid:janus janusv0
a=ssrc:3973486276 mslabel:janus
a=ssrc:3973486276 label:janusv0
RTP Stats我甚至尝试添加以下转服务器
{urls: "turn:numb.viagenie.ca",
username: "l1787875@mvrht.com",
credential: "test"}但是控制台错误更改为ICE failed, your TURN server appears to be broken, see about:webrtc for more details，保持about:webrtc日志与以前相同。
我发现Firefox无法为Janus提供的SDP提供一个有效的答案。由火狐创建的答案具有属性rtpmap: 120 VP8/90000，而Janus提供的SDP有属性rtpmap: 127 H264/90000，这阻止了火狐与Janus建立SDP会话。Chrome可以用rtpmap: 127 H264/90000生成有效的答案，这样它就可以完美地显示流。
我正在使用Mozilla firefox-57.0.4。有没有办法，我可以从Janus获得/为传入的SDP answer生成一个有效的SDP offer？
回答 1
Stack Overflow用户
发布于 2018-03-10 03:03:32
这个解决方案对我有效(最后一条黄色消息)：https://groups.google.com/forum/#!topic/meetecho-janus/jKg5u9421kM
我正在使用Janus和我在Firefox中得到了同样的错误。问题是关于SDP配置文件级别-id。我只需要更换它：
// Create offer/answer now if(jsep === null || jsep === undefined) { createOffer(handleId, media, callbacks); } else { if(adapter.browserDetails.browser === "edge") { // This is Edge, add an a=end-of-candidates at the end jsep.sdp += "a=end-of-candidates\r\n"; } var oldsdp = jsep["sdp"]; var pattern=/420029/gi; var newsdp = oldsdp.replace(pattern,"42e01f"); Janus.log(newsdp); jsep["sdp"]=newsdp; config.pc.setRemoteDescription( new RTCSessionDescription(jsep), function() { Janus.log("Remote description accepted!"); createAnswer(handleId, media, callbacks); }, callbacks.error); } }
https://stackoverflow.com/questions/48165631
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