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GstVideoTestSrcPattern | pattern | Read / Write |
gint64 | timestamp-offset | Read / Write |
gboolean | is-live | Read / Write |
gboolean | peer-alloc | Read / Write |
GstVideoTestSrcColorSpec | colorspec | Read / Write |
gint | k0 | Read / Write |
gint | kt | Read / Write |
gint | kt2 | Read / Write |
gint | kx | Read / Write |
gint | kx2 | Read / Write |
gint | kxt | Read / Write |
gint | kxy | Read / Write |
gint | ky | Read / Write |
gint | ky2 | Read / Write |
gint | kyt | Read / Write |
gint | xoffset | Read / Write |
gint | yoffset | Read / Write |
guint | background-color | Read / Write |
guint | foreground-color | Read / Write |
gint | horizontal-speed | Read / Write |
GObject ╰── GstObject ╰── GstElement ╰── GstBaseSrc ╰── GstPushSrc ╰── GstVideoTestSrc
The videotestsrc element is used to produce test video data in a wide variety of formats. The video test data produced can be controlled with the "pattern" property.
The test pattern to produce.
The Gamut pattern creates a checkerboard pattern of colors at the edge of the YCbCr gamut and nearby colors that are out of gamut. The pattern is divided into 4 regions: black, white, red, and blue. After conversion to RGB, the out-of-gamut colors should be converted to the same value as their in-gamut neighbors. If the checkerboard pattern is still visible after conversion, this indicates a faulty conversion. Image manipulation, such as adjusting contrast or brightness, can also cause the pattern to be visible.
The Zone Plate pattern is based on BBC R&D Report 1978/23, and can be used to test spatial frequency response of a system. This pattern generator is controlled by the xoffset and yoffset parameters and also by all the parameters starting with 'k'. The default parameters produce a grey pattern. Try 'videotestsrc pattern=zone-plate kx2=20 ky2=20 kt=1' to produce something interesting.
A standard SMPTE test pattern |
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Random noise |
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A black image |
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A white image |
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A red image |
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A green image |
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A blue image |
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Checkers pattern (1px) |
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Checkers pattern (2px) |
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Checkers pattern (4px) |
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Checkers pattern (8px) |
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Circular pattern |
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Alternate between black and white |
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SMPTE test pattern (75% color bars) |
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Zone plate |
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Gamut checking pattern |
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Chroma zone plate |
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Moving ball |
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SMPTE test pattern (100% color bars) |
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Bar with foreground color |
“pattern”
property“pattern” GstVideoTestSrcPattern
Type of test pattern to generate.
Flags: Read / Write
Default value: SMPTE 100% color bars
“timestamp-offset”
property “timestamp-offset” gint64
An offset added to timestamps set on buffers (in ns).
Flags: Read / Write
Default value: 0
“is-live”
property “is-live” gboolean
Whether to act as a live source.
Flags: Read / Write
Default value: FALSE
“peer-alloc”
property “peer-alloc” gboolean
Ask the peer to allocate an output buffer.
Flags: Read / Write
Default value: TRUE
“colorspec”
property“colorspec” GstVideoTestSrcColorSpec
Generate video in the given color specification (Deprecated: use a caps filter with video/x-raw-yuv,color-matrix="sdtv" or "hdtv" instead).
Flags: Read / Write
Default value: ITU-R Rec. BT.601
“k0”
property “k0” gint
Zoneplate zero order phase, for generating plain fields or phase offsets.
Flags: Read / Write
Default value: 0
“kt”
property “kt” gint
Zoneplate 1st order t phase, for generating phase rotation as a function of time.
Flags: Read / Write
Default value: 0
“kt2”
property “kt2” gint
Zoneplate 2nd order t phase, t*t/256 cycles per picture.
Flags: Read / Write
Default value: 0
“kx”
property “kx” gint
Zoneplate 1st order x phase, for generating constant horizontal frequencies.
Flags: Read / Write
Default value: 0
“kx2”
property “kx2” gint
Zoneplate 2nd order x phase, normalised to kx2/256 cycles per horizontal pixel at width/2 from origin.
Flags: Read / Write
Default value: 0
“kxt”
property “kxt” gint
Zoneplate x*t product phase, normalised to kxy/256 cycles per vertical pixel at width/2 from origin.
Flags: Read / Write
Default value: 0
“ky”
property “ky” gint
Zoneplate 1st order y phase, for generating contant vertical frequencies.
Flags: Read / Write
Default value: 0
“ky2”
property “ky2” gint
Zoneplate 2nd order y phase, normailsed to ky2/256 cycles per vertical pixel at height/2 from origin.
Flags: Read / Write
Default value: 0
“xoffset”
property “xoffset” gint
Zoneplate 2nd order products x offset.
Flags: Read / Write
Default value: 0
“yoffset”
property “yoffset” gint
Zoneplate 2nd order products y offset.
Flags: Read / Write
Default value: 0
“background-color”
property “background-color” guint
Color to use for background color of some patterns. Default is black (0xff000000).
Flags: Read / Write
Default value: 4278190080
Since: 0.10.31
“foreground-color”
property “foreground-color” guint
Color to use for solid-color pattern and foreground color of other patterns. Default is white (0xffffffff).
Flags: Read / Write
Default value: 4294967295
Since: 0.10.31