[longomatch/0.20] Fix exception when the capturer fails to ge a frame

[Andoni Morales Alastruey <amorales src gnome org>]

commit ddaf694b7b0d179c48f8c3aa3c790c6ca5853f88
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Fri Aug 15 14:50:23 2014 +0200

    Fix exception when the capturer fails to ge a frame

 .../Services/RenderingJobsManager.cs               |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)
---
diff --git a/LongoMatch.Services/Services/RenderingJobsManager.cs 
b/LongoMatch.Services/Services/RenderingJobsManager.cs
index d520637..daf8717 100644
--- a/LongoMatch.Services/Services/RenderingJobsManager.cs
+++ b/LongoMatch.Services/Services/RenderingJobsManager.cs
@@ -16,6 +16,7 @@
 //  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 // 
 using System;
+using System.Threading;
 using System.Collections.Generic;
 using Mono.Unix;
 
@@ -188,19 +189,21 @@ namespace LongoMatch.Services
                        
                        Log.Debug(String.Format("Adding segment with {0} drawings", segment.Drawings.Count));
                        if (segment.Drawings.Count >= 1) {
-                               Drawing drawing = segment.Drawings[0];
-                               string image_path = CreateStillImage(segment.MediaFile.FilePath, drawing);
                                
+                               Drawing drawing = segment.Drawings[0];
                                videoEditor.AddSegment(segment.MediaFile.FilePath,
                                                       segment.Start.MSeconds,
                                                       drawing.RenderTime - segment.Start.MSeconds,
                                                       segment.Rate,
                                                       segment.Name,
                                                       segment.MediaFile.HasAudio);
-                               videoEditor.AddImageSegment(image_path,
+                               string image_path = CreateStillImage(segment.MediaFile.FilePath, drawing);
+                               if (image_path != null) {
+                                       videoEditor.AddImageSegment(image_path,
                                                            drawing.RenderTime,
                                                            drawing.PauseTime,
                                                            segment.Name);
+                               }
                                videoEditor.AddSegment(segment.MediaFile.FilePath,
                                                       drawing.RenderTime,
                                                       segment.Stop.MSeconds - drawing.RenderTime,
@@ -225,6 +228,13 @@ namespace LongoMatch.Services
                        capturer.Open(filename);
                        capturer.SeekTime(drawing.RenderTime, true);
                        frame = capturer.GetCurrentFrame();
+                       if (frame == null) {
+                           Thread.Sleep (200);
+                           frame = capturer.GetCurrentFrame();
+                           if (frame == null) {
+                               return null;
+                           }
+                       }
                        final_image = Image.Composite(frame, drawing.Pixbuf);
                        final_image.Save(path);
                        return path;