Usage of NvBufSurfTransformCompositeBlend for Orin Nano

Issue Overview

Users are experiencing difficulties when attempting to use the NvBufSurfTransformCompositeBlend API on the Nvidia Jetson Orin Nano. The primary symptom reported is the error message “VIC operation is not supported,” indicating potential compatibility issues with the API or incorrect usage. This problem arises during attempts to alpha-blend two images into a destination buffer, specifically when using various image formats and configurations.

Key details include:

• Context: The issue occurs during the implementation of image blending, particularly when trying to blend a PNG image onto a camera stream.
• Hardware/Software Specifications: Users are working with the Orin Nano and utilizing JetPack 5.x. Specific formats mentioned include ARGB for source buffers and GRAY8 for alpha channels.
• Frequency: The issue appears to be consistent among users attempting similar tasks.
• Impact: The inability to utilize this API affects the functionality of applications requiring image blending, leading to frustration and potential limitations in project capabilities.

Possible Causes

Several potential causes for the observed issue have been identified:

• Hardware Incompatibilities or Defects: The NvBufSurfTransformCompositeBlend API may not be supported on the Orin Nano, leading to operation failures.

• Software Bugs or Conflicts: Known issues with JetPack versions could prevent proper functioning of the API, as indicated by user replies discussing upcoming fixes in JetPack 5.1.2.

• Configuration Errors: Incorrect buffer dimensions or formats may lead to compatibility issues. For instance, while users ensured that width and height matched, it remains unclear if depth consistency is required.

• Driver Issues: Outdated or incompatible drivers may hinder the performance of hardware-accelerated APIs.

• User Errors or Misconfigurations: Misunderstanding of API requirements or incorrect setup in GStreamer pipelines could lead to failures in achieving desired results.

Troubleshooting Steps, Solutions & Fixes

To address the issues with NvBufSurfTransformCompositeBlend, users can follow these troubleshooting steps and potential solutions:

1. Verify Buffer Configurations:

   • Ensure that all buffers (src0, src1, alpha, and destination) have matching width and height.
   • Experiment with different formats for all buffers (e.g., use ARGB for all).

2. Use Alternative APIs:

   • If NvBufSurfTransformCompositeBlend is unsupported, consider using NvBufSurfTransformMultiInputBufCompositeBlend() as suggested by users. This alternative may provide similar functionality.
   • Reference sample code available in /usr/src/jetson_multimedia_api/samples/13_argus_multi_camera/.

3. Test GStreamer Pipeline:

   • Review and modify your GStreamer pipeline to ensure correct handling of alpha channels. For example:

     gst-launch-1.0 nvcompositor \
          name=comp sink_0::xpos=0 sink_0::ypos=0 sink_0::width=1920 \
          sink_0::height=1080 sink_1::width=1920 sink_1::height=1080 ! \
          'video/x-raw(memory:NVMM)' ! queue ! nv3dsink \
          nvarguscamerasrc sensor-id=0 ! \
          'video/x-raw(memory:NVMM),width=1920,height=1080,format=NV12,framerate=60/1' \
          ! comp.sink_0 \
          filesrc location='overlay.png' ! pngdec ! imagefreeze ! nvvidconv ! comp.sink_1 -e
     

   • Ensure that the PNG file has an alpha channel recognized by nvcompositor.

4. Check for Known Issues:

   • Keep updated on known issues related to JetPack versions; specifically, check for fixes in JetPack 5.1.2 regarding composite operations.

5. Update Drivers and Firmware:

   • Ensure that all drivers and firmware are up-to-date to avoid compatibility problems.

6. Consult Documentation:

   • Refer to Nvidia’s official documentation for any updates or specific configuration guidelines related to the APIs being used.

7. Best Practices for Future Use:

   • Always verify compatibility of APIs with specific hardware before implementation.
   • Maintain updated software environments to reduce conflicts.
   • Engage with community forums for shared experiences and solutions.

By following these steps, users can systematically diagnose and potentially resolve issues related to image blending on the Nvidia Jetson Orin Nano. Further investigation may be required if problems persist despite these troubleshooting efforts.