如何设置时间间隔以从输入视频中获取帧？

Question

我正在尝试从特定时间的输入视频中获取帧 interval.so 向我建议任何对 me.Tell 我如何在以下代码中设置时间限制有帮助的解决方案。

import cv2

vidcap = cv2.VideoCapture('baahubali2.mp4')
vidcap.set(cv2.CAP_PROP_POS_MSEC,1000)

success, image = vidcap.read()
count = 0
success = True

while success:
    success, image = vidcap.read()
    print('Read a new frame: ', success)
    cv2.imwrite("/home/kapil/Documents/major/image/frame%d.jpg" % count, image)     
    count += 1

Answer 1

这是一种解决方案：

import cv2


start_time_ms = 1000
stop_time_ms = 2000
vidcap = cv2.VideoCapture('baahubali2.mp4')


count = 0
success = True

while success and vidcap.get(cv2.cv.CV_CAP_PROP_POS_MSEC) < start_time_ms:
    success, image = vidcap.read()

while success and vidcap.get(cv2.cv.CV_CAP_PROP_POS_MSEC) <= stop_time_ms:
    success, image = vidcap.read()
    print('Read a new frame: ', success)
    cv2.imwrite("/home/kapil/Documents/major/image/frame%d.jpg" % count, image)    
    count += 1

开始和停止时间以毫秒为单位指定。在 start_time_ms 之前读取帧什么也不做，然后将帧作为图像写入，直到 stop_time_ms 或视频结束。

Answer 2

import cv2
start_time_ms = 120000
stop_time_ms = 150000
vidcap = cv2.VideoCapture('/content/Players Hunting on Neymar Lionel Messi 
                            Cristiano Ronaldo ● Horror Fouls &amp Tackles HD.mp4')

count = 0
success = True
vidcap.set(cv2.CAP_PROP_POS_MSEC,start_time_ms)
while success and vidcap.get(cv2.CAP_PROP_POS_MSEC) <= stop_time_ms:
  success, image = vidcap.read()
  print('Read a new frame: ', success)
  cv2.imwrite("/content/image/frame%d.jpg" % count, image)    
  count += 1

Answer 3

这是我用来获取输出的解决方案，我认为它会有所帮助

import cv2

import os

cap = cv2.VideoCapture(vidoname)

time_skips = float(2000) #skip every 2 seconds. You 
need to modify this

count = 0
success,image = cap.read()
while success:
    cv2.imwrite("frame%d.jpg" % count, image)     
    cap.set(cv2.CAP_PROP_POS_MSEC, 
    (count*time_skips))    
    # move the time
    success,image = cap.read()
    count += 1

# release after reading    
cap.release()

如何设置时间间隔以从输入视频中获取帧？

How to set time interval to get frames from input video?

python

opencv

image-processing

video-streaming

opencv3.1