opencv `cv2` python 模块中缺少 CAP_PROP_FRAME_COUNT 常量
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CAP_PROP_FRAME_COUNT constant is missing in opencv `cv2` python module
提问by ProGM
How to access to CAP_PROP_FRAME_COUNTfrom opencv in python?
I tried this:
如何CAP_PROP_FRAME_COUNT在python中从opencv访问？我试过这个：
import cv2
cap = cv2.VideoCapture('myvideo.avi')
frames_count, fps, width, height = cap.get(cv2.CAP_PROP_FRAME_COUNT), cap.get(cv2.CAP_PROP_FPS), cap.get(cv2.CAP_PROP_FRAME_WIDTH), cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
And this:
和这个：
import cv2
import cv
cap = cv2.VideoCapture('myvideo.avi')
frames_count, fps, width, height = cap.get(cv.CAP_PROP_FRAME_COUNT), cap.get(cv.CAP_PROP_FPS), cap.get(cv.CAP_PROP_FRAME_WIDTH), cap.get(cv.CAP_PROP_FRAME_HEIGHT)
and also this:
还有这个：
import cv2
cap = cv2.VideoCapture('myvideo.avi')
frames_count, fps, width, height = cap.get(cv2.cv.CAP_PROP_FRAME_COUNT), cap.get(cv2.cv.CAP_PROP_FPS), cap.get(cv2.cv.CAP_PROP_FRAME_WIDTH), cap.get(cv2.cv.CAP_PROP_FRAME_HEIGHT)
But I'm getting this error:
但我收到此错误：
AttributeError: 'module' object has no attribute 'CAP_PROP_FRAME_COUNT'
I'm using python 2.7.5and OpenCV 2.4.9.
我正在使用python 2.7.5和OpenCV 2.4.9。
采纳答案by David Zwicker
The constants in the first version of OpenCV python module have a CV_prefix. You could thus either use cv.CV_CAP_PROP_FRAME_COUNTor cv2.cv.CV_CAP_PROP_FRAME_COUNT.
第一版 OpenCV python 模块中的常量有一个CV_前缀。因此，您可以使用cv.CV_CAP_PROP_FRAME_COUNT或cv2.cv.CV_CAP_PROP_FRAME_COUNT。
回答by 1kkwrds
import cv2
import cv2.cv as cv
Using cv2:
使用 cv2：
stream = cv2.VideoCapture(filename)
print stream.get(cv.CV_CAP_PROP_FRAME_COUNT)
回答by Alain Vega
#3. CV_CAP_PROP_FRAME_WIDTH
print "\t CAP_PROP_FRAME_WIDTH: ",cap.get(3)
#4. CV_CAP_PROP_FRAME_HEIGHT
print "\t CAP_PROP_FRAME_HEIGHT: ",cap.get(4)
#3. CV_CAP_PROP_FRAME_WIDTH
cap.set(3,320)
#4. CV_CAP_PROP_FRAME_HEIGHT
cap.set(4,240)
回答by extensa5620
While running macports on OSX (opencv @3.0.0_1+python27+tbb)
在 OSX 上运行 macports (opencv @3.0.0_1+python27+tbb)
You can get CAP_PROP_FRAME_HEIGHT and CAP_PROP_FRAME_WIDTH with the following:
您可以通过以下方式获得 CAP_PROP_FRAME_HEIGHT 和 CAP_PROP_FRAME_WIDTH：
#!/opt/local/bin/python
import cv2
vcap = cv2.VideoCapture()
# set frame width and height
vcap.set(cv2.CAP_PROP_FRAME_WIDTH, 480)
vcap.set(cv2.CAP_PROP_FRAME_HEIGHT, 640)
vcap.open(0)
回答by Qin Heyang
In OpenCV 2.x, these attributes are named starting with CV_...like CV_CAP_PROP_FRAME_COUNT.
在 OpenCV 2.x 中，这些属性以CV_...like开头CV_CAP_PROP_FRAME_COUNT。
In OpenCV 3.x and OpenCV 4.x, these attributes are named without CV_...like CAP_PROP_FRAME_COUNT.
在 OpenCV 3.x和 OpenCV 4.x 中，这些属性的名称不带CV_...like CAP_PROP_FRAME_COUNT。
