Description
Describe the bug
I am streaming CCTV by connecting flutter web app to media server (MediaMtx).
CCTV >>-RTSP-> MediaServer >>-WebRTC(whip)-> Flutter WebApp
When I send offer to media server, I get the following error response.
{"error":"SetRemoteDescription called with no ice-ufrag"}
When I access flutter web app deployed on server with browser and create offer, there is no ice-ufrag in sdp.
(There is no problem on other platforms. Tested on Mac/Linux desktop app)
Offer created in flutter web app
{
"sdp": "v=0\r\no=- 2255995336151650286 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\n",
"type": "offer"
}
Offer created in flutter mac desktop app
{
"sdp": "v=0\r\no=- 3576179439790245548 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 99 100 101 127 103 35 36 104 105 106 37\r\nc=IN IP4 0.0.0.0\r\na=rtcp:9 IN IP4 0.0.0.0\r\na=ice-ufrag:Zw6e\r\na=ice-pwd:3hbBJQvy5iHcCpjW8cE/ZCtE\r\na=ice-options:trickle renomination\r\na=fingerprint:sha-256 47:C6:BD:4C:43:CB:50:07:91:FC:CD:5A:D4:98:EC:48:DA:A0:AE:79:16:0E:6A:8B:5A:F6:F2:C9:5C:55:4F:C2\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 H264/90000\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=fmtp:96 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640c33\r\na=rtpmap:97 rtx/90000\r\na=fmtp:97 apt=96\r\na=rtpmap:98 H264/90000\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 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e033\r\na=rtpmap:99 rtx/90000\r\na=fmtp:99 apt=98\r\na=rtpmap:100 VP8/90000\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=rtpmap:101 rtx/90000\r\na=fmtp:101 apt=100\r\na=rtpmap:127 VP9/90000\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=rtpmap:103 rtx/90000\r\na=fmtp:103 apt=127\r\na=rtpmap:35 AV1/90000\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=rtpmap:36 rtx/90000\r\na=fmtp:36 apt=35\r\na=rtpmap:104 red/90000\r\na=rtpmap:105 rtx/90000\r\na=fmtp:105 apt=104\r\na=rtpmap:106 ulpfec/90000\r\na=rtpmap:37 flexfec-03/90000\r\na=rtcp-fb:37 goog-remb\r\na=rtcp-fb:37 transport-cc\r\na=fmtp:37 repair-window=10000000\r\n",
"type": "offer"
}
Expected behavior
The connection should be successful because ice-ufrag is included in sdp of offer.
Platform information
- Flutter version: flutter doctor -v
[✓] Flutter (Channel stable, 3.32.1, on macOS 15.1.1 24B91 darwin-arm64, locale ko-KR) [2.2s]
• Flutter version 3.32.1 on channel stable at /Users/sclee-mac/MyApp/DevEnv/flutter_samsung
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision b25305a883 (4 weeks ago), 2025-05-29 10:40:06 -0700
• Engine revision 1425e5e9ec
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• Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
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• CocoaPods version 1.16.2
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[✓] Connected device (2 available) [7.9s]
• macOS (desktop) • macos • darwin-arm64 • macOS 15.1.1 24B91 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 137.0.7151.120
[✓] Network resources [1,403ms]
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• No issues found!
- Plugin version: flutter_webrtc 0.14.1
- OS: Web
- OS version:
chrome 137.0.7151.120
safari 18.1.1(20619.2.8.11.12)