如何访问 Python 中的网络摄像头？

Question

I would like to access my webcam from Python.

I tried using the VideoCapture extension ( tutorial ), but that didn't work very well for me, I had to work around some problems such as it's a bit slow with resolutions >320x230, and sometimes it returns None for no apparent reason.

Is there a better way to access my webcam from Python?

Answer 1

OpenCV has support for getting data from a webcam, and it comes with Python wrappers by default, you also need to install numpy for the OpenCV Python extension (called cv2 ) to work. As of 2019, you can install both of these libraries with pip: pip install numpy pip install opencv-python

More information on using OpenCV with Python .

An example copied from Displaying webcam feed using opencv and python :

import cv2

cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)

if vc.isOpened(): # try to get the first frame
    rval, frame = vc.read()
else:
    rval = False

while rval:
    cv2.imshow("preview", frame)
    rval, frame = vc.read()
    key = cv2.waitKey(20)
    if key == 27: # exit on ESC
        break

vc.release()
cv2.destroyWindow("preview")

Answer 2

I would like to access my webcam from Python.

I tried using the VideoCapture extension ( tutorial ), but that didn't work very well for me, I had to work around some problems such as it's a bit slow with resolutions >320x230, and sometimes it returns None for no apparent reason.

Is there a better way to access my webcam from Python?

Answer 3

gstreamer can handle webcam input. If I remeber well, there are python bindings for it!

Answer 4

import cv2 as cv

capture = cv.VideoCapture(0)

while True:
    isTrue,frame = capture.read()
    cv.imshow('Video',frame)
    if cv.waitKey(20) & 0xFF==ord('d'):
        break

capture.release()
cv.destroyAllWindows()

0 <-- refers to the camera , replace it with file path to read a video file

cv.waitKey(20) & 0xFF==ord('d') <-- to destroy window when key is pressed

Answer 5

The only one I've used is VideoCapture, which you've already mentioned you don't like (although I had no problems with it; what bugs did you encounter?)

I was unable to find any alternatives in the past or now, so you might be stuck either using VideoCapture, or finding a nice C library and writing a Python wrapper for it (which might be more work than you're willing to put into it).