An app that forwards SRT streams into Janus videorooms.
This is very much in the work-in-progress/proof-of-concept phase!
I really don't know go, I learned just enough so I could make use of the pion/webrtc library.
This is adapted from the Janus example in Pion's example-webrtc-applications repo.
Pull requests are always welcome!
srt-janus <listen host:port> ws://janus-host:port
# example: srt-janus :8090 ws://127.0.0.1:8188When launched, this app:
- Connects to Janus gateway via websocket, establishes a session.
- Starts listening for incoming SRT sessions.
When a SRT connection is received, it looks for a streamid parameter and uses that to pick a room ID.
Example: srt://127.0.0.1:8090?streamid=1234 - the 1234 becomes the room ID.
The app then joins the janus videoroom and establishes a WebRTC session.
H264 data is forwarded as-is. AAC audio is encoded to Opus using libavcodec, Opus is forwarded as-is.
You must use:
- MPEG-TS as the muxer
- Max 1 video stream
- Max 1 audio stream
- H264 as the video codec
- baseline profile
- AAC-LC audio or Opus audio
- 48kHz, 2-channel only
If you want to send Opus, make sure you're properly muxing it into MPEG-TS. One known bad muxer is ffmpeg 2.8 (and older). ffmpeg 3.0 and newer will work properly.
By default, Janus has a demo videoroom with id 1234, I believe h264 is disabled in the default config.
Edit your `janus.plugin.videoroom.jcfg' config file, find the section for room-1234, make it something like this:
room-1234: {
description = "Demo Room"
secret = "adminpwd"
publishers = 6
bitrate = 128000
fir_freq = 10
#audiocodec = "opus"
videocodec = "h264,vp8"
record = false
#rec_dir = "/path/to/recordings-folder"
}
Restart janus, join a videoroom in your browser.
Run srt-janus:
./srt-janus :8090 ws://127.0.0.1:8188
Then fire up ffmpeg:
ffmpeg -re -i /path/to/some/file \
-c:v libx264 \
-profile:v baseline \
-b:v 1000k \
-bsf:v h264_mp4toannexb \
-c:a aac \
-b:a 96k \
-ar 48000 \
-ac 2 \
-g 30 \
-f mpegts \
'srt://127.0.0.1:8090?streamid=1234'
If your ffmpeg doesn't have SRT enabled, you can use UDP instead and forward with srt-live-transmit:
srt-live-transmit udp://127.0.0.1:9999 srt://127.0.0.1:8090?streamid=1234 &
ffmpeg (arguments-from-above) udp://127.0.0.1:9999?pkt_size=1316
Your audio+video will appear in Janus as a member of the videoroom!
- Figure out what events from Janus I should handle (I just blast audio/video).
- Test this with a bad connection, like something that randomly drops UDP packets.
- See if I can support VP8 as well.
MIT (see LICENSE)