I am trying to access Nvbuffer memory and convert it to opencv mat. I am able to do the conversion but in the process of doing show the image is getting converted into a grey scale one with messed up dimensions. But if I do a ofstream file write with m_JpegEncoder I am getting proper image with rig…

Hi, We don’t observe the issue by applying following patch to 13_multi_camera: diff --git a/multimedia_api/ll_samples/samples/13_multi_camera/main.cpp b/multimedia_api/ll_samples/samples/13_multi_camera/main.cpp index 49a9ab8..0613f0b 100644 --- a/multimedia_api/ll_samples/samples/13_multi_camera/…

Thank you for your reply. I followed the patch and the following is working properly. void *pdata = NULL; NvBufferParams params; NvBufferGetParams(m_dmabufs[0], &params); NvBufferMemMap(m_dmabufs[0], 0, NvBufferMem_Read, &pdata); NvBufferMemSyncForCp…

Hi, Please call dump_dmabuf() to dump m_compositedFrame and check if the RGBA data is correct.

yes, I double checked and it did write to file with all proper channels. Also g_renderer->render(m_compositedFrame); works correctly. I am constructing composite dma buffer buy using NvBufferComposite(m_dmabufs, m_compositedFrame, &m_compositeParam);

NVBuffer (FD) to opencv Mat

Robotics & Edge Computing Jetson Systems Jetson TX2

DaneLLL October 14, 2019, 9:09am 2

Hi,
Please refer to the patch.
Should be valid if you call createNvBuffer(NvBufferColorFormat_ABGR32) in the code.

NV Multimedia API with OpenCV

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NVBuffer (FD) to opencv Mat

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