NVIDIA VPI GStreamer Plug-in/Examples/Videoscale

GstVPI
GstVPI Basics
Getting Started
Evaluating GstVPI Getting the Code Building the Plugin
Examples
Gaussian Filter Undistort Harris Keypoints Detector KLT Tracker Perspective Warp Overlay Videoconvert Videoscale Convolution Separable Convolution
Performance
Nano TX1 TX2 Xavier
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Introduction

The vpivideoscale element applies the Rescale algorithm in order to rescale video from one resolution to another using VPI.

Element properties

• backend
  

Backend to use to execute VPI algorithms. Available options:

cpu: CPU backend

cuda: CUDA backend

pva: PVA backend (Xavier only)

vic: VIC backend

Flags: readable, writable
Default: "cuda"

• interpolator
  

Interpolation method to be used. Available options:

nearest: Nearest neighbor interpolation

linear: Fast linear interpolation

catmull: Fast Catmull-Ron cubic interpolation

Flags: readable, writable
Default: linear

• boundary
  

How pixel values outside of the image domain should be treated. Available options:

zero: All pixels outside the image are considered 0

clamp: Border pixels are repeated indefinitely

reflect: Pixels are reflected like this edcba|abcde|edcba

mirror: Pixels are mirrored like this dedcb|abcde|dcbab

Flags: readable, writable
Default: "zero"

Example

The following example pipe will help you rescale the input video stream from 1080P to 720P. You may modify the properties values according to the information above.

• Unified memory

gst-launch-1.0 videotestsrc is-live=true ! video/x-raw,width=1920,height=1080 ! vpiupload ! vpivideoscale ! "video/x-raw(memory:VPIImage),width=1280,height=720" ! vpidownload ! fakesink

• NVMM memory

gst-launch-1.0 videotestsrc is-live=true ! nvvidconv bl-output=false ! video/x-raw(memory:NVMM),width=1920,height=1080 ! vpiupload ! vpivideoscale ! "video/x-raw(memory:VPIImage),width=1280,height=720" ! vpidownload ! fakesink