videotestsrc

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.

By default the videotestsrc will generate data indefinitely, but if the num-buffers property is non-zero it will instead generate a fixed number of video frames and then send EOS.

Example launch line

 gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink

Shows random noise in a video window.

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBaseSrc
                    ╰──GstPushSrc
                        ╰──videotestsrc

Factory details

Authors: – David A. Schleef

Classification:Source/Video

Rank – none

Plugin – gstvideotestsrc

Package – GStreamer Base Plug-ins git

Pad Templates

src

video/x-raw:
         format: { I420, YV12, YUY2, UYVY, AYUV, VUYA, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, Y210, Y410, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, BGR10A2_LE, RGB10A2_LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GRAY10_LE32, NV12_10LE32, NV16_10LE32, NV12_10LE40 }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 multiview-mode: { (string)mono, (string)left, (string)right }
video/x-bayer:
         format: { bggr, rggb, grbg, gbrg }
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 multiview-mode: { (string)mono, (string)left, (string)right }

Presencealways

Directionsrc


Properties

animation-mode

“animation-mode” Video-test-src-animation-mode

For pattern=ball, which counter defines the position of the ball.

Flags : Read / Write

Default value : frames (0)


background-color

“background-color” guint

Color to use for background color of some patterns. Default is black (0xff000000).

Flags : Read / Write

Default value : -16777216


blocksize

“blocksize” guint

Size in bytes to read per buffer (-1 = default)

Flags : Read / Write

Default value : 4096


do-timestamp

“do-timestamp” gboolean

Apply current stream time to buffers

Flags : Read / Write

Default value : false


flip

“flip” gboolean

For pattern=ball, invert colors every second.

Flags : Read / Write

Default value : false


foreground-color

“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 : -1


horizontal-speed

“horizontal-speed” gint

Scroll image number of pixels per frame (positive is scroll to the left)

Flags : Read / Write

Default value : 0


is-live

“is-live” gboolean

Whether to act as a live source

Flags : Read / Write

Default value : false


k0

“k0” gint

Zoneplate zero order phase, for generating plain fields or phase offsets

Flags : Read / Write

Default value : 0


kt

“kt” gint

Zoneplate 1st order t phase, for generating phase rotation as a function of time

Flags : Read / Write

Default value : 0


kt2

“kt2” gint

Zoneplate 2nd order t phase, t*t/256 cycles per picture

Flags : Read / Write

Default value : 0


kx

“kx” gint

Zoneplate 1st order x phase, for generating constant horizontal frequencies

Flags : Read / Write

Default value : 0


kx2

“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

“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


kxy

“kxy” gint

Zoneplate x*y product phase

Flags : Read / Write

Default value : 0


ky

“ky” gint

Zoneplate 1st order y phase, for generating contant vertical frequencies

Flags : Read / Write

Default value : 0


ky2

“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


kyt

“kyt” gint

Zoneplate y*t product phase

Flags : Read / Write

Default value : 0


motion

“motion” Video-test-src-motion-type

For pattern=ball, what motion the ball does

Flags : Read / Write

Default value : wavy (0)


name

“name” gchararray

The name of the object

Flags : Read / Write / Construct

Default value : NULL


num-buffers

“num-buffers” gint

Number of buffers to output before sending EOS (-1 = unlimited)

Flags : Read / Write

Default value : -1


parent

“parent” GstObject *

The parent of the object

Flags : Read / Write


pattern

“pattern” Video-test-src-pattern

Type of test pattern to generate

Flags : Read / Write

Default value : smpte (0)


timestamp-offset

“timestamp-offset” gint64

An offset added to timestamps set on buffers (in ns)

Flags : Read / Write

Default value : 0


typefind

“typefind” gboolean

Run typefind before negotiating (deprecated, non-functional)

Flags : Read / Write

Default value : false


xoffset

“xoffset” gint

Zoneplate 2nd order products x offset

Flags : Read / Write

Default value : 0


yoffset

“yoffset” gint

Zoneplate 2nd order products y offset

Flags : Read / Write

Default value : 0


Named constants

Video-test-src-animation-mode

Members

frames (0) – frame count
wall-time (1) – wall clock time
running-time (2) – running time

Video-test-src-motion-type

Members

wavy (0) – Ball waves back and forth, up and down
sweep (1) – 1 revolution per second
hsweep (2) – 1/2 revolution per second, then reset to top

Video-test-src-pattern

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.

Members

smpte (0) – SMPTE 100%% color bars
snow (1) – Random (television snow)
black (2) – 100%% Black
white (3) – 100%% White
red (4) – Red
green (5) – Green
blue (6) – Blue
checkers-1 (7) – Checkers 1px
checkers-2 (8) – Checkers 2px
checkers-4 (9) – Checkers 4px
checkers-8 (10) – Checkers 8px
circular (11) – Circular
blink (12) – Blink
smpte75 (13) – SMPTE 75%% color bars
zone-plate (14) – Zone plate
gamut (15) – Gamut checkers
chroma-zone-plate (16) – Chroma zone plate
solid-color (17) – Solid color
ball (18) – Moving ball
smpte100 (19) – SMPTE 100%% color bars
bar (20) – Bar
pinwheel (21) – Pinwheel
spokes (22) – Spokes
gradient (23) – Gradient
colors (24) – Colors

The results of the search are