Python opencv cv2.VideoCapture freeze-CodePudding

My code always freezes on me. I'm testing it on this code.

import cv2

cap = cv2.VideoCapture('/dev/video0') # frozen
ret, frame = cap.read()
print(ret, frame)

My configuration is

raspberry pi
Python 3.9.2
Canon 600D

this command works normally

gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0

There may be a bug in the Cannon 600D.

CodePudding user response：

you should add loop for your code. If u dont do this u always get only 1 frame from camera. Example:

    import cv2
    
    cap = cv2.VideoCapture('/dev/video0') # frozen
    while true:
        ret, frame = cap.read()
        if not ret:
            continue
        print(ret, frame)

CodePudding user response：

it needed to run

sudo modprobe v4l2loopback

and

gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0

and gphoto2 run