我正在播放视频文件，但播放完毕后如何再次播放？
Javier
如果您想一遍又一遍地重新启动视频（也称为循环播放），可以通过在帧数达到时使用 if 语句来实现cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT)然后重置帧计数和cap.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, num)为相同的值。我使用 OpenCV 2.4.9 和 Python 2.7.9，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()
它还可以重新捕获视频而不是重置帧计数：
if frame_counter == cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT):
frame_counter = 0
cap = cv2.VideoCapture(video_name)
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