Question

我正在尝试使用OpenCV 2.4.0中的python 2.7.2制作视频。但avi文件大小为0。

我的代码：

from cv2 import *

im1 = cv.LoadImage("1.jpg")

fps = 20
frame_size = cv.GetSize(im1)

#writer = cv.CreateVideoWriter("out.avi", CV_FOURCC('M', 'J', 'P', 'G'), fps, frame_size, True)

v = VideoWriter()

v.open("out.avi", cv.CV_FOURCC('F', 'M', 'P', '4'), fps, (800,600), True)
print v.isOpened()

isOpened()始终返回false。

另一次尝试：

#!/usr/bin/env python
import sys

from cv2 import *

im1 = cv.LoadImage("1.jpg")

if not im1:
    print "Error loading image"

im2 = cv.LoadImage("2.jpg")

if not im1:
    print "Error loading image"

fps = 20
frame_size = cv.GetSize(im1)

writer = cv.CreateVideoWriter("out.avi", cv.CV_FOURCC('M', 'J', 'P', 'G'), fps, frame_size, True)

if not writer:
    print "Error in creating video writer"
    sys.exit(1)
else:
    cv.WriteFrame(writer, im1)
    cv.WriteFrame(writer, im2)

del writer

没有错误，但输出为空。

我错过了什么？

Answer 1

import cv2

img1 = cv2.imread('1.jpg')
img2 = cv2.imread('2.jpg')
img3 = cv2.imread('3.jpg')

height , width , layers =  img1.shape

video = cv2.VideoWriter('video.avi',-1,1,(width,height))

video.write(img1)
video.write(img2)
video.write(img3)

cv2.destroyAllWindows()
video.release()

您想要做的简单代码。详情here

Answer 2

找到这段代码，对我有用（产生有色噪音）：

writer = cv2.VideoWriter("output.avi", cv2.VideoWriter_fourcc(*"MJPG"), 30,(640,480))
for frame in range(1000):
    writer.write(np.random.randint(0, 255, (480,640,3)).astype('uint8'))
writer.release()

来源：https://github.com/ContinuumIO/anaconda-issues/issues/223#issuecomment-285523938

Answer 3

height, width, layers = img.shape
out = cv2.VideoWriter("output.avi", cv2.VideoWriter_fourcc(*"XVID"), 30,(width,height))
out.write(img)
out.release()

在python中使用OpenCV 2.4.0创建视频

3 个答案: