python-opencv-gstreamer-examples

Python examples for grabbing video devices (e.g. webcam, video, ...) and interacting with GStreamer (Shared Memory, RTP Stream).

Preliminars for Ubuntu 16.04.4 LTS
- Install GStreamer (apt-get install gstreamer1.0* libgstreamer-plugins-bad1.0-0 libgstreamer-plugins-base1.0-0 libgstreamer-plugins-base1.0-dev libgstreamer1.0 libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk-3-dev)
- optional FFMPEG, QT
- Build OpenCV > 3 without gstreamer 0.10 support: -D WITH_GSTREAMER=ON -D WITH_GSTREAMER_0_10=OFF

Usage

Test if installation was successful: gst-launch-1.0 v4l2src ! xvimagesink. You should see your webcam's image.
gst_device_to_shm grabs the VideoCapture(0) and puts the raw image in a shared memory. Mind here to define your own webcam properties.
gst_shm_to_app grabs the shared memory frame from gst_device_to_shm and pipes it to a VideoCapture.
gst_device_to_rtp grabs the VideoCapture(0),encodes the frame and streams it to rtp://localhost:5000
gst_shm_to_rtp grabs the shared memory frame from gst_device_to_shm ,encodes the frame and streams it to rtp://localhost:5000.