python - OpenCV:完成后如何重新启动视频？

Question

我正在播放一个视频文件，但是播放结束后如何再次播放？

哈维尔

Answer 1

如果您想一遍又一遍地重新开始播放视频(也就是循环播放)，您可以在帧数达到 cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT) 时使用 if 语句来实现。然后重置帧数和 cap.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, num)到相同的值。我将 OpenCV 2.4.9 与 Python 2.7.9 结合使用，下面的示例不断为我循环播放视频。

import cv2

cap = cv2.VideoCapture('path/to/video') 
frame_counter = 0
while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()
    frame_counter += 1
    #If the last frame is reached, reset the capture and the frame_counter
    if frame_counter == cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT):
        frame_counter = 0 #Or whatever as long as it is the same as next line
        cap.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, 0)
    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

它也可以重新捕获视频而不是重置帧数:

if frame_counter == cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT):
    frame_counter = 0
    cap = cv2.VideoCapture(video_name)