Attempting to stream camera video and encode with nvjpeg, but lib mismatch? (C++)

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hi,

I am taking the source from GitHub - JetsonHacksNano/CSI-Camera: Simple example of using a CSI-Camera (like the Raspberry Pi Version 2 camera) with the NVIDIA Jetson Developer Kit and changing “videoconvert” to “nvjpegenc”. I can compiling successfully with this command:

g++ simple_camera.cpp -o simple_camera `pkg-config --cflags --libs opencv`

However, I get this result:

JPEG parameter struct mismatch: library thinks size is 584, caller expects 728

I found this thread: https://devtalk.nvidia.com/default/topic/1057461/jetson-nano/jetson-nano-gstreamer-opencv-using-nvjpegenc-to-encode-frames-from-opencv-as-appsrc/post/5362215/#5362215

which leads me to believe I am not linking against the nvjpeg lib, but I am unsure how to do that. I’ve tried the following with no luck:

g++ simple_camera.cpp -o simple_camera `pkg-config --cflags --libs opencv` -L/usr/src/nvidia/tegra_multimedia_api/include/libjpeg-8b -lnvjpeg

The result for the above command is:

/user/bin/ld: cannot find -lnvjpeg

Any ideas?

2

The path for link looks wrong. Try instead

-L/usr/lib/aarch64-linux-gnu/tegra
3

Thanks! That gets rid of any of the linking problem, but I am still getting the JPEG parameter struct mismatch error.

this is my build command:

g++ simple_camera.cpp -o simple_camera `pkg-config --cflags --libs opencv` -L/usr/lib/aarch64-linux-gnu/tegra -lnvjpeg

and this is the result:

Using pipeline:
	nvarguscamerasrc ! video/x-raw(memory:NVMM), width=(int)3264, height=(int)2464, framerate=(fraction)12/1, format=(string)NV12 ! nvvidconv ! video/x-raw, width=(int)3264, height=(int)2464 ! nvjpegenc ! appsink
JPEG parameter struct mismatch: library thinks size is 584, caller expects 728
4

Hi,
For running with OpenCV, we suggest use jpegenc instead of nvjpegenc. OpenCV links to libjpeg.so in many places and it is difficult to replace it with libnvjpeg.so.

5

Ah, that make sense. How difficult are we talking? We are looking at the nvjpegenc due to performance reasons

6

Hi,
We are not not sure about the effort. Have not seen users successfully done this and shared the result( also possible some users have done it but do not share ).

7

please add this include directory

-I/usr/src/nvidia/tegra_multimedia_api/include/libjpeg-8b

example gcc -o jpeg_enc jpeg_enc.c -I/usr/src/nvidia/tegra_multimedia_api/include/libjpeg-8b -L/usr/lib/aarch64-linux-gnu/tegra -lnvjpeg -w -Wall

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