--- a/python/cvutils.py	Tue Jun 26 10:15:11 2012 -0400
+++ b/python/cvutils.py	Wed Jun 27 09:52:06 2012 -0400
@@ -92,14 +92,15 @@
         for i in range(0, last-1):
             cv2.line(img, positions[i].asint().astuple(), positions[i+1].asint().astuple(), color)
 
-    def playVideo(filename, firstFrame = 0):
+    def playVideo(filename, firstFrameNum = 0):
         '''Plays the video'''
         capture = cv2.VideoCapture(filename)
         if capture.isOpened():
             key = -1
-            frameNum = 1
-            capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrame)
-            while key!= 113: # 'q'
+            ret = True
+            frameNum = firstFrameNum
+            capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
+            while ret and key!= 113: # 'q'
                 ret, img = capture.read()
                 if ret:
                     print('frame {0}'.format(frameNum))
@@ -128,16 +129,19 @@
                         images.append(img)
         return images
 
-    def displayTrajectories(videoFilename, objects, homography = None):
+    def displayTrajectories(videoFilename, objects, homography = None, firstFrameNum = 0):
         '''Displays the objects overlaid frame by frame over the video '''
         capture = cv2.VideoCapture(videoFilename)
         if capture.isOpened():
             key = -1
-            frameNum = 0
-            while key!= 113: # 'q'
+            ret = True
+            frameNum = firstFrameNum
+            capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
+            while ret and key!= 113: # 'q'
+                print('capture')
                 ret, img = capture.read()
                 if ret:
-                    print(frameNum)
+                    print('frame {0}'.format(frameNum))
                     for obj in objects:
                         if obj.existsAtInstant(frameNum):
                             if obj.getFirstInstant() == frameNum: