Ok, so I have two cameras connected to my Jetson Nano 2GB board : Camera 0 : VIDIOC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: 'MJPG' (compressed) Name : Motion-JPEG Size: Discrete 1920x1080 Interval: Discrete 0.017s (60.000 fps) Interval: Discrete 0.033s (30.00…

You may explain how you’re seeing this lag from second camera. Is it using cv::imshow ? Or else ? Also, please confirm that the following commands don’t show any errors nor lag: gst-launch-1.0 v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=60/1 ! jpegparse ! jpegdec ! xvi…

Yeah I’m showing frames by while(true) { cv::Mat frame; cap >> frame; cv::imshow("test", frame); cv::waitKey(1); } When I run this command: gst-launch-1.0 v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=60/1 ! jpegparse ! jpegdec ! xvimagesink v4l2sr…

I realize now that in RAW mode, your first camera cannot achieve 60 fps but only 10. So let’s keep with MJPG for now and use 30 fps for both cameras. Does this work ? gst-launch-1.0 v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=30/1 ! jpegparse ! jpegdec ! xvimagesink …

Ok, the first command crashed my Jetson and the second command opened cameras like this: [Screenshot from 2020-12-14 15-50-29] Camera1 opened correctly with no lag, but camera0 has some weird green line, more than half of it’s gray and it’s lagging greatly. legion@legion-desktop:~$ gst-launch-1.…

I think swap memory is not really used that much to pose a problem… For gst-launch-1.0 v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=30/1 ! jpegparse ! nvv4l2decoder mjpeg=1 ! nvvidconv ! xvimagesink v4l2src device=/dev/video1 ! xvimagesink [Screenshot from 2020-…

I would advise not wasting time with opencv using gstreamer pipeline as long as you are not able to get something working from gst-launch. Main question would be: do both pipelines only work with separate gst clocks in different processes, or just need sync=false for 1st camera. What gives: Same…

Sorry for late reply, gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=30/1 ! jpegparse ! jpegdec ! xvimagesink sync=false v4l2src device=/dev/video1! video/x-raw, format=YUY2, width=1920, height=1080, framerate=30/1 ! xvimagesink Gives me an error : (…

I have to apologize I have made again typos… Edited my last post and added a missing space bteween /dev/video1 and ‘!’ that would make gstreamer unable to run the pipeline. [image] Legion: I started working with OpenCV because this gst-launch-1.0 tee name=stream v4l2src device=/dev/video0 ! im…

gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg,width=1280,height=720,framerate=30/1 ! jpegparse ! jpegdec ! xvimagesink sync=false v4l2src device=/dev/video1 ! xvimagesink That’s working fine :) So I tried your code… if I open cam0 like that it’s really laggy but if I use CAP_V4L i…

OpenCV camera lag

Robotics & Edge Computing Jetson Systems Jetson Nano

JerryChang December 15, 2020, 6:07am 6

hello Legion,

please have a try to configure memory swap, you may check Topic 158686 for reference,
thanks

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OpenCV camera lag

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