update documentation (#4914)

docs/2-usage/4-read.md

@@ -17,6 +17,7 @@ We provide instructions for reading with the following software:
 - [FFmpeg](#ffmpeg)
 - [GStreamer](#gstreamer)
 - [VLC](#vlc)
+- [OBS Studio](#obs-studio)
 - [Unity](#unity)
 - [Web browsers](#web-browsers)
 
@@ -276,6 +277,18 @@ snap install vlc
 
 At the moment VLC doesn't support reading encrypted RTSP streams. However, you can use a proxy like [stunnel](https://www.stunnel.org) or [nginx](https://nginx.org/) or a local _MediaMTX_ instance to decrypt streams before reading them.
 
+### OBS Studio
+
+OBS Studio can read streams from the server by using the [RTSP protocol](#rtsp).
+
+Open OBS, click on _Add Source_, _Media source_, _OK_, uncheck _Local file_, insert in _Input_:
+
+```
+rtsp://localhost:8554/stream
+```
+
+Then _Ok_.
+
 ### Unity
 
 Software written with the Unity Engine can read a stream from the server by using the [WebRTC protocol](#webrtc).

docs/2-usage/6-authentication.md

@@ -166,6 +166,8 @@ These are the recommended methods for each client:
 | GStreamer    | RTMP     | Query parameter       |                                                                                                                                                                    |
 | any          | SRT      | unsupported           | SRT truncates passwords and query parameters to 512 characters, so it's impossible to use SRT+JWT. See [#3430](https://github.com/bluenviron/mediamtx/issues/3430) |
 
+### Keycloak setup
+
 Here's a tutorial on how to setup the [Keycloak identity server](https://www.keycloak.org/) in order to provide JWTs:
 
 1. Start Keycloak: