NVIDIA VPI GStreamer Plug-in/Examples/Videoscale

GstVPI
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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.

Videoscale 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"

NVIDIA VPI GStreamer Plug-in Videoscale 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