Doc: Improve rtmp

docusaurus/video/docusaurus/docs/api/streaming/rtmp.mdx

@@ -69,3 +69,28 @@ print(rtmp_url, stream_key)
 The user(s) streaming from the third-party software will show up as regular users in the call.
 
 You can see an example in the [Quickstart](../../streaming/overview/#test-sending-video-via-rtmp-using-obs).
+
+### Streaming into a call with OBS
+
+1. Open OBS and go to `Settings` (CMD + , on macOS).
+2. Set the `Stream Type` to `Custom`.
+3. Set the `URL` to the `rtmp_url` you got from the API.
+4. Set the `Stream Key` to the `stream_key` you got from the API.
+
+<img
+  src={require('../assets/rtmp_obs_settings.png').default}
+  style={{ width: '100%' }}
+/>
+
+### Streaming into a call with restream.io
+
+1. Go to [restream.io](https://restream.io/) and create an account.
+2. For streaming to a custom RTMP server, you need to have a paid account.
+3. Add a new channel and select `Custom RTMP`.
+4. Set the `Server` to the `rtmp_url` you got from the API.
+5. Set the `Stream Key` to the `stream_key` you got from the API.
+
+<img
+  src={require('../assets/rtmp_restream_settings.png').default}
+  style={{ width: '50%' }}
+/>