List needed gstreamer plugins explicitly

README.md

@@ -126,8 +126,11 @@ brew cask install nheko
 - [libolm](https://gitlab.matrix.org/matrix-org/olm)
 - [spdlog](https://github.com/gabime/spdlog)
 - [GStreamer](https://gitlab.freedesktop.org/gstreamer) 1.18.0 or greater (optional, needed for VoIP support).
-    - gstreamer core library, gst-plugins-base, gst-plugins-good & gst-plugins-bad
-    - qmlgl plugin (optional, needed for video call support)
+    - Installing the gstreamer core library plus gst-plugins-base, gst-plugins-good & gst-plugins-bad
+      is often sufficient. The qmlgl plugin though is often packaged separately. The actual plugin requirements
+      are as follows:
+    - Voice call support: dtls, opus, rtpmanager, srtp, webrtc
+    - Video call support (optional): compositor, opengl, qmlgl, rtp, vpx
     - [libnice](https://gitlab.freedesktop.org/libnice/libnice)
 - A compiler that supports C++ 17:
     - Clang 6 (tested on Travis CI)