3 This script will test highgui's cvRetrieveFrame function
6 # name of this test and it's requirements
7 TESTNAME = "cvRetrieveFrame"
8 REQUIRED = ["cvGrabFrame"]
11 # needed for sys.exit(int) and .works file handling
16 # path to imagefiles we need
17 PREFIX=os.environ["top_srcdir"]+"/tests/python/testdata/videos/"
19 # check requirements and delete old flag file, if it exists
20 if not works.check_files(REQUIRED,TESTNAME):
23 # import the necessary things for OpenCV
25 from python.highgui import *
26 from python.cv import *
29 # create a video reader using the tiny video 'uncompressed.avi'
30 video = cvCreateFileCapture(PREFIX+"uncompressed.avi")
32 # call cvGrabFrame to grab a frame from video
33 res=cvGrabFrame(video)
36 print "(ERROR) Couldn't call cvGrabFrame()"
38 # call cvRetrieveFrame and check if returned image is valid
39 image = cvRetrieveFrame(video)
42 # returned image is not a correct IplImage (pointer),
43 # so return an error code
47 # ATTENTION: We do not release the video reader or image.
48 # This is bad manners, but Python and OpenCV don't care...
50 # create flag file for sollowing tests
51 works.set_file(TESTNAME)