在python中使用OpenCV 2.4.0创建视频

Question

我试图在python 2.7.2中使用OpenCV 2.4.0创建视频。但avi文件大小为0.

我代码:

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()总是返回false。

另一个尝试:

#!/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

无错误，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。详情请点击

Answer 2

找到这个代码，它为我工作(生成彩色噪声):

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()