Hi All, I am new to encoding in general, but I am trying to take some manually generated OpenCV cv::cuda::GpuMat NV12M frames, encode them to H265 format, and then write out as a video file. I have been using the jetson_multimedia_api samples as reference, but they all seem to use file input/outpu…

Hi, Please execute sudo tegrastats to check if GPU is at full loading. If it is at full loading, the GPU engine shall offer optimal throughput in the use-case. For capability of hardware encoder, please check https://developer.nvidia.com/jetson-xavier-nx-data-sheet

Hi, If your source data is in cv::cuda::GpuMat, you would need to copy the data from GpuMat to NvBufSurface and then send to encoder. This is done through GPU so it should not have much overhead.

Thank you for the quick reply. If it is that simple, then it would certainly be helpful. However, I still do not understand how to use it in conjunction with NvBuffers like how the jetson_multimedia_api samples function. I found this thread previously which seems to be doing something similar. A…

Hi, On Jetpack 4.6.1, please use NvBuffer APIs. And this method should work: Copy OpenCV GpuMat data to an NvBuffer - #9 by sanatmharolkar NvBuffer in NV12 has two planes. One is Y plane and the other is UV-interleaved plane. You would need to copy data to the two planes individually. Here is a …

Thank you for quick reply again. I hadn’t realized that about the planes, but that is true and seems simple enough to split with opencv. I will try with an implementation similar to 01_video_encode and see how it goes. Thank you for the instructions.

On Jetpack 4.6.1, please use NvBuffer APIs. And this method should work: Copy OpenCV GpuMat data to an NvBuffer - #9 by sanatmharolkar This was helpful with getting the code to work for CPU encoding, thank you. You may see: OpenCV CUDA processing from gstreamer pipeline [JP4, JP5] This was…

Unless my math is incorrect, it does seem to be the case that we are reaching the maximum throughput for HEVC encoding. For 4504x4504 images that we use, 40 frames done in about 1.2s seems to have a throughput of 676 MP/s which is close to the maximum listed. It seems the switch to using GPU encod…

I’ve actually run into another issue in trying to get this to work with standard uchar pointers instead of GpuMats. I had assumed setting eglFrame.frame.pPitch[0] and [1] to the Y and UV planes respectively would work, but the buffer ends up not copying anything. Is this format/order of function c…

I do not know if this is even your case but I once created uchar4* pointer from gpumat (which came from egl) and then I used cuda programming to do some processing on my image.

That is what I was doing to copy the data into the buffer, but I wanted to avoid having to use OpenCV if I could. In writing this, I realized my issue and have fixed it. It was actually just a simple mistake involving pointer usage that I overlooked. uchar* d_frame_y_uchar; uchar2* d_frame_uv_uch…

Encoding from OpenCV GpuMat and Writing Output to File

Robotics & Edge Computing Jetson Systems Jetson Xavier NX

Honey_Patouceul November 22, 2023, 9:12pm 8

You may see: OpenCV CUDA processing from gstreamer pipeline [JP4, JP5]

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Encoding from OpenCV GpuMat and Writing Output to File

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