opencv Video capture via Open cv + Gstreamer wirh CSI camera no response.

[ManyanJin10 0]

Hi I've just start Tinker 2S (Debian ver) user.

It's very cool small computer and enjoy to connect camera.

I'm using MIPI cam(IMX219) . GStreamer pipeline command line is no problem showing video.

But try to integrate python code, no response from camera. 

I want to ask you guys how should I do.

below is test python code.

 

Quote

import cv2
#import time
#import tkinter as tk
#from PIL import Image, ImageTk

src = "gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! videoconvert ! autovideosink"
#,cv2.CAP_GSTREAMER appsink drop=true sync=false
cap=cv2.VideoCapture(src, cv2.CAP_GSTREAMER)
#time.sleep(3)
    
while cap.isOpened():
    ret, frame_read = cap.read()
    cv2.imshow('Read',frame_read)
    cv2.waitKey(30)
cap.release()

python 3.7.3

Opencv version =opencv-python 4.6.0.66

numpy 1.21.6

pip 22.1.2

 

Edited June 22, 2022 by ManyanJin10
module version added

[tooz 47]

hello @ManyanJin10, 

which debian os are you using? if you're using one of the official releases from tinker-board.asus.com

may i know the version? thank you.

[ManyanJin10 0]

Hello @tooz,

I downloaded TinkerOS image, Tinker Board 2 Debian 10 V2.0.4 from tinker-board.asus.com .

If execute pipeline "gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! videoconvert ! autovideosink"

in the termial, capture process is no problem.

 

.

 

[tooz 47]

hello @ManyanJin10, 

you can try to modify this line to:

 src = "gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! videoconvert ! appsink"

 

[ManyanJin10 0]

Good morning! Tooz.

I changed parameter according to your advice, but no response from command line of python

"python xxx(above code).py"

To confirm video capture process is started or not, I inserted "cap.isOpened "status.

As a result of check, cap.isOpened is failed. video stream doesn't overlay via gstreamer and show in the Opencv.

 

 

 

 

[ManyanJin10 0]

Hi tooz.

 

Regarding this issue, I resolved myself with your advice.

I found my Opencv set GStreamer "No".

That's why I uninstalled opencv and build source after working well.

 

Thank you for your supporting!

[tooz 47]

hello @ManyanJin10, 

that's great to know, thanks for the update.