To access a gray frame from YUV420p(progressive)

Accelerated Computing Intelligent Video Analytics DeepStream SDK
#1

Hardware Platform (Jetson / GPU) NX
• DeepStream Version 6.11
• JetPack Version (valid for Jetson only) 5.02
• TensorRT Version 8.4

I am using preprocess plug-in, the source is a 800x512 rtsp h264 stream. For I need a gray frame before to calculate the ROI params,
I insert a piece of codes:
cv::Mat yuv;
yuv.create(height, width, CV_8UC1);
memcpy(yuv.data, surface->surfacelist[frameIndex].mappedAddr.addr[0],heightwidthsizeof(uchar));

is above code correct?
Thanks

#3

Before you dump data from NvBufSurface, you need to check memType, format and layout first. Different memType, format and layout, the dump method is different. DeepStream SDK FAQ - Intelligent Video Analytics / DeepStream SDK - NVIDIA Developer Forums 5

here is a sample: DeepStream SDK FAQ - #18 by bcao

#4

Thanks, I’ll check further.

#5

Do you still need support for this topic? Or should we close it? Thanks.

#6

close ok. Thanks

#7

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