Open Webcam through OpenCV - Python

Python
,
1

I a using following code to activate camera, however i am getting following massage.
Please guide me.


import cv2

**CODE**
cap = cv2.VideoCapture(0)

# Check if the webcam is opened correctly
if not cap.isOpened():
    raise IOError("Cannot open webcam")

while True:
    ret, frame = cap.read()
    cv2.imshow('input', frame)

    c = cv2.waitKey(1)
    if c == 27:
        break

cap.release()
cv2.destroyAllWindows()


**ERROR**
runfile('C:/Users/ABVRC/.spyder-py3/Camera Activate.py', wdir='C:/Users/ABVRC/.spyder-py3')
Traceback (most recent call last):

  File "C:\Users\ABVRC\.spyder-py3\Camera Activate.py", line 11, in <module>
    cv2.imshow('input', frame)


error: OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'



[ WARN:0@1.190] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (464) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): OnReadSample() is called with error status: -2147024809
[ WARN:0@1.190] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (476) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): async ReadSample() call is failed with error status: -2147024809
[ WARN:1@1.190] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (1752) CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147024809
[ WARN:2@66.668] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (464) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): OnReadSample() is called with error status: -2147024809
[ WARN:2@66.668] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (476) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): async ReadSample() call is failed with error status: -2147024809
[ WARN:1@66.668] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (1752) CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147024809
[ WARN:1@66.673] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (539) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
[ WARN:3@170.954] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (464) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): OnReadSample() is called with error status: -2147024809
[ WARN:3@170.954] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (476) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): async ReadSample() call is failed with error status: -2147024809
[ WARN:1@170.954] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (1752) CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147024809
[ WARN:1@170.958] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (539) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
[ WARN:4@797.984] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (464) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): OnReadSample() is called with error status: -2147024809
[ WARN:4@797.984] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (476) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): async ReadSample() call is failed with error status: -2147024809
[ WARN:1@797.984] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (1752) CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147024809
[ WARN:1@797.988] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (539) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
[ WARN:5@852.142] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (464) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): OnReadSample() is called with error status: -2147024809
[ WARN:5@852.142] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (476) `anonymous-namespace'::SourceReaderCB::OnReadSample videoio(MSMF): async ReadSample() call is failed with error status: -2147024809
[ WARN:1@852.142] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (1752) CvCapture_MSMF::grabFrame videoio(MSMF): can't grab frame. Error: -2147024809
[ WARN:1@852.159] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (539) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
2

can you try, if the directshow backend works for you ?

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

also, what kind of webcam are you using ?
any chance, you can update drivers ?