For hands-on information see gstreamer.md

mat2gstreamer

Open camera by OpenCV and send it to UDP/RTP

Preliminars for Ubuntu 14.04
- Install gstreamer1.0 and 0.10: `add-apt-repository ppa:mc3man/gstffmpeg-keep && apt-get update && apt-get install libgstreamer1.0* gstreamer1.0* libgstreamer0.10* gstreamer0.10*``
- Build opencv without gstreamer 0.10 support: -D WITH_GSTREAMER=ON -D WITH_GSTREAMER_0_10=OFF
Configure the source code: Maybe you have another cameradevice, etc.
Build: cmake . && make
Run a standalone gstreamer udtsrc and display the video strea (sampling, depth, width, and height might differ): gst-launch-1.0 -v udpsrc port=5000 caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW, sampling=(string)BGR, depth=(string)8, width=(string)640, height=(string)480" ! rtpvrawdepay ! videoconvert ! ximagesink
Notes
- If the caps string is not correct, just open up a gstreamer udpsink for you webcam and investigate the caps section of the verbose output. This string needs to be put into the caps section of the udpsrc
- Do not use gstreamer0.10

Hints

Webcam example: gst-launch-1.0 v4l2src ! xvimagesink
Get debug messages of gst-launch-1.0 with argument --gst-debug-level=5
List available plugins: gst-inspect-1.0
List features of a plugin: gst-inspect-1.0 <PLUGIN_NAME>
videoconvert feature:
- https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videoconvert.html
- This will output a test video (generated in YUY2 format) in a video window. If the video sink selected does not support YUY2 videoconvert will automatically convert the video to a format understood by the video sink: gst-launch-1.0 -v videotestsrc ! video/x-raw,format=YUY2 ! videoconvert ! autovideosink
Plugin description: https://gstreamer.freedesktop.org/documentation/

Open camera by OpenCV and send it to gstreamer

GNU General Public License v3.0

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