• Hardware Platform (Jetson / GPU) : Jetson • DeepStream Version : DS6.2 • JetPack Version (valid for Jetson only) : JP5.1.2 • Issue Type( questions, new requirements, bugs) : Question Hi, I want to apply some cuda kenel based image processing that is transforming the input buffer and pushing t…

please refer to this sample for how to access nv12 by opencv.

Hi, It seems a bit weird so I explained it as below. 1. Cpu sync and then mapping to cv::Mat is doen without memory error, however it seems it is different format, not NV12 input frame (W x H) [output_frame] expected NV12 (raw dump, W x H+H/2) this is converted from RGBA → NV12 conversion […

can you use the the sample in my first comment to reproduce this issue? In that sample, it did nv12 → rgba → rgba-> nv12 conversion. you can use opencv to dump software buffer to check or this method to dump hardware buffer to check.

[image] fanzh: sample Hi yes, for example using /opt/nvidia/deepstream/deepstream/sources/apps/sample_apps/deepstream-test1 isn’t it also corrupting uv when you see the result below? ... //Create Mat from NvMM memory, refer opencv API for how to create a Mat Mat nv12_mat = Mat(height…

Thanks for the sharing! I will check.

from “nv12 raw dump” you shared, the uv part is empty. Here is the test output on DGPU 1.zip (406.2 KB). so there are some issues when using opencv cv:Mat mapping for nv12 nvbufsurface on Jetson. Here is a workaround. use method on Jun 12 to dump the nv12 nvbufsurface to software memory. the s…

Hi, Sorry but could you elaborate more? Maybe you mean I need to do something in the comment region below, but I don’t understand well. Kind Regards, ... NvBufSurface *surface = (NvBufSurface *)in_map_info.data; for (l_frame = batch_meta->frame_meta_list; l_frame != NULL; l_frame = l_frame…

you can dump nv12 hardware buffer to software buffer nv12_data first. please refer to the following code: char* nv12_data = NULL; ...... guint width = surface->surfaceList[frame_meta->batch_id].width; if(nv12_data == NULL){ nv12_data = (char*) malloc(width * height * 3/2); …

Hi, now understand that it’s in multiple planes. alternatively I could do this. Mat nv12_mat_y = Mat(height, width, CV_8UC1, (char *)surface->surfaceList[0].mappedAddr.addr[0], surface->surfaceList[frame_meta->batch_id].pitch); Mat nv12_mat_uv = Mat(height/2, width, CV_8UC1, (char *)s…

Thanks for the sharing! On Jetson, Y and UV of nv12 are not consecutive. it seems opencv can’t cover this case directly.

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fanzh June 15, 2024, 3:37am 14

after cudaMemcpy2D, you can dump hardware buffer to check if the data is valid.
please refer to this topic for NV12 format to GpuMat. please refer to this topic.

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