Using an USB camera

[jjferreira]

Hi there how can make this code run using a usb camera, instead of the camera suggested in your article.

[tomasz-lewicki]

Hi @jjferreira !

1. You're probably better off using CSI camera. Using a USB camera will need more CPU to copy data & decode the video stream from USB.
2. If you still want to use a USB camera here's how you'd do it:

Substitute this line from

cap = cv2.VideoCapture(gst_string, cv2.CAP_GSTREAMER)

to

cap = cv2.VideoCapture('/dev/video3')

This assumes that your USB camera is on /dev/video3. If you don't know which device node the USB cam is associated with, do dmesg -w and observe the output while plugging the USB camera.

Hope this helps!

[jjferreira]

Hi @tomek-l , thank you for this response, but I'm a bit confused. This file u asked me to make a change its on a different project and repository. I downloaded the ai-thermometer repository and the changes are on the jetson-cameras repository, do you mind clarifying.

Thank you

[tomasz-lewicki]

Hi there!

Solution:

In order to clone everything, including submodules do:

git clone --recursive https://github.com/tomek-l/ai-thermometer

Explanation:

When you see something like this:

It means the author is using git submodules. This is basically a git repository containing another git repository inside of it.

I also updated instructions to include --recursive flag.

[jjferreira]

Hi @tomek-l thank you for your explanation. It runs but not as expected see picture attached.

[tomasz-lewicki]

Hi @jjferreira ,

What webcam are you using?
Did you have any success so far in getting the image in other applications?

[jjferreira]

Hello @tomek-l, I tried my intel realsense d435i, and a standard logitech Usb camera. Same behaviour. But if i run a simple python script i can see both cameras working as expected. Tks

…

On Fri, 14 May 2021 at 08:46, Tomasz Lewicki ***@***.***> wrote: Hi @jjferreira <https://github.com/jjferreira> , What webcam are you using? Did you have any success so far in getting the image in other applications? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#35 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABY2X4JYDQ4XDPI2ZWDB7ODTNTIORANCNFSM44FT625A> .

[jjferreira]

The issued I was having was to do with the lens of the thermal became loose.