OpenCV - 从黑魔法迷你录音机中捕捉镜头？

Question

将Black Magic Mini Recorder（Thunderbolt连接）的视频输入到OpenCV Mat（Python）的最佳方法是什么？

我使用的是Mac OS X El Capitan，Blackmagic Desktop Video SDK 10.7和OpenCV 3.0.0。

修改

我试过像这样使用VideoCapture：

cap = cv2.VideoCapture(0)

while(True):
    ret, frame = cap.read()

    cv2.imshow('frame',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

它给了我以下错误： （我认为这是因为cap是空的）

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /tmp/opencv3-20160626-61731-v18vfg/opencv-3.1.0/modules/highgui/src/window.cpp, line 281
Traceback (most recent call last):
  File "file.py", line 69, in <module>
    cv2.imshow('frame',frame)
cv2.error: /tmp/opencv3-20160626-61731-v18vfg/opencv-3.1.0/modules/highgui/src/window.cpp:281: error: (-215) size.width>0 && size.height>0 in function imshow

QTKit didn't find any attached Video Input Devices!
Warning, camera failed to properly initialize!
Cleaned up camera.

谢谢！