[問題] opencv Couldn't read movie file

[diesnow (0 0)]

環境如下：
IDE：Pycharm
python 2.7
ffmpeg v.2.5
OS: OSX 10.10.1

import numpy as np
import cv2

cap = cv2.VideoCapture('/Users/../test.mkv') <=這邊是用絕對路徑

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

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

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

cap.release()
cv2.destroyAllWindows()

========================================================
但是run下去結果是WARNING: Couldn't read movie file

請問要怎麼改善Orz

嘗試了很多種GOOGLE到的方法還是不行

感謝

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→ dritchie: http://stackoverflow.com/questions/16374633
→ zcxcxc20002: 最近我也遇到無法讀檔，我要讀avi，一直失敗，後來
→ zcxcxc20002: 直接改成mp4就可以了＠＠“