Python 选择BeagleBone Black上的超时错误

我正在运行Debian Wheezy:Linux beaglebone 3.8.13-bone79 1 SMP Tue Oct 13 20:44:55 UTC 2015 armv7l GNU/Linux的BBB上测试opencv视频捕获代码，但每次运行程序时都会出现选择超时错误。现在我落后于我最后一年虹膜识别系统项目的进度。如果你想知道我为什么要看这个视频捕获代码，它是用来跟踪眼睛，然后捕获一个图像，然后进行处理以获得虹膜编码

我按照上的说明安装了opencv 3.0.0，但不得不关闭其中一个论坛上建议的ffmpeg：在获得编译错误后，但首先我从源代码编译了ffmpeg

下面是我测试的视频捕获代码

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):
     # Capture frame-by-frame
     ret, frame = cap.read()

 # Our operations on the frame come here
 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

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

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

运行代码后，我获得了以下信息注意：只有在通过tightvnc访问的LXTerminal中运行python脚本时，框架才会打开。它无法通过ssh运行

root@beaglebone:~/Project/Testing# python Video_Streaming.py

(process:1488): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.
Xlib:  extension "RANDR" missing on display ":1".
select timeout
select timeout
select timeout
select timeout
^Cselect timeout
Traceback (most recent call last):
  File "Video_Streaming.py", line 8, in <module>
    ret, frame = cap.read()
KeyboardInterrupt
root@beaglebone:~/Project/Testing#

我被困住了，我需要你的帮助