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我试图从ip摄像头捕获视频并保存为avi视频文件。同时脚本将包含面部的帧保存为jpeg文件。虽然脚本正在做这些工作,但CPU使用率大约是100%。正因为如此,我想限制帧速率只在人脸检测。在python和opencv上限制视频捕获帧率
我的代码是:
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
now = datetime.datetime.now()
strtime = str(now)
cap = cv2.VideoCapture('rtsp://root:[email protected]:554/stream/profile1=r')
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('1/video/%s.avi' % strtime,fourcc, 10.0 , (960,540))
if cap.isOpened():
while(True):
if cap.set(cv2.CAP_PROP_FPS,4):
try:
ret, frame = cap.read()
if ret==True:
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
out.write(frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
faces = face_cascade.detectMultiScale(gray,
scaleFactor=1.5,
minNeighbors=6,
minSize=(30,30))
for (x,y,w,h) in faces:
cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),
cv2.imwrite('1/frames/%sf%s.jpg'%(now,str(cap.get(cv2.CAP_PROP_POS_FRAMES))), frame)
cv2.imshow('frame', frame)
except KeyboardInterrupt:
cap.release()
out.release()
cv2.destroyAllWindows()
sys.exit(0)
pass
else:
print "Unable to connect"
cap.release()
out.release()
cv2.destroyAllWindows()
sys.exit(0)
我已经在许多不同的地方(2 cv2.CAP_PROP_FPS)试图cv2.VideoCapture.set,但没有奏效。有什么办法可以限制视频捕捉fps吗?