--- a/scripts/play-video.py	Wed May 13 15:11:03 2015 +0200
+++ b/scripts/play-video.py	Wed May 13 17:24:19 2015 +0200
@@ -9,6 +9,7 @@
 parser.add_argument('-f', dest = 'firstFrameNum', help = 'number of first frame number to display', default = 0, type = int)
 parser.add_argument('--fps', dest = 'frameRate', help = 'approximate frame rate to replay', type = float)
 parser.add_argument('-r', dest = 'rescale', help = 'rescaling factor for the displayed image', default = 1., type = float)
+parser.add_argument('-s', dest = 'step', help = 'display every s image', default = 1, type = int)
 
 args = parser.parse_args()
 
@@ -20,4 +21,4 @@
 if args.frameRate is not None:
     frameRate = args.frameRate
 
-cvutils.playVideo(args.videoFilename, firstFrameNum, frameRate, rescale = args.rescale)
+cvutils.playVideo(args.videoFilename, firstFrameNum, frameRate, rescale = args.rescale, step = args.step)