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audiotestsrc - GStreamer
https://gstreamer.freedesktop.org/documentation/audiotestsrc/index.html
audiotestsrc AudioTestSrc can be used to generate basic audio signals. It support several different waveforms and allows to set the base frequency and volume. Some waveforms might use additional properties. Waveform specific notes: Gaussian white noise This waveform produces white (zero mean) Gaussian noise.
videotestsrc - GStreamer
https://gstreamer.freedesktop.org/documentation/videotestsrc/index.html
By default the videotestsrc will generate data indefinitely, but if the num-buffers property is non-zero it will instead generate a fixed number of video frames and then send EOS. Example launch line gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink Shows random noise in a video window.
gstreamer - gst-launch-1.0 videotestsrc ! autovideosink ...
https://stackoverflow.com/questions/57754353/gst-launch-1-0-videotestsrc-autovideosink-does-not-work-for-me
Got the same issue with you: autovideosink can play video but doesn't display it in a window. Try: gst-launch-1.0 videotestsrc ! ximagesink. Also, glimagesink works for us.
Python GStreamer Tutorial - GitHub Pages
https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html
gst-launch-1.0 audiotestsrc ! alsasink videotestsrc ! xvimagesink Or, you can make a single frame JPEG gst-launch-1.0 videotestsrc num-buffers=1 ! jpegenc ! If you are using the "name" property you may use the same element more than once. Just put a "." after its name, eg with oggmux here. gst-launch-1.0 audiotestsrc ! vorbisenc ! oggmux name=mux !
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