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webrtc: README: add webrtcsink-custom-signaller.py

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Document the Python webrtcsink custom signaller example.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1888>
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net/webrtc/examples/README.md
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@ -17,10 +17,49 @@ cargo run --example webrtcsink-stats-server
Once it is running, follow the instruction in the webrtcsink-stats folder to
run an example client.
## webrtcsink-custom-signaller
## Rust webrtcsink-custom-signaller
An example of custom signaller implementation, see the corresponding
[README](webrtcsink-custom-signaller/README.md) for more details on code and usage.
An example of a custom signaller implementation in Rust, see the corresponding
[README](webrtcsink-custom-signaller/README.md) for more details on code and
usage.
## Python webrtcsink-custom-signaller
An example of a webrtcsink producer and custom signaller implemented in Python,
see [webrtcsink-custom-signaller.py](webrtcsink-custom-signaller.py). Running
the example requires the Python GStreamer bindings and the websockets library.
To install these in Debian/Ubuntu:
``` shell
sudo apt install python3-gst-1.0 python3-websockets
```
Running the Python example is similar to the process described in "[README:
Usage (standalone services)](../README#usage-standalone-services)", except
in the third step `gst-launch-1.0` is replaced with the Python program. Open
three terminals. In the first one, run the signalling server:
``` shell
cd net/webrtc/signalling
WEBRTCSINK_SIGNALLING_SERVER_LOG=debug cargo run --bin gst-webrtc-signalling-server
```
In the second one, run a web browser client:
``` shell
cd net/webrtc/gstwebrtc-api
npm install
npm start
```
In the third one, run the Python code:
``` shell
# The Python code contains a hardcoded GStreamer pipeline, so unlike
# gst-launch-1.0, there is no need to pass any extra arguments
export GST_PLUGIN_PATH=<path-to-gst-plugins-rs>/target:${GST_PLUGIN_PATH}
python3 net/webrtc/examples/webrtcsink-custom-signaller.py
```
## WebRTC precise synchronization example