RTMP push from OpenIPC web camera doesn't work (while RTSP pull with the same audio/video settings works)

[MalgathThelamin]

I am using go2rtc version 1.9.4 on Debian Bookworm arm64.

Issue description

I push an RTMP stream from my camera (102.168.0.188, running OpenIPC) to go2rtc (192.168.0.2). However, http://192.168.0.2:1984/stream.html?src=mystream shows black video player with webrtc/offer: stream not found message.

If I stop the video pushing from the camera and configure go2rtc to pull the video from the camera via RTSP protocol, the player shows video normally.

How to replicate the issue

1. Configure an OpenIPC camera to push RTMP stream to rtmp://[go2rtc IP]/mystream (Majestic > Settings > Outgoing)
2. Run go2rtc.
3. Open http://**[go2rtc IP]**:1984/stream.html?src=mystream with your browser.

Files

go2rtc.yaml

rtmp:
  listen: ":1935"
log:
  level: trace
  api: trace
  exec: trace
  ngrok: trace
  rtsp: trace
  streams: trace
  webrtc: trace

go2rtc.log

11:04:56.565 INF go2rtc platform=linux/arm64 revision=a4885c2 version=1.9.4
11:04:56.565 DBG build vcs.time=2024-06-18T18:33:36Z version=go1.22.4
11:04:56.565 INF config path=/home/pi/Downloads/go2rtc/go2rtc.yaml
11:04:56.565 TRC [api] register path path=/
11:04:56.565 TRC [api] register path path=/api
11:04:56.566 TRC [api] register path path=/api/config
11:04:56.566 TRC [api] register path path=/api/exit
11:04:56.566 TRC [api] register path path=/api/restart
11:04:56.566 TRC [api] register path path=/api/log
11:04:56.566 TRC [api] register path path=/api/ws
11:04:56.566 TRC [api] register path path=/api/streams
11:04:56.566 TRC [api] register path path=/api/streams.dot
11:04:56.566 INF [rtsp] listen addr=:8554
11:04:56.566 INF [api] listen addr=:1984
11:04:56.567 INF [webrtc] listen addr=:8555/tcp
11:04:56.567 TRC [api] register path path=/api/webrtc
11:04:56.567 TRC [api] register path path=/api/frame.mp4
11:04:56.567 TRC [api] register path path=/api/stream.mp4
11:04:56.567 TRC [api] register path path=/api/stream.m3u8
11:04:56.567 TRC [api] register path path=/api/hls/playlist.m3u8
11:04:56.567 TRC [api] register path path=/api/hls/segment.ts
11:04:56.567 TRC [api] register path path=/api/hls/init.mp4
11:04:56.567 TRC [api] register path path=/api/hls/segment.m4s
11:04:56.567 TRC [api] register path path=/api/frame.jpeg
11:04:56.567 TRC [api] register path path=/api/stream.mjpeg
11:04:56.567 TRC [api] register path path=/api/stream.ascii
11:04:56.567 TRC [api] register path path=/api/stream.y4m
11:04:56.568 TRC [api] register path path=/static
11:04:56.568 TRC [api] register path path=/streams
11:04:56.568 TRC [api] register path path=/stream/
11:04:56.568 TRC [hass] can't import config: open .storage/core.config_entries: no such file or directory
11:04:56.568 TRC [api] register path path=/api/hass
11:04:56.568 TRC [api] register path path=/onvif/
11:04:56.568 TRC [api] register path path=/api/onvif
11:04:56.568 TRC [api] register path path=/api/webtorrent
11:04:56.569 TRC [api] register path path=/api/stream.flv
11:04:56.569 INF [rtmp] listen addr=:1935
11:04:56.569 TRC [api] register path path=/api/ffmpeg
11:04:56.569 TRC [api] register path path=/api/ffmpeg/devices
11:04:56.569 TRC [api] register path path=/api/ffmpeg/hardware
11:04:56.569 TRC [api] register path path=/api/stream
11:04:56.569 TRC [api] register path path=/api/dvrip
11:04:56.569 TRC [api] register path path=/api/stream.ts
11:04:56.569 TRC [api] register path path=/api/stream.aac
11:04:56.569 TRC [api] register path path=/api/roborock
11:04:56.570 TRC [api] register path path=/api/homekit
11:04:56.570 TRC [api] register path path=/api/nest
11:04:56.570 TRC [api] register path path=/api/gopro
11:04:56.570 TRC [api] register path path=/api/stack
11:04:58.949 ERR github.com/AlexxIT/go2rtc/internal/rtmp/rtmp.go:61 > error="rtmp: read command 020007636f6e6e656374003ff000000000000003000361707002000000047479706502000a6e6f6e70726976617465000e737570706f727473476f417761790101000673776655726c02001272746d703a2f2f3139322e3136382e302e320005746355726c02001272746d703a2f2f3139322e3136382e302e32000009"
11:05:05.080 TRC [api] GET /stream.html?src=mystream 192.168.1.205:60086
11:05:05.121 TRC [api] GET /video-stream.js 192.168.1.205:60086
11:05:05.151 TRC [api] GET /video-rtc.js 192.168.1.205:60086
11:05:05.171 TRC [api] GET /api/ws?src=mystream 192.168.1.205:60088
11:05:05.218 TRC [api] ws msg type=webrtc/offer
11:05:05.218 DBG [webrtc] new consumer src=mystream
11:05:05.220 TRC [api] ws msg type=webrtc/candidate
11:05:05.221 TRC [webrtc] remote candidate="candidate:2361374035 1 udp 2113937151 9db8c05c-e170-4953-91bb-00454645d45a.local 56158 typ host generation 0 ufrag Onko network-cost 999"
11:05:06.637 TRC [api] ws msg type=mse
11:05:06.640 TRC [api] ws msg type=mjpeg

