阅读完的文档后VideoCapture。我发现您可以告诉VideoCapture，下次调用VideoCapture.read()（或VideoCapture.grab()）要处理哪个帧。
问题是，当您要准备read()一个尚未准备就绪的框架时，该VideoCapture对象会卡在该框架上而永远无法进行。因此，您必须强制其从上一帧重新开始。
这是代码
import cv2
cap = cv2.VideoCapture("./out.mp4")
while not cap.isOpened():
cap = cv2.VideoCapture("./out.mp4")
cv2.waitKey(1000)
print "Wait for the header"
pos_frame = cap.get(cv2.cv.CV_CAP_PROP_POS_FRAMES)
while True:
flag, frame = cap.read()
if flag:
# The frame is ready and already captured
cv2.imshow('video', frame)
pos_frame = cap.get(cv2.cv.CV_CAP_PROP_POS_FRAMES)
print str(pos_frame)+" frames"
else:
# The next frame is not ready, so we try to read it again
cap.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, pos_frame-1)
print "frame is not ready"
# It is better to wait for a while for the next frame to be ready
cv2.waitKey(1000)
if cv2.waitKey(10) == 27:
break
if cap.get(cv2.cv.CV_CAP_PROP_POS_FRAMES) == cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT):
# If the number of captured frames is equal to the total number of frames,
# we stop
break
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