My system: Jetson Xavier NX Jetson Linux 35.2.1 For my application I have some frames on cuda memory which I want to encode them. Using the MMAPI video encoding sample I could encode my video correctly. However according to the sample, before enqueuing the frames using v4l2_buf, I have to transf…

Hi, Yo may refer to the sample: /usr/src/jetson_multimedia_api/samples/03_video_cuda_enc NvBufSurface can be mapped to GPU and you can GPU-to-GPU memory copy to have frame data in NvBufSurface. And we have later Jetpack release. Would suggest upgrade to latest 5.1.3(r35.5.0)

Thank you I am checking that sample as well. In that one also the initial data is grasped by CPU and then mapped to GPU. I am wondering how can I load the NvBuffer on GPU even before mapping by NvBufSurface? Can I map NvBufSurface to GPU in advanced, and then copy my GPU data to NvBufSurfaceMapped…

Hi, The 03 sample demonstrates how to access NvBufSurface through GPU and CPU. You may ignore the CPU part and focus on GPU part.

Thank you, I am trying to get the key point here. This is the main part of the 03 sample that I am looking at: struct v4l2_buffer v4l2_buf; struct v4l2_plane planes[MAX_PLANES]; NvBuffer *buffer = ctx.enc->output_plane.getNthBuffer(i); memset(&v4l2_buf, 0, sizeof(v4l2_buf)); memset(planes, 0, MAX_…

Hi, Please check HandleEGLImage() in /usr/src/jetson_multimedia_api/samples/common/algorithm/cuda/NvCudaProc.cpp Would need to call the CUDA functions to get the pointer and then can copy data to the NvBufSurface.

Hi, Now I am getting some ideas. It seems using the below code, I can transfer my data to the NvBufSurface eglImage: for (uint32_t j = 0 ; j < buffer->n_planes; j++) { NvBufSurface *nvbuf_surf = 0; NvBufSurfaceFromFd(buffer->planes[j].fd, (void**)(&nvbuf_surf)); NvBufSurfaceMapEglI…

Encode frames using v4l2 and NvBufSurface

Robotics & Edge Computing Jetson Systems Jetson Xavier NX

DaneLLL June 12, 2024, 8:03am 9

Hi,
For feeding NvBufsurface in output plane, you don’t need to fill in NvBuffer. Please also refer to this patch:
How to use v4l2 to capture videos in Jetson Orin r35 Jetpack 5.0 and encode them using a hardware encoding chip - #8 by DaneLLL

And please check write_video_frame() for getting encoded stream in capture plane.

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Encode frames using v4l2 and NvBufSurface

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