test_video_resource.py
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00001 #! /usr/bin/env python2
00002 # -*- coding: utf-8 -*-
00003 """
00004 
00005 Copyright (c) 2015 PAL Robotics SL.
00006 Released under the BSD License.
00007 
00008 Created on 7/14/15
00009 
00010 @author: Sammy Pfeiffer
00011 
00012 test_video_resource.py contains
00013 a testing code to see if opencv can open a video stream
00014 useful to debug if video_stream does not work
00015 """
00016 
00017 import cv2
00018 import sys
00019 
00020 if __name__ == '__main__':
00021     if len(sys.argv) < 2:
00022         print "You must give an argument to open a video stream."
00023         print "  It can be a number as video device, e.g.: 0 would be /dev/video0"
00024         print "  It can be a url of a stream,        e.g.: rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov"
00025         print "  It can be a video file,             e.g.: myvideo.mkv"
00026         exit(0)
00027 
00028     resource = sys.argv[1]
00029     # If we are given just a number, interpret it as a video device
00030     if len(resource) < 3:
00031         resource_name = "/dev/video" + resource
00032         resource = int(resource)
00033     else:
00034         resource_name = resource
00035     print "Trying to open resource: " + resource_name
00036     cap = cv2.VideoCapture(resource)
00037     if not cap.isOpened():
00038         print "Error opening resource: " + str(resource)
00039         print "Maybe opencv VideoCapture can't open it"
00040         exit(0)
00041 
00042     print "Correctly opened resource, starting to show feed."
00043     rval, frame = cap.read()
00044     while rval:
00045         cv2.imshow("Stream: " + resource_name, frame)
00046         rval, frame = cap.read()
00047         key = cv2.waitKey(20)
00048         # print "key pressed: " + str(key)
00049         # exit on ESC, you may want to uncomment the print to know which key is ESC for you
00050         if key == 27 or key == 1048603:
00051             break
00052     cv2.destroyWindow("preview")
00053 


video_stream_opencv
Author(s): Sammy Pfeiffer
autogenerated on Tue Nov 15 2016 07:17:35