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[英]Using Raspberry Pi + Webcam to record video in python, but sometimes camera does not turn on/off as I expected
[英]Using Raspberry Pi + Webcam to record video in python always gets an empty video or only one frame video
我想用Raspberry Pi + wedcam(logitech)录制视频。 尽管我发现了许多示例,这些示例实际上与以下代码几乎相同:
import numpy as np
import cv2
path = ('/.../output.avi')
fourcc = cv2.cv.CV_FOURCC(*'XVID')
out = cv2.VideoWriter(path,fourcc, 20.0, (640,480))
while(cap.isOpened()):
#read the frame
ret, frame = cap.read()
if ret==True:
#Write the frame
video_writer.write(frame)
#show the frame
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
# Release everything if job is finished
cap.release()
video_writer.release()
cv2.destroyAllWindows()
第一个问题,我尝试了从OpenCV编写框架到文件python的所有解决方案,但似乎这些解决方案不适合我...所以我想知道是否有人对此问题有其他解决方案,我将不胜感激! 第二个问题,我发现有人使用
cv2.VideoWriter_fourcc('XVID')
代替
cv2.cv.CV_FOURCC(*'XVID')
那会是问题吗? 另外,我尝试使用cv2.VideoWriter_fourcc('XVID'),但收到错误消息:'module'对象没有属性'VideoWriter_fourcc'...我该如何解决? 谢谢!
您使用“ out”创建了视频编写器对象
out = cv2.VideoWriter(path,fourcc, 20.0, (640,480))
因此,也许您应该将video_writer.write(frame)
替换为out.write(frame)
还要用video_writer.release()
替换out.release()
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