Do the API code examples still work from this roboflow blog? Errors from sample code

Community Help
1

I’m trying to use the roboflow API to run inference on my webcam but neither the simple or async versions work for me, I get the error:

cv2.imshow('image', image)
cv2.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@2.715] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (539) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback

My webcam definitely is in port 0 and is working on other python scripts that call cv2.videoCapture(0)

Any ideas whats going on?

2

Hey @Vulcan88

Skimming through, it looks like https://infer.roboflow.com/ should be https://detect.roboflow.com/. I’ll update this now.

3

Ah i see the blog post itself was wrong but the github files did use detect so I guess they were retroactively changed, unfortunately it wasn’t the cause of the problem :smiling_face_with_tear:

From some debugging it seems that on line 54 in infer_simple.py:

image = cv2.imdecode(image, cv2.IMREAD_COLOR)

This is the method at which image is being returned as a NoneType, hmmm…

4

Ok, can you try these things while I try to reproduce this error?

  • check if your webcam works fine with any other library other than OpenCV
  • change VideoCapture(0) => VideoCapture(1)
  • uninstall OpenCV and reinstall it
  • relaunch the code editor or try with a different IDE