"cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly'" Code Answer's

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cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

By THINK989THINK989 on Jun 19, 2020 
Hello Everyone,

I had run into the same problem a few days back. Here's my perspective on why this error came up and how can it be fixed.

The reason behind the error:-
- ```cv2.imread() or cv2.VideoCapture()``` can't find where the file is and hence gives src.empty() since None is returned instead of image or video
- If you are sure that the path specified is correct, then chances are the file being read is corrupted either completely or in a few bits and pieces.

If you got into this problem when working with an image then here is the fix:-
- Change the image, literally. If you don't want to change it then try ```from PIL import Image and Image.open()``` and see if that works and try to display the image by using matplotlib.
- Changing or reproducing the same image is the best option in my opinion.

If you got into this problem when working with a video then here is the fix:- 
- After using ```cv2.VideoCapture('video path')``` Try something like below example.
```
# suppose this was the source 
cap = cv2.VideoCapture('data/input.mpg')
# Get width and height of the frame of video
width  = cap.get(3) # float width
height = cap.get(4) # float height    
# Make a video writer to see if video being taken as input inflict any changes you make
fourcc = cv2.VideoWriter_fourcc(*"MJPG")
out_video = cv2.VideoWriter('result/output.avi', fourcc, 20.0, (int(width), int(height)), True)
# Then try this
while(cap.isOpened()):
        # Read each frame where ret is a return boollean value(True or False)
        ret, frame = cap.read()
        # if return is true continue because if it isn't then frame is of NoneType in that case you cant work on that frame
        if ret:
            # Any preprocessing you want to make on the frame goes here
            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
            # See if preprocessing is working on the frame it should
            cv2.imshow('frame', gray)
            # finally write your preprocessed frame into your output video
            out_video.write(gray) # write the modifies frame into output video 
            # to forcefully stop the running loop and break out, if it doesnt work use ctlr+c
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
       # break out if frame has return NoneType this means that once script encounters such frame it breaks out 
       # You will get the error otherwise 
        else:
            break
# this will tell you from which frame the video is corrupted and need to be changed 
# this could be due to an empty frame. Empty frame might be a result of mistake made while creating or editing video in tools #like adobe premier pro or other products alike 
# You can check you output video it will contains all frame before the error is encountered
```
I hope this solves your problem and you can better debug your video next time you encounter something similar.

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cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly'

By Innocent IbisInnocent Ibis on May 26, 2021 
new_img = cv2.fillPoly(blank_img,[cnt],color =(255,255,255))

I was facing error in this line.

so The solution is make sure "cnt" must be int not float.

CHANGES:
cnt = np.array([[50,50], [50,150], [150,150], [150,50]],dtype=np.int32)

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0

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cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly' cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly' error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' ERROR Error: ASSERTION ERROR: Stored value should never be NO_CHANGE. Error: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/navigation/history.dart:284:14 _userProvidedRouteName != null is not true detector\nms\src/nms_cuda.cpp(9): error C3861: 'AT_CHECK': identifier not found alpha pose stream_socket_enable_crypto(): ssl operation failed with code 1 Message could not be sent. Mailer Error: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: h8alkc4CZK9H0 Spam Rejected gnutls_handshake() failed: error in the pull function Whoops! Error: DOMException: Failed to execute 'addIceCandidate' on 'RTCPeerConnection': Error processing ICE candidate webpack Error can't resolve ./src stream_socket_enable_crypto(): ssl operation failed with code 1 tempcoderunnerfile.cpp:1:1: error: does not name a type error: *.cpp: Invalid argument error: failed to lookup view "layout" in views directory Failed to open file error: 2 cloud run error: container failed to start. failed to start and then listen on the port defined by the port environment variable. error failed to download metadata for repo 'appstream' ERROR: Failed building wheel for typed-ast error: request failed with status code 400 Failed assertion: 'constraints.hasBoundedWidth': is not true. error launcher chromeheadless failed 2 times (cannot start). giving up (node:621) UnhandledPromiseRejectionWarning: Error: Failed to launch chrome! failed: error during websocket handshake: unexpected response code: 400 carla X Error of failed request: BadDrawable (invalid Pixmap or Window parameter) OpenCV VideoCapture lag why video is not writing opencv
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cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly' error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' difference between hard assertion and soft assertion Error: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/navigation/history.dart:284:14 _userProvidedRouteName != null is not true ERROR Error: ASSERTION ERROR: Stored value should never be NO_CHANGE. Failed assertion: line 1861 pos 16: 'constraints.hasBoundedHeight': is not true. 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