Found a reference to GStreamer on a VLC bugreport, tried it today. RTSP camera latency went from 1140ms (with built-in Media source) through 400ms (with VLC Video Source) to 60ms!!!!!!!!!! with GStreamer Source!!!! Just came here to spread the good news!
An OBS Studio source plugin to feed GStreamer launch pipelines into OBS Studio. This plugin has interesting use cases but may be difficult to understand and is clunky use if you are not familiar with GStreamer. Experimental prebuilt 64 Bit...
Copy obs-gstreamer.dll from https://github.com/fzwoch/obs-gstreamer/releases/download/v0.1.0/obs-gstreamer.zip
(\windows) to PathToOpenBroadcasterSoftware\obs-plugins\64bit\
and install. Put PathTo\gstreamer\1.0\mingw_x86_64\bin\ into PATH (or copy libglib-2.0-0.dll, libgobject-2.0-0.dll, libgstapp-1.0-0.dll, libgstaudio-1.0-0.dll, libgstreamer-1.0-0.dll, libgstvideo-1.0-0.dll to PathToOpenBroadcasterSoftware\bin\64bit\, based on https://github.com/fzwoch/obs-gstreamer/issues/13#issuecomment-711106142
but this I have not tried yet...)
Start OBS and add GStreamer Source. We use HikVision IP cameras, my Pipeline looks like this:
uridecodebin uri=rtsp://username:password@ipaddress/Streaming/Channels/1 name=bin ! queue ! video.
Important to uncheck Sync appsinks to clock, and to my surprise the feed in OBS is lower latency than the feed in Internet Explorer.
Live test on Sunday.