--- a/python/metadata.py	Tue Jul 05 13:56:13 2016 -0400
+++ b/python/metadata.py	Wed Jul 06 10:18:35 2016 -0400
@@ -164,17 +164,19 @@
     cameraTypeIdx = Column(Integer, ForeignKey('camera_types.idx'))
     trackingConfigurationFilename = Column(String) # path to configuration .cfg file, relative to site name
     maskFilename = Column(String) # path to mask file, relative to site name
+    virtual = Column(Boolean) # indicates it is not a real camera view, eg merged
     
     site = relationship("Site", backref=backref('sites', order_by = idx))
     cameraType = relationship('CameraType', backref=backref('camera_views', order_by = idx))
 
-    def __init__(self, description, homographyFilename, site, cameraType, trackingConfigurationFilename, maskFilename):
+    def __init__(self, description, homographyFilename, site, cameraType, trackingConfigurationFilename, maskFilename, virtual = False):
         self.description = description
         self.homographyFilename = homographyFilename
         self.site = site
         self.cameraType = cameraType
         self.trackingConfigurationFilename = trackingConfigurationFilename
         self.maskFilename = maskFilename
+        self.virtual = virtual
 
     def getHomographyFilename(self, relativeToSiteFilename = True):
         if relativeToSiteFilename:
@@ -232,11 +234,12 @@
     startTime = Column(DateTime)
     duration = Column(Interval) # video sequence duration
     databaseFilename = Column(String) # path relative to the the site name
+    virtual = Column(Boolean) # indicates it is not a real video sequence (no video file), eg merged
     cameraViewIdx = Column(Integer, ForeignKey('camera_views.idx'))
 
     cameraView = relationship("CameraView", backref=backref('video_sequences', order_by = idx))
 
-    def __init__(self, name, startTime, duration, cameraView, databaseFilename = None):
+    def __init__(self, name, startTime, duration, cameraView, databaseFilename = None, virtual = False):
         '''startTime is passed as string in utils.datetimeFormat, eg 2011-06-22 10:00:39
         duration is a timedelta object'''
         self.name = name
@@ -248,6 +251,7 @@
         self.cameraView = cameraView
         if databaseFilename is None and len(self.name) > 0:
             self.databaseFilename = removeExtension(self.name)+'.sqlite'
+        self.virtual = virtual
 
     def getVideoSequenceFilename(self, relativeToSiteFilename = True):
         if relativeToSiteFilename: