From Brad Colbert, "Added a new method to ImageStream called getLength that is used to

return the length of the stream.

Implemented the virtual methods in QuicktimeImageStream, (getLength,
getReferenceTime, setTimeMultiplier), to return valid value for each.
"

include/osg/ImageStream

@@ -67,6 +67,8 @@ class OSG_EXPORT ImageStream : public Image
         LoopingMode getLoopingMode() const { return _loopingMode; }
 
 
+        virtual double getLength() const { return 0.0; }
+        
         virtual void setReferenceTime(double) {}
         virtual double getReferenceTime() const { return 0.0; }