是否在OpenCV中保存灰度视频? [英] Save grayscale video in OpenCV?
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问题描述
我正在尝试将视频保存为.avi
格式,但是我一直收到错误"could not demultiplex stream"
.我主要想保存灰度视频.
I am trying to save a video as .avi
format but i keep getting the error "could not demultiplex stream"
. I primarily want to save grayscale videos.
我需要使用任何特定的codec
吗?
Is there any specific codec
i need to use?
现在我尝试使用XVID, DIVX
import imutils
import cv2
import numpy as np
interval = 30
outfilename = 'output.avi'
threshold=100.
fps = 10
cap = cv2.VideoCapture("video.mp4")
ret, frame = cap.read()
height, width, nchannels = frame.shape
fourcc = cv2.cv.CV_FOURCC(*'DIVX')
out = cv2.VideoWriter( outfilename,fourcc, fps, (width,height))
ret, frame = cap.read()
frame = imutils.resize(frame, width=500)
frame = cv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)
while(True):
frame0 = frame
ret, frame = cap.read()
frame = imutils.resize(frame, width=500)
frame = cv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)
if not ret:
deletedcount +=1
break
if np.sum( np.absolute(frame-frame0) )/np.size(frame) > threshold:
out.write(frame)
else:
print "Deleted"
cv2.imshow('Feed - Press "q" to exit',frame)
key = cv2.waitKey(interval) & 0xFF
if key == ord('q'):
print('received key q' )
break
cap.release()
out.release()
print('Successfully completed')
推荐答案
对于Windows操作系统,请尝试:
For Windows OS try:
out = cv2.VideoWriter(outfilename, fourcc, fps, (width, height), 0)
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