VPI-4.0.5

This VPI version supports

Jetson AGX Thor DevKit
Jetson AGX Thor T5000 and T4000
IGX Thor DevKit + Blackwell RTX6000 dGPU
IGX Thor T7000 and T5000
IGX Thor Safety DevKit

Linux x86_64 with NVIDIA dGPUs

CUDA 12: Maxwell or newer (sm_52 or newer)
CUDA 13: Volta or newer (sm_70 or newer)
tested with Ubuntu 24.04

For previous release notes refer to Previous Releases

Key Highlights

Major Features

Multistream Stereo Sample - High-performance concurrent stream processing
VPI_DEBUG Environment Variable - Runtime debugging without recompilation

Critical Bug Fixes

FAST on Hopper/Blackwell dGPUs - Fixed nondeterministic negative scores
OptFlow Dense (v4.0.1) - Fixed pyramid size rounding error
Sample 19 DCF Tracker (v4.0.3) - Fixed target tracking list management

Performance Improvements

Gaussian Pyramid PVA - Multiple optimizations (unroll, vectorization, agen fixes)
Multistream Stereo - Optimized sync logic for 4ms per frame

Compatibility

API: Fully compatible with VPI 4.0.0
ABI: Maintained across all 4.0.x releases
Platform: All VPI 4.0.x supported platforms
Requirements: BSP 38.2.1-PRC2+, CUDA 13.0

VPI_DEBUG Environment Variable

# Enable exception backtraces
VPI_DEBUG=exception ./your_application
 
# Shows thread names with VPIStream handles
# Backtraces at exception throw points

Known Issues Resolved

Dense Optical Flow: Pyramid levels > 3 is now working.
FAST/ORB algo on Hopper/Blackwell dGPUs works
Sample 19: DCF tracker works for all nvpmodel settings
Fisheye sample work with default opencv version

Known Issues

StereoDisparity: The following block linear formats are not working: VPI_IMAGE_FORMAT_NV12_ER_BL, VPI_IMAGE_FORMAT_NV12_ER_BL16, VPI_IMAGE_FORMAT_NV12_BL, VPI_IMAGE_FORMAT_NV12_BL16. Workaround is to convert those image formats.
Dense Optical Flow: There is no discernible difference in quality from low, medium to high.
Background Subtractor: Initial frames may produce unstable background model.
PyTorch: 16-vpi_pytorch sample fails due to the absence of a compatible PyTorch module for CUDA Toolkit 13.0.
ORB: pva backend does only produce FAST keypoints.
Jetson Thor - VIC, Interpolation Limitation: VPI_INTERP_NEAREST not available.

Notices

Disclaimer

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Trademarks

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VPI - Vision Programming Interface

4.0 Release