How to put nvbuffer fd into h264 encoder?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hi nvidia:
I get a DMABUF FD from NvBufferTransform, which contain NV12 video data. Then I want to put the FD into h264 encoder ouputplane directly. Can you give me a simple example on how to qBuffer to the encoder outputplane ?

thanks,
Ernan

2 
        struct v4l2_buffer v4l2_buf;
        struct v4l2_plane  planes[MAX_PLANES];
        memset(&v4l2_buf, 0, sizeof(v4l2_buf));
        memset(planes, 0, sizeof(planes));
        v4l2_buf.m.planes = planes;

        if (pctx->index < penc->output_plane.getNumBuffers())
        {
            pnvBuffer = new NvBuffer(V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, V4L2_MEMORY_DMABUF, 3, planefmts, pctx->index);
            v4l2_buf.index = pctx->index;
            pctx->index++;

        
        }
        else
        {
            ret = penc->output_plane.dqBuffer(v4l2_buf, &pnvBuffer, NULL, 10);
            if (ret)
            {
 
                return NULL;
            }
        }

        pnvBuffer->planes[0].fd        = fd_temp;
        pnvBuffer->planes[0].bytesused = 1;

        ret = penc->output_plane.qBuffer(v4l2_buf, pnvBuffer);
        if (0 > ret)
        {

        }

fd_temp is the source FD which contains NV12 video data. My code cause coredump at the first output_plane.qBuffer. Can you give me some advice on how to put the fd_temp into the encoder outputplane as video data input?

4

Hi,
Do you use Jetpack 4 or 5? Please share the release version you re using.

5

My platform is R35.2.1 AGX XAVIER.

6

Hi,
We have deprecated NvBuffer APIs on Jetpack 5, so please use NvBufSurface APIs. For video encoding, please refer to 01_video_enode sample. Or can refer to the 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 latest Jetpack 5 is 5.1.3. Certain issues are fixed in later releases and it would be great if you can upgrade.

8

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