[英]Python and OpenCV - Cannot write readable avi video files
我有这样的代码:
import numpy as np
import cv2
cap = cv2.VideoCapture('C:/Users/Hilman/haatsu/drive_recorder/sample/3.mov')
# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi', fourcc, 20.0, (640,480))
while(cap.isOpened()):
ret, frame = cap.read()
if ret==True:
frame = cv2.flip(frame,0)
# write the flipped frame
out.write(frame)
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()
但是无法播放output.avi
。
尝试也将out = cv2.VideoWriter('output.avi', fourcc, 20.0, (640,480))
更改为这样的东西(如某些人所建议的) out = cv2.VideoWriter('output.avi', -1, 20.0, (640,480))
。 但是当我这样做时,我得到了这个消息
OpenCV: FFMPEG: tag 0xffffffff/' ' is not found (format 'avi / AVI (Audio Video Interleaved)')'
。
可能是什么问题呢? 我顺便使用Windows 10。
我也无法在我的Windows 10机器上运行该代码。
所以这就是我做的:
ffmpeg
的文件夹 C:\\ffmpeg\\bin;
ffmpeg -version
_
import numpy as np
import cv2
import os
base_path = 'C:\\Users\\Hilman\\haatsu\\drive_recorder\\sample\\'
cap = cv2.VideoCapture('%s3.mov' % base_path)
i = 0
while(cap.isOpened()):
ret, frame = cap.read()
if ret==True:
frame = cv2.flip(frame,0)
cv2.imwrite(os.path.join(base_path, str(i) + '.png'), frame)
i = i + 1
else:
break
# Release everything if job is finished
cap.release()
C:\\Users\\Hilman\\haatsu\\drive_recorder\\sample
打开命令提示符并运行以下命令: ffmpeg -framerate 29 -i %d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
out.mp4
。 我在Ubuntu 14.04上使用OpenCV 2.4.9,以下代码对我来说很好用:
import cv2
import cv
cap = cv2.VideoCapture(0)
ret,img=cap.read()
height , width , layers = img.shape
fps=20
video = cv2.VideoWriter("rec_out.avi", cv.CV_FOURCC(*'DIVX'), fps, (img.shape[1], img.shape[0]))
while True:
ret,img=cap.read()
height , width , layers = img.shape
video.write(img)
cv2.imshow('Video', img)
#video.write(img)
if(cv2.waitKey(10) & 0xFF == ord('b')):
break
cv2.destroyAllWindows()
video.release()
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