Gst-nvvideotestsrc#

The Gst-nvvideotestsrc plugin uses CUDA to generate video test data in a variety of formats and patterns that is written directly to GPU output buffers using the video/x-raw(memory:NVMM) data type.

The plugin can also be used to input raw video and generate GPU buffers at the output. The plugin provides properties to introduce jitter in buffer latencies which can be used to simulate network conditions locally.

Note

The Gst-nvvideotestsrc plugin is currently only supported on X86.

Outputs#

This section summarizes the outputs of the Gst-nvvideotestsrc plugin.

  • Output

    • Gst Buffer with a test pattern

    • Video Format: NV12, I420, RGBA (NVMM)

  • Control parameters

    • gpu-id

    • animation-mode

    • memtype

    • blocksize

    • pattern

Gst Properties#

The following tables describes the Gst properties of the Gst-nvvideotestsrc plugin.

nvvideotestsrc plugin properties#

Property

Meaning

Type and Range

Example notes

animation-mode

For animating patterns, the counter that controls the animation.

Enum “GstNvVideoTestSrcAnimationMode” Default: 0, “frames”

(0): frames - Frame count

(1): wall-time - Wall clock time

(2): running-time - Running time

animation-mode=0

blocksize

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

Unsigned Integer. Range: 0 - 4294967295 Default: 4096

blocksize=4096

gpu-id

ID of the GPU where the buffers are allocated

Unsigned Integer. Range: 0 - 2147483647 Default: 0

gpu-id=0

num-buffers

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

Integer. Range: -1 - 2147483647 Default: -1

num-buffers=300

pattern

Type of test pattern to generate

Enum “GstNvVideoTestSrcPattern” Default: 0, “smpte”

(0): smpte - SMPTE color bars

(1): mandelbrot - Mandelbrot set

(2): gradient - Gradient

pattern=1

memtype

Type of the memory used for the allocated buffers

Enum “NvBufSurfaceMemType” Default: 2, “Device CUDA memory”

(1): Host/Pinned CUDA memory - host

(2): Device CUDA memory - device

(3): Unified CUDA memory - unified

memtype=2

do-timestamp

Apply current stream time to buffers

Boolean. Default: false

do-timestamp=true

is-live

Whether to act as a live source. Introduces latency based on FPS setting on src caps

Boolean. Default: false

is-live=true

location

File location for raw video file input. When file location is not specified, pattern gets used.

String. Default: NULL

location=test.rgba

file-loop

Loop through the input file until num-buffers (if specified) or infinitely

Boolean. Default: false

file-loop=true

max-jitter

Maximum jitter (in milliseconds) that can be applied to each buffer. Only applicable when is-live=true. A random jitter ranging up to “max-jitter” gets applied to each buffer.

Integer, ≥0 Default: 0

max-jitter=100

fixed-jitter

List of fixed jitter values (in milliseconds). The list will be looped through for the entire sequence. Only applicable when is-live=true. If “fixed-jitter” is specified “max-jitter”(if specified) is ignored.

Semicolon delimited integer array. all values ≥0. Default: “”

fixed-jitter=30;40;100;0;0

How to test#

nvvideotestsrc is currently supported for X86 only. support with “Jetson + dGPU” is not yet enabled.

Run following reference gst-launch-1.0 pipeline on DGPU setup.

  1. Default SMPTE Pattern - 720p 60Hz

gst-launch-1.0 nvvideotestsrc ! queue ! nveglglessink -e

  1. Mandelbrot Pattern - 1080p 60Hz

    gst-launch-1.0 nvvideotestsrc pattern=mandelbrot ! 'video/x-raw(memory:NVMM), width=1920, height=1080, framerate=60/1' ! queue ! nveglglessink -e

  2. Gradient Pattern - 720p 60Hz

gst-launch-1.0 gst-launch-1.0 nvvideotestsrc pattern=2 ! queue ! nveglglessink -e
On this page