[longomatch] Fix wrong offset usage.

[Andoni Morales Alastruey <amorales src gnome org>]

commit 8a90a4d88afd746aa085eb979f813eb2f2314cd4
Author: Julien Moutte <julien fluendo com>
Date:   Sat Mar 14 13:48:54 2015 +0100

    Fix wrong offset usage.
    
    TimeNode.Start equals  - Offset.

 LongoMatch.Drawing/CanvasObjects/CameraObject.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/LongoMatch.Drawing/CanvasObjects/CameraObject.cs 
b/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
index 906a581..8c806ed 100644
--- a/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
+++ b/LongoMatch.Drawing/CanvasObjects/CameraObject.cs
@@ -27,7 +27,7 @@ namespace LongoMatch.Drawing.CanvasObjects
                MediaFile mediaFile;
 
                public CameraObject (MediaFile mf) : 
-                       base (new TimeNode () { Start = mf.Offset, Stop = mf.Duration + mf.Offset, Name = 
mf.Name })
+                       base (new TimeNode () { Start = new Time (-mf.Offset.MSeconds), Stop = mf.Duration - 
mf.Offset, Name = mf.Name })
                {
                        mediaFile = mf;
                        // Video boundaries can't be changed, only the segment can move.