I am trying to record videos from 2 cameras at 30 fps and resolution of 640x480, but i am unable to get 30fps. I am using gstreamer and opencv like, v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=BGR ! queue ! appsink v4l2src devic…

Hey Dane, found the problem in my application it was due to high file io, i have solved the issue now and it does seem that even cv2 is also adding to the cpu usage but that under my threshold.

Suppose the memory copy hurt the performance. Try the nvv4l2camerasrc instead of v4l2src to verify it.

hey shane will try it out and let you know. thanks

hey shane, by changing to nvv4l2camerasrc there is no improvement still the same.

Is it USB camera? USB2.0 or USB3.0? Please verify by v4l2-ctl to launch two camera. v4l2-ctl --set-fmt-video=width=640,height=480 --stream-mmap -d /dev/video0 & v4l2-ctl --set-fmt-video=width=640,height=480 --stream-mmap -d /dev/video1 &

It is a USB camera on a USB 2.0 port. I have ran the 2 commands and it runs at 29.75 FPS on an average.

Hi, You can run this and check if it achieves 30 fps for both cameras: gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=BGR ! queue ! fpsdisplaysink text-overlay=0 video-sink=fakesink sync=0 v4l2src device=/dev/vide…

/GstPipeline:pipeline0/GstFPSDisplaySink:fpsdisplaysink0: last-message = rendered: 1099, dropped: 0, current: 29.72, average: 29.80 /GstPipeline:pipeline0/GstFPSDisplaySink:fpsdisplaysink1: last-message = rendered: 1126, dropped: 0, current: 29.98, average: 29.21

hey Dane, i am already using a separate thread just to read frames in which i am reading both the cameras. Although now i have made 2 separate threads now each for a camera and the resultant fps has not improved its still at 25fps.

Cannot record 2 camera at 30fps jetson nano

Robotics & Edge Computing Jetson Systems Jetson Nano

DaneLLL May 3, 2022, 9:17am 11

Hi,
It looks like both sources can achieve 30fps from the prints. And we would suggest try to create individual thread for each camera. A user has shared a sample and please take a look:
Nvidia-desktop kernel: [407343.357549] (NULL device *): nvhost_channelctl: invalid cmd 0x80685600 - #18 by DawnMaples

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Cannot record 2 camera at 30fps jetson nano

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