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88 lines
2.5 KiB
Markdown
88 lines
2.5 KiB
Markdown
# Test streams (GStreamer command-line cheat sheet)
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## Video test streams
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### Display a test pattern
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The `videotestsrc` element creates test patterns. Display locally like this:
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```
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gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink
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```
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This should display the test pattern in a window, that looks a
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bit like this:
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![Test pattern window](images/test-pattern.png "Test pattern window")
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There are multiple test patterns available, such as:
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| Pattern | Example |
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| ------------- |:-------------:|
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| `videotestsrc pattern=snow` | ![](images/test_snow.png) |
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| `videotestsrc pattern=red` (and blue, green, white and black) | ![](images/test_red.png) |
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| `videotestsrc pattern=pinwheel` | ![](images/test_pinwheel.png) |
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| `videotestsrc pattern=smpte100` (color test bars) | ![](images/test_smpte100.png) |
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| `videotestsrc pattern=colors` | ![](images/test_colors.png) |
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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
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### Change the shape of a test pattern
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To change the width and/or height, pass width and height immediately afterwards, e.g.
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```
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gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink
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```
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## Audio test streams
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### Listen to a test audio (beep)
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The element `audiotestsrc` can make a variety of test sounds:
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```
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gst-launch-1.0 audiotestsrc ! autoaudiosink
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```
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You can change the pitch using the `freq` property:
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```
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# This creates a higher beep:
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gst-launch-1.0 audiotestsrc freq=1000 ! autoaudiosink
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```
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The [mixing page](./mixing.md) shows how two different frequency audio test streams can be mixed together.
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You can change the *volume* by setting the `volume` property between `0` and `1`. E.g. for a quiet beep:
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```
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gst-launch-1.0 audiotestsrc volume=0.1 ! autoaudiosink
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```
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### White noise
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Set `wave` to `white-noise`:
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```
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gst-launch-1.0 audiotestsrc wave="white-noise" ! autoaudiosink
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```
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There are variations (e.g. _red noise_) - see the [docs](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-audiotestsrc.html) for a complete list.
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### Silence
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If you need an audio stream with nothing in:
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```
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gst-launch-1.0 audiotestsrc wave="silence" ! autoaudiosink
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```
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## Combining audio and video test streams
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Combine both the test pattern and test audio:
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```
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gst-launch-1.0 audiotestsrc ! autoaudiosink videotestsrc ! autovideosink
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```
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