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:

![Test pattern window](images/test-pattern.png "Test pattern window")

There are multiple test patterns available, such as

| Pattern        | Example           |
| ------------- |:-------------:|
| `videotestsrc pattern=snow`  | ![](images/test_snow.png) |
| `videotestsrc pattern=red` (and blue, green, white and black) | ![](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
```