I’m trying to pass the output of NvBufferTransform to /dev/nvhost-msenc via libv4l2. I am using cgo but the general flow is I create an NvBuffer to output to: frame:= &NvBuffer{} if ret := C.NvBufferCreateEx(&frame.fd, &params); ret != 0 { return nil, errors.New("error creating render buffer")…

I figured out what was wrong. In my buffer preparation, I didn’t export all the buffers because I forgot to set index on v4l2_exportbuffer. Thanks @DaneLLL for the pointer to the updated sample, it eventually led me to discover what was different.

Extracting DMA buffer information from NvBuffer

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano

DaneLLL November 2, 2022, 3:01am 3

Hi,
Please dump w.dmaBufs[buf.index].fd and check if the frame data is correct. And you can refer to this patch fo12_camera_v4l2_cuda + NvVideoEncoder:
TX2 Camera convert/encode using Multimedia API issue - #17 by DaneLLL

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Extracting DMA buffer information from NvBuffer

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