[AlexxIT]

11:04:58.949 ERR github.com/AlexxIT/go2rtc/internal/rtmp/rtmp.go:61 > error="rtmp: read command 020007636f6e6e656374003ff000000000000003000361707002000000047479706502000a6e6f6e70726976617465000e737570706f727473476f417761790101000673776655726c02001272746d703a2f2f3139322e3136382e302e320005746355726c02001272746d703a2f2f3139322e3136382e302e32000009"

[MalgathThelamin]

@AlexxIT, do you mean that the problem is on the camera side?

[AlexxIT]

I don't know. RTMP awful legacy protocol. I need to check what inside this message.

[MalgathThelamin]

This message is encoded in AMF0 format and represents the following data:

"connect"
1.0
{
    "app": "",
    "type": "nonprivate",
    "supportsGoAway": true,
    "swfUrl": "rtmp://192.168.0.2",
    "tcUrl": "rtmp://192.168.0.2"
}

Decoding details

``` 02 - String 0007 - Length 636f6e6e656374 - "connect" 00 - Double 3ff0000000000000 - 1.0 03 - Object 0003 - Length 617070 - "app" 02 - String 0000 - Length 0004 - Length 74797065 - "type" 02 - String 000a - Length 6e6f6e70726976617465 - "nonprivate" 000e - Length 737570706f727473476f41776179 - "supportsGoAway" 01 - Boolean 01 - True 0006 - Length 73776655726c - "swfUrl" 02 - String 0012 - Length 72746d703a2f2f3139322e3136382e302e32 - "rtmp://192.168.0.2" 0005 - Length 746355726c - "tcUrl" 02 - String 0012 - Length 72746d703a2f2f3139322e3136382e302e32 - "rtmp://192.168.0.2" 0000 - Empty length 09 - Object end ```

[MalgathThelamin]

@AlexxIT, the error is being raised in https://github.com/AlexxIT/go2rtc/blob/master/pkg/rtmp/server.go:120

        if c.App == "" {
            return fmt.Errorf("rtmp: read command %x", b)
        }

The app field is "" in the message (see my previous comment). The camera sends the RTMP stream to an URL without an application name: rtmp://192.168.0.2/mystream. This is because the documentation says so. The URL with an application name would be, for example, rtmp://192.168.0.2/myapp/mystream.

Later in https://github.com/AlexxIT/go2rtc/blob/master/internal/rtmp/rtmp.go:80 you use the app name as a stream name:

        stream := streams.Get(rtmpConn.App)
        if stream == nil {
            return errors.New("stream not found: " + rtmpConn.App)
        }

I tried to push the video to rtmp://192.168.0.2/mystream/mystream, but I still got an error: stream not found: mystream.

[AlexxIT]

"stream not found" - because you haven't created it manually in config: https://github.com/AlexxIT/go2rtc?tab=readme-ov-file#incoming-sources

[MalgathThelamin]

My go2rtc.yaml is:

streams:
  mystream
rtmp:
  listen: ":1935"
log:
  level: trace
  api: trace
  exec: trace
  ngrok: trace
  rtsp: trace
  streams: trace
  webrtc: trace

I stream to rtmp://192.168.0.2/mystream/mystream.

I get an error:

18:10:49.018 ERR github.com/AlexxIT/go2rtc/internal/rtmp/rtmp.go:61 > error="stream not found: mystream"

What am I doing wrong?

[MalgathThelamin]

By the way, how do you create a log file, not only display the log information on the screen?

[AlexxIT]

You need ":" after stream name. YAML rules

[MalgathThelamin]

Thank you! Now I can see the stream in the go2rtc console.

Please note, that even without :, it is a valid YAML. Please consider adding an example of what you mean by stream with empty source to the documentation.

It seems that the correct URL to push RTMP to is rtmp://192.168.0.2/mystream/anything, where anything means really anything. If I am right, please consider adding it to the documentation.

Unfortunately, the stream shows up, but does not play in the go2rtc console. The built-in player shows mse: streams: unknown error.

Please see the attached go2rtc.log.

[AlexxIT]

Try to get stream info for active stream. I can't see any codecs information for your stream in logs.

[MalgathThelamin]

{
  "producers": [
    {
      "id": 16,
      "format_name": "rtmp",
      "protocol": "rtmp",
      "remote_addr": "192.168.0.188:57012",
      "bytes_recv": 22970920
    }
  ],
  "consumers": null
}