我正在尝试从网络摄像头(Logitech c210)捕获视频并从中创建视频文件。
这是在 Raspbian Wheezy 2013-05-25 上。
相机上的灯亮了大约 30 秒,但没有创建文件。我已经在 OpenCV 窗口中显示了网络摄像头。
我想知道这是否是编解码器问题,因为脚本在带有 -1 参数的 Windows 上工作?
如果是这样,是否有任何推荐的 Raspberry Pi 编解码器?
如果我购买 mpeg2 编解码器,那行得通吗?
我已经列出了我尝试过的编解码器,虽然没有工作。
脚本如下:
import cv2
import time
def InitialiseCamera():
camera = cv2.VideoCapture(0)
if camera is None:
print('Warning: unable to access camera')
else:
print('initialized camera')
return camera
def InitialiseWriter():
fps = 5
size = (640, 480)
destinationFile = 'video.avi'
# These are the codecs I've tried so far
codec = cv2.cv.CV_FOURCC('I','4','2','0')
#codec = cv2.cv.CV_FOURCC('A','V','C','1')
#codec = cv2.cv.CV_FOURCC('Y','U','V','1')
#codec = cv2.cv.CV_FOURCC('P','I','M','1')
#codec = cv2.cv.CV_FOURCC('M','J','P','G')
#codec = cv2.cv.CV_FOURCC('M','P','4','2')
#codec = cv2.cv.CV_FOURCC('D','I','V','3')
#codec = cv2.cv.CV_FOURCC('D','I','V','X')
#codec = cv2.cv.CV_FOURCC('U','2','6','3')
#codec = cv2.cv.CV_FOURCC('I','2','6','3')
#codec = cv2.cv.CV_FOURCC('F','L','V','1')
#codec = cv2.cv.CV_FOURCC('H','2','6','4')
#codec = cv2.cv.CV_FOURCC('A','Y','U','V')
#codec = cv2.cv.CV_FOURCC('I','U','Y','V')
#codec = -1
video = cv2.VideoWriter(destinationFile, codec, fps, size, True);
if video is None:
print('Warning: unable to create video writer')
else:
print('initialized writer')
return video
def CaptureVideo(c,w):
i = 0
while i<150:
i+=1
f,img = c.read()
try:
w.write(img)
except:
print "Unexpected error: ", sys.exec_info()[0]
print('complete')
c.release()
if __name__ == '__main__':
cam = InitialiseCamera()
writer = InitialiseWriter()
CaptureVideo(cam,writer)