[chronojump] playpreview and play with RunAtBackground (again)

[Xavier de Blas <xaviblas src gnome org>]

commit 7a08d7e853667b45e2194b624d9e520a88d9804e
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Feb 7 16:27:03 2019 +0100

    playpreview and play with RunAtBackground (again)

 src/gui/encoder.cs  |  2 +-
 src/webcamFfmpeg.cs | 16 ++++------------
 2 files changed, 5 insertions(+), 13 deletions(-)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index 56239a0c..59d3e8d4 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -2608,7 +2608,7 @@ public partial class ChronoJumpWindow
                                                new DialogMessage(Constants.MessageTypes.WARNING,
                                                                string.Format(
                                                                        Catalog.GetString("Sorry, parameter: 
'speed at 1RM' on exercise: '{0}' cannot be 0 for this analysis."),
-                                                                       eSQL.exerciseName) + "\n" +
+                                                                       eSQL.exerciseName) + "\n\n" +
                                                                Catalog.GetString("Please edit exercise 
parameters on capture tab."));
                                                return;
                                        }
diff --git a/src/webcamFfmpeg.cs b/src/webcamFfmpeg.cs
index dd8f1113..a84f5229 100644
--- a/src/webcamFfmpeg.cs
+++ b/src/webcamFfmpeg.cs
@@ -69,11 +69,8 @@ public class WebcamFfmpeg : Webcam
 
                List<string> parameters = createParametersPlayPreview();
 
-               //process = new Process();
-               //bool success = ExecuteProcess.RunAtBackground (ref process, executable, parameters, false, 
false, false);
-               ExecuteProcess.Result r = ExecuteProcess.run (executable, parameters);
-               return new Result(r.success, r.stdout, r.stderr);
-               /*
+               process = new Process();
+               bool success = ExecuteProcess.RunAtBackground (ref process, executable, parameters, false, 
false, false);
                if(! success)
                {
                        process = null;
@@ -82,7 +79,6 @@ public class WebcamFfmpeg : Webcam
 
                Running = true;
                return new Result (true, "");
-               */
        }
 
        public override Result PlayFile (string filename)
@@ -92,11 +88,8 @@ public class WebcamFfmpeg : Webcam
 
                List<string> parameters = createParametersPlayFile (filename);
 
-               //process = new Process();
-               //bool success = ExecuteProcess.RunAtBackground (ref process, executable, parameters, false, 
false, false);
-               ExecuteProcess.Result r = ExecuteProcess.run (executable, parameters);
-               return new Result(r.success, r.stdout, r.stderr);
-               /*
+               process = new Process();
+               bool success = ExecuteProcess.RunAtBackground (ref process, executable, parameters, false, 
false, false);
                if(! success)
                {
                        process = null;
@@ -105,7 +98,6 @@ public class WebcamFfmpeg : Webcam
 
                Running = true;
                return new Result (true, "");
-               */
        }
 
        public override bool Snapshot()