我在许多网站上(包括stack overflow)搜索了解决我的问题的方案。我正在尝试使用OpenCV从我的树莓派上的网络摄像头保存视频。从理论上讲,我的代码运行正常(我可以在窗口中看到我的网络摄像头,我可以看到python打印“frame”),但当它转到保存文件时,我看不到任何东西。我发现我应该更改FourCC中的编解码器,但它没有改变任何东西。
我的代码:
我的代码:
#!/usr/bin/python
import cv2
import numpy as np
def InitCamera():
cap = cv2.VideoCapture(0)
if cap is None:
print('No camera access')
else:
print('Camera init done')
return cap
def InitWriter():
fps = 20
size = (640,480)
outFile = 'output.mp4'
#fourcc = cv2.cv.CV_FOURCC('D','I','V','X')
#fourcc = cv2.cv.CV_FOURCC('R','G','B',' ')
#fourcc = cv2.cv.CV_FOURCC('Y','U','Y','2')
#fourcc = cv2.cv.CV_FOURCC('Y','U','Y','U')
#fourcc = cv2.cv.CV_FOURCC('U','Y','V','Y')
#fourcc = cv2.cv.CV_FOURCC('I','4','2','0')
#fourcc = cv2.cv.CV_FOURCC('I','Y','U','V')
#fourcc = cv2.cv.CV_FOURCC('Y','U','1','2')
#fourcc = cv2.cv.CV_FOURCC('Y','8','0','0')
#fourcc = cv2.cv.CV_FOURCC('G','R','E','Y')
#fourcc = cv2.cv.CV_FOURCC('B','Y','8',' ')
#fourcc = cv2.cv.CV_FOURCC('Y','1','6',' ')
#fourcc = cv2.cv.CV_FOURCC('X','V','I','D')
#fourcc = cv2.cv.CV_FOURCC('M','J','P','G')
fourcc = cv2.cv.CV_FOURCC('M','P','E','G')
out = cv2.VideoWriter(outFile, fourcc, fps, size, 1)
if out is None:
print('No video access')
else:
print('Video init done')
return out
def CapVideo(cap,out):
while(cap.isOpened()):
ret, frame = cap.read()
if ret==True:
out.write(frame)
print('frame')
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF==ord('q'):
break
else:
break
print 'Done'
cap.release()
out.release()
cv2.destroyAllWindows()
if __name__ == '__main__':
cam = InitCamera()
out = InitWriter()
CapVideo(cam,out)