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dusty-nv / jetson-utils

C++/CUDA/Python multimedia utilities for NVIDIA Jetson
MIT License
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Question about NVVM memory copy in gstEncoder #181

Closed SeeRich closed 12 months ago

SeeRich commented 1 year ago

Hey! Im working with a Jetson Nano 4GB and trying to squeeze out as much performance as possible. I’m trying to understand the memcpy from CUDA YUV to gstbuffer in the encodeYUV function. Why is this memcpy necessary? It seems to be followed by nvvidconv name=vidconv ! video/x-raw(memory:NVMM) element? Could we use nvbuf_utils to allocate the memory for the last cuda output from RGB to YUV then something like gst_buffer_append_memory to avoid the memcpy? I feel like I may be completely missing something though.

dusty-nv commented 12 months ago

@SeeRich IIRC it was because I only supported getting data from incoming NVMM gstreamer buffers (for gstCamera/gstDecoder), but not allocating my own outgoing NVMM buffers (for gstEncoder). Anyways, that API changed and was removed from future versions of JetPack, and on those I just disable it all together (for multi-stream applications where it could have an appreciable impact, I'd recommend using DeepStream anyways as jetson-utils is primarily to be easy and 'fast enough')

SeeRich commented 12 months ago

@dusty-nv, thanks, I will take a look at deepstream.