Develop Reference

Create a loop to get the image from the camera without breaking(any reason)

I am going to write a code to get the image from the IP camera. Of course, if the connection between the code and the camera is interrupted (for any reason), it will wait to connect again and start imaging again.
as we know
Receiving the image from the camera does not work with the usual loops.
I checked almost all the cases and did not get any results.
Edit my code to get the image:
python 3.6.17
opencv 3.4.2.17
import cv2
#print("Before URL")
cap = cv2.VideoCapture('rtsp://admin:123456#192.168.1.216/H264?ch=1&subtype=0')
#print("After URL")
while True:
#print('About to start the Read command')
ret, frame = cap.read()
#print('About to show frame of Video.')
cv2.imshow("Capturing",frame)
#print('Running..')
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()

OpenCV capture doesn't work gets this problem MFVideoFormat_RGB24(codec not found),how can i solve?

I am making a python app i need openCV library here is my code:
# importing the required modules
import cv2
import numpy as np
# capturing from the first camera attached
cap = cv2.VideoCapture(0)
# will continue to capture until 'q' key is pressed
while True:
ret, frame = cap.read()
cv2.imshow('frame', frame)
# Program will terminate when 'q' key is pressed
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# Releasing all the resources
cap.release()
cv2.destroyAllWindows()
when I run the code I got this error:
[ WARN:0] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-wwma2wne\opencv\modules\videoio\src\cap_msmf.cpp (677) CvCapture_MSMF::initStream Failed to set mediaType (stream 0, (640x480 # 30) MFVideoFormat_RGB24(codec not found)
I think may be it requires a codec driver but i don't know how to fix the error
please help me friends

following code resolved this issue for me: cap = cv2.VideoCapture(0,cv2.CAP_DSHOW)

try
cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)

OpenCV real-time camera image not moving

I'm trying to run the most simple script for viewing the laptop's camera in real time. But unfortunately after starting the window shows, but I get only a single frame displayed that doesn't ever get updated.
import cv2
cap = cv2.VideoCapture(0)
while True:
ret, img = cap.read()
cv2.imshow('test', img)
if cv2.waitKey(-1):
break
cv2.destroyAllWindows()
cap.release()
I was following tutorials for installing this on Windows and installed it on separate environment, using pip and downloaded wheel. The window shows OK, and the image from camera is displayed but static. The program isn't hanged however, because it awaits a key being pressed and closes correctly afterwards.
What can be the cause?

Try using this loop:
while True:
ret, img = cap.read()
cv2.imshow('test', img)
keypressed = cv2.waitKey(30)
if keypressed == ord('q'):
break
The argument of cv2.waitKey(delay) is the delay in millisecond and the returned value is the key pressed:
The function waitKey waits for a key event infinitely (when 𝚍𝚎𝚕𝚊𝚢≤0 ) or for delay milliseconds, when it is positive. [..]
It returns the code of the pressed key or -1 if no key was pressed before the specified time had elapsed.
See: https://docs.opencv.org/4.1.0/d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7

Try this:
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Display the resulting frame
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

I hope this will work it is fast and easy solution.
you can capture image by pressing c and q for quit the window
import cv2
cap = cv2.VideoCapture(0)
count=0
while(True):
ret, frame = cap.read()
cv2.imshow("imshow",frame)
key=cv2.waitKey(30)
if key==ord('q'):
break
if key==ord('c'):
count+=1
cv2.imwrite('/home/user/Desktop/image'+str(count)+'.png', frame)
cap.release()
cv2.destroyAllWindows()

How to access video stream from an ip camera using opencv in python?

Right now I am using a web cam and it works perfectly fine with the code below -:
capture = cv2.VideoCapture(0)
Now instead of web cam, I want to use the ip camera(https://192.168.0.60)
What would be the easiest way to do it with OpenCV(Python)?
I saw a bunch of posts, but couldn't find a straight answer to this.
Can someone help, who already got it running?
Thank you!

Firstly, you must find the exact url for your video stream, and that's best done with a web browser. For example I use IP Webcam app on android (com.pass.webcam) and it's stream will be on:
http://phone-ip-address:port/video
If I visit that url with a web browser, I can see the live stream. Make sure, that what you see is only the video stream, not a html page with the stream. If there is a html page, you can right-click and select Open image in new tab (in Chrome) to get to the stream.
However it looks like OpenCV can only read the video stream if the filename/url has the right suffix. Adding ?type=some.mjpeg worked for me. So the url would be:
http://phone-ip-address:port/video?type=some.mjpeg
Try visiting such an url in the web browser before you go for opencv.

Take a look at this example with python, OpenCV, IPCAM and hikvision
import numpy as np
import cv2
cap = cv2.VideoCapture()
cap.open("rtsp://USER:PASS#IP:PORT/Streaming/Channels/2")
while(True):
# Capture frame-by-frame
ret, frame = cap.read()
# Our operations on the frame come here
#gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# Display the resulting frame
cv2.imshow('Salida',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
Image:
Get video from IPCAM with python and OpenCV

Here you go,
import numpy as np
import cv2
cap = cv2.VideoCapture('rtsp://<username_of_camera>:<password_of_camera#<ip_address_of_camera')
while(True):
ret, frame = cap.read()
cv2.imshow('Stream IP Camera OpenCV',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
For example:
import numpy as np
import cv2
cap = cv2.VideoCapture('rtsp://admin:admin#192.168.0.60')
while(True):
ret, frame = cap.read()
cv2.imshow('Stream IP camera opencv',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
Then save the file as camera.py (.py), go to command prompt or terminal, locate file and type python camera.py or python <file_name>.py enter to run script.
If you want to exit from script windows just press "q" or close cmd.
Hope this helpful.

Here is an example for a Vivotek IP8136W IP Camera. It does not support streaming.
This code continuously grabs still frames, at about 2fps. No observed CPU loading.
import numpy as np
import cv2
# for webcams, request stream only once.
#cap = cv2.VideoCapture(0)
while(True):
# For single image IP cams, request frame every time.
cap = cv2.VideoCapture("http://root:0002A78D65F2#192.168.1.38/cgi-bin/viewer/video.jpg")
ret, frame = cap.read()
# Display the resulting frame
if ret:
cv2.imshow('camera',frame)
else:
print("error getting frame.")
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# Done. release the capture
cap.release()
cv2.destroyAllWindows()

AR Drone 2.0 Streaming

The following code is trying to stream a video from an A.R Drone using python. When I run the code, I receive error error reading video feed. I am using OPENcv 3.3.0. Maybe I am suppose to download something. I am not entirely sure. I am a newbie to this.
import cv2
cam = cv2.VideoCapture('tcp://192.168.1.1:5555')
running = True
while running:
# get current frame of video
running, frame = cam.read()
if running:
cv2.imshow('frame', frame)
if cv2.waitKey(1) & 0xFF == 27:
# escape key pressed
running = False
else:
# error reading frame
print 'error reading video feed'
cam.release()
cv2.destroyAllWindows()