Tested with UE4 4.26 and GStreamer 1.18.4
Download and install GStreamer runtime and development packages
Edit Plugins\GStreamer\Source\GStreamer\GStreamer.Build.cs
Modify const string GStreamerRoot = @"C:\gstreamer_development\1.0\msvc_x86_64" to path where development package installed
Set environment variable GSTREAMER_ROOT=C:\gstreamer_runtime\1.0\msvc_x86_64 to path where runtime package installed
Launch project and hit play
Test pattern:
videotestsrc pattern=snow ! video/x-raw,width=(int)512,height=(int)512,format=(string)RGBA,framerate=(fraction)30/1 ! appsink name=sink
Play a local file:
filesrc location=d:/video/doom.mp4 ! decodebin ! videoconvert ! video/x-raw,format=(string)RGBA ! videoconvert ! appsink name=sink
Play URI:
uridecodebin uri=http://images.nvidia.com/geforce-com/international/videos/doom/doom-nvidia-geforce-gtx-geforce-dot-com-vulkan-graphics-api-gameplay-video.mp4 ! videoconvert ! video/x-raw,format=(string)RGBA ! videoconvert ! appsink name=sink
Capture and stream render target:
appsrc name=src caps=video/x-raw,width=(int)640,height=(int)480,format=(string)BGRA,framerate=(fraction)60/1 ! tcpserversink host=127.0.0.1 port=5000 sync=false
Preview stream:
gst-launch-1.0 -v tcpclientsrc host=127.0.0.1 port=5000 ! videoparse width=640 height=480 framerate=60/1 format=8 ! autovideoconvert ! autovideosink