OpenCV - extract 1st frame out of a video file

[kerzol81]

Hi All,

I'm trying to extract the first frame of a sample video file with OpenCV however it doesnt work:

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import cv2   f = cv2.VideoCapture('1.mkv')   rval, frame = f.read() cv2.imwrite('first_frame.jpg', frame) f.release()

Could you help me out, what do I do wrong, the jpeg file is empty after running the code

Thanks

Zoli

[Daredevil]

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import cv2 import numpy as np vidcap = cv2.VideoCapture('http://Desktop/SampleVideo_1280x720_1mb.mp4') success,image = vidcap.read() count = 0 while success:   cv2.imwrite("frame%d.jpg" % count, image)     # save frame as JPEG file        success,image = vidcap.read()   print('Read a new frame: ', success)   count += 1

[kerzol81]

Hi, I think it's gonna extract ALL the frames from the video file. I just need the first frame so I modified it this way:

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def getFirstFrame(videofile):     vidcap = cv2.VideoCapture(videofile)     success, image = vidcap.read()     if success:         cv2.imwrite("first_frame.jpg", image)  # save frame as JPEG file

Thanks for the hint!