Tutorial 1. Playing video

It's very simple. One line is enough to play the video.
We will simply run the pipeline using the gst-launch tool.

Prerequisites

# Install GStreamer packages for Tutorial 1 and later use.
$ sudo apt install gstreamer1.0-tools gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad

Playing video!

$ gst-launch-1.0 v4l2src ! videoconvert ! videoscale ! video/x-raw, width=640, height=480, framerate=30/1 ! autovideosink
# If you don't have a camera device, use `videotestsrc`.
$ gst-launch-1.0 videotestsrc ! videoconvert ! videoscale ! video/x-raw, width=640, height=480, framerate=30/1 ! autovideosink

That's all!
Change the width, height, and frame rate of the video.
Now that we're close to GStreamer, let's move on to nnstreamer tutorials.

Additional description for used elements.

Use the gst-inspect-1.0 tool for more information of the element.

$ gst-inspect-1.0 videoconvert
Factory Details:
  Rank                     none (0)
  Long-name                Colorspace converter
  Klass                    Filter/Converter/Video
  Description              Converts video from one colorspace to another
...

• v4l2src: Reads frames from a linux video device.
• videotestsrc: Creates a test video stream.
• videoconvert: Converts video format.
• videoscale: Resizes video.
• autovideosink: Automatically detects video sink.