I'm using playingvideofromfile line for line, but using the full path of the file.
still get the following error: OpenCV(3.4.1) C:\bld\opencv_1520732670222\work\opencv-3.4.1\modules\imgproc\src\color.cpp:11147: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor
but @MarcinRosol said that source code is https://docs.opencv.org/3.0-beta/doc/... (Play video from file ) and it is checked in this source code. @MarcinRosol did you copy exactly source code?
cap = cv2.VideoCapture('vtest.avi')
while(cap.isOpened()):
ret, frame = cap.read()
if ret==False:
print ('cannot read frame')
break
gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
This worked. Thanks! Just trying to figure out why now.
Asked: 2018-05-11 13:09:13 -0600
Seen: 1,671 times
Last updated: May 11 '18
can you replace capr.read() with
Same error, it keeps pointing to gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
add print (frame.shape) after cap.read()
python users NEVER do checks, like `
cap.isOpened()orret==Truewhen playing a video file , the last frame will return False there.
this worked adding these conditions. I guess the program didn't know what to do when the video finished.
the program is dumb.
the programmer did not know, what to do ;)