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# rtp-forwarder
rtp-forwarder is a simple application that shows how to forward your webcam/microphone via RTP using Pion WebRTC.
## Instructions
### Download rtp-forwarder
```
go install github.com/pion/webrtc/v4/examples/rtp-forwarder@latest
```
### Open rtp-forwarder example page
[jsfiddle.net](https://jsfiddle.net/fm7btvr3/) you should see your Webcam, two text-areas and `Copy browser SDP to clipboard`, `Start Session` buttons
### Run rtp-forwarder, with your browsers SessionDescription as stdin
In the jsfiddle the top textarea is your browser's Session Description. Press `Copy browser SDP to clipboard` or copy the base64 string manually.
We will use this value in the next step.
#### Linux/macOS
Run `echo $BROWSER_SDP | rtp-forwarder`
#### Windows
1. Paste the SessionDescription into a file.
1. Run `rtp-forwarder < my_file`
### Input rtp-forwarder's SessionDescription into your browser
Copy the text that `rtp-forwarder` just emitted and copy into second text area
### Hit 'Start Session' in jsfiddle and enjoy your RTP forwarded stream!
You can run any of these commands at anytime. The media is live/stateless, you can switch commands without restarting Pion.
#### VLC
Open `rtp-forwarder.sdp` with VLC and enjoy your live video!
#### ffmpeg/ffprobe
Run `ffprobe -i rtp-forwarder.sdp -protocol_whitelist file,udp,rtp` to get more details about your streams
Run `ffplay -i rtp-forwarder.sdp -protocol_whitelist file,udp,rtp` to play your streams
You can add `-fflags nobuffer -flags low_delay -framedrop` to lower the latency. You will have worse playback in networks with jitter. Read about minimizing the delay on [Stackoverflow](https://stackoverflow.com/a/49273163/5472819).
#### Twitch/RTMP
`ffmpeg -protocol_whitelist file,udp,rtp -i rtp-forwarder.sdp -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv rtmp://live.twitch.tv/app/$STREAM_KEY` Make sure to replace `$STREAM_KEY` at the end of the URL first.