Opencv video feed stops on the first frame

Question

I'm trying to get a video feed through camera of my android phone using IP webcam and opencv.I'm using python 3.5(anaconda distribution) with opencv 3.1.0 Here is the code:

import cv2
import numpy as np

cap = cv2.VideoCapture(0)
cap.open('http://192.168.1.4:8080/video')
while True:
    ret, frame = cap.read()
    cv2.imshow('RGB output', frame)
    if cv2.waitKey(0):
        break
cap.release()
cv2.destroyAllWindows()

Problem is that when I run the script, I can only see the first frame rather than the constant video feed. I've searched alot but couldn't find a solution. Help!

problem: if you press any key you will break. but since you have waitKey (0) you'll have to press a key. So change to sth. like if waitkey (0) == 'q' to only stop when q is pressed or change to if waitKey(10) to not wait for a keypress but stream continuously and only cancel on keyPress — Micka, Jan 08 '16 at 18:02
What a silly mistake by me! It now works flawlessly, Thanks! — Amol Borkar, Jan 09 '16 at 01:54

score 0 · Answer 1 · edited Aug 23 '19 at 06:25

0

import cv2
import numpy as np

cap = cv2.VideoCapture(0)
cap.open('http://192.168.1.4:8080/video')

while True:
    ret, frame = cap.read()
    cv2.imshow('RGB output', frame)
    key = cv2.waitKey(1):
    if key == ('c'):
            break

cap.release()
cv2.destroyAllWindows()

Try the above code it will be just fine..

edited Aug 23 '19 at 06:25

barbsan

3,418
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answered Aug 23 '19 at 05:59

Sekhar Jyoti Deka

1
1

Welcome to SO. Please add some context to this answer and fix the formatting. – Paul Dawson Aug 23 '19 at 06:04
Yes but it is helpful to state the general principle, waitKey(0) as in the OP code is an infinite wait or wait unitl a key is pressed. – Roger Levy Mar 26 '20 at 16:05

score 0 · Answer 2 · answered Dec 11 '21 at 23:37

cap=cv2.VideoCapture(0)
while True:
    success,frame=cap.read()  
    if(success):
        gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
        cv2.imshow("Image",gray)
    
    
    if cv2.waitKey(1) & 0xFF==ord('z'):
        break
        
        
        
cap.release()        
cv2.destroyAllWindows()

cv2.waitKey(0) is the reason you have to set it to 1 if you want to close The Window from the existing button leave your code as it is but without 0 to give time to CPU to process since it Video.

Notice, You have to add & 0xFF To Avoid other problems occurring if your NumLock is activated.

More Here What's 0xFF for in cv2.waitKey(1)?

This Code Above is the Best Practice

Opencv video feed stops on the first frame

2 Answers2