gstreamer-cheat-sheet/test_streams.md

Test streams (GStreamer command-line cheat sheet)

### Display a test pattern

gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink

This should display the test pattern in a window, that looks a bit like this:

Colons can be used to align columns.

Tables	Are	Cool
col 3 is	right-aligned	$1600
col 2 is	centered	$12
zebra stripes	are neat	$1

There must be at least 3 dashes separating each header cell. The outer pipes (|) are optional, and you don't need to make the raw Markdown line up prettily. You can also use inline Markdown.

Markdown	Less	Pretty
Still	renders	nicely
1	2	3

There are multiple test patterns available, such as

Pattern	Example
videotestsrc pattern=snow
videotestsrc pattern=red (and blue and green)	!(images/test_red.png)
videotestsrc pattern=red (and blue and green)	!(images/test_red.png)
videotestsrc pattern=pinwheel	!(images/test_pinwheel.png)
videotestsrc pattern=smpte100 (color test bars)	!(images/test_smpte100.png)
videotestsrc pattern=colors	!(images/test_colors.png)

For the full list of patterns, see https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videotestsrc.html

### Listen to a test audio (beep)

gst-launch-1.0 audiotestsrc ! audioconvert ! autoaudiosink

Combine both the test pattern and test audio:

gst-launch-1.0 audiotestsrc ! autoaudiosink videotestsrc ! autovideosink