2.5 KiB
Test streams (GStreamer command-line cheat sheet)
Video test streams
Display a test pattern
The videotestsrc element creates test patterns. Display locally like this:
gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink
This should display the test pattern in a window, that looks a bit like this:
There are multiple test patterns available, such as:
| Pattern | Example |
|---|---|
videotestsrc pattern=snow |
 |
videotestsrc pattern=red (and blue, green, white and black) |
 |
videotestsrc pattern=pinwheel |
 |
videotestsrc pattern=smpte100 (color test bars) |
 |
videotestsrc pattern=colors |
 |
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
Change the shape of a test pattern
To change the width and/or height, pass width and height immediately afterwards, e.g.
gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink
Audio test streams
Listen to a test audio (beep)
The element audiotestsrc can make a variety of test sounds:
gst-launch-1.0 audiotestsrc ! autoaudiosink
You can change the pitch using the freq property:
# This creates a higher beep:
gst-launch-1.0 audiotestsrc freq=1000 ! autoaudiosink
The mixing page shows how two different frequency audio test streams can be mixed together.
You can change the volume by setting the volume property between 0 and 1. E.g. for a quiet beep:
gst-launch-1.0 audiotestsrc volume=0.1 ! autoaudiosink
### White noise
Set wave to white-noise:
gst-launch-1.0 audiotestsrc wave="white-noise" ! autoaudiosink
There are variations (e.g. red noise) - see the docs for a complete list.
### Silence
If you need an audio stream with nothing in:
gst-launch-1.0 audiotestsrc wave="silence" ! autoaudiosink
Combining audio and video test streams
Combine both the test pattern and test audio:
gst-launch-1.0 audiotestsrc ! autoaudiosink videotestsrc ! autovideosink