How to use cap of usb camera to write data when deepstream app is running?

[zhang.ga]

In my deepstream app, the usb device is designed to link both camera and led, reads from camera and writes to control led, when detect some object, I need use cap of the device to set data to control led, how can I get the cap of the device to write data when the app is running? I am using python.

Thanks

deepstrem version is 6.1.1

[kayccc]

Your topic was posted in the wrong category. I am moving this to the DeepStream SDK category for visibility.

[yingliu]

Can you describe the details of your “usb device” and the meaning of the “cap of the device”?
Can you get the camera informatin via v4l2ctl command?

[zhang.ga]

v4l2ctl command runs well

[zhang.ga]

Thanks man

[zhang.ga]

hi,

Thanks for your reply.

1 The device is integrated device, integrates a camera and a led panel, camera is responsible for catch picture for analysis, and led panel is to show result.

2 The device connects to Xavier NX, to catch picture just need to add “/dev/video0” to pipeline, link and play, it runs well.

3 To turn on led panel to show something, I use python code as following:
cap = cv2.VideoCapture(“/dev/video0”)
if cap.isOpened():
cap.set(0x0a, 0x11)
when streamapp doesn’t run, it works well too.

4 But, when the deepstream app is running, the cap like above can not be opened, so the led can not be operated, I think it is due to conflict.

5 Now, I want to know if there is a device handle like cap to operate led in deepstream app, thus need not to get another device handle to avoid this confilct.

Any question above the description, I will make clear at first time, any advice, much appreciated. ^_^

[fanzh]

@zhang.ga

the cap like above can not be opened

please check this again, can we get some error information?

@zhang.ga

I want to know if there is a device handle like cap to operate led in deepstream app

currently, deepstream only get pictures from device.

[zhang.ga]

Hi，

No error information, just cap.isOpened() is False, and led control doesn’t work.

Anyway, thanks

[fanzh]

deepstream uses gstreamer plugin v4l2src to get pictures from camera, you can use v4l2src to send message to camera, please refer to v4l2src

[zhang.ga]

OK，I will try, Thanks

[fanzh]

Is this still an issue to support? Thanks

[zhang.ga]

Yes, do you know the possible python API for this?

[fanzh]

you can call set_property to set v4l2src’s extra-controls property. like this:
pgie.set_property(‘config-file-path’, “dstest1_pgie_config.txt”)

[zhang.ga]

hi, the issue is fixed, like you said, using “set_property”, thank you very much ^_^