[chronojump] Better check if multimedia device is ok for capturing

[Xavier de Blas <xaviblas src gnome org>]

commit d067bb5c6ae699c83b5397cd224e8674e0a4224a
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Jul 18 14:35:56 2018 +0200

    Better check if multimedia device is ok for capturing

 src/gui/chronojump.cs | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)
---
diff --git a/src/gui/chronojump.cs b/src/gui/chronojump.cs
index af5efa26..04576930 100644
--- a/src/gui/chronojump.cs
+++ b/src/gui/chronojump.cs
@@ -3839,8 +3839,17 @@ public partial class ChronoJumpWindow
                image_video_no.Visible = ! myVideo;
        }
        
-       private void on_checkbutton_video_clicked(object o, EventArgs args) {
-               if(checkbutton_video.Active) {
+       private void on_checkbutton_video_clicked(object o, EventArgs args)
+       {
+               if(checkbutton_video.Active)
+               {
+                       if(preferences.videoDevice == "" || preferences.videoDevice == "0")
+                       {
+                               new DialogMessage(Constants.MessageTypes.WARNING, "Video device is not 
configured. Check Preferences / Multimedia.");
+                               checkbutton_video.Active = false;
+                               return;
+                       }
+
                        preferences.videoOn = true;
                        SqlitePreferences.Update("videoOn", "True", false);
                } else {
@@ -3857,8 +3866,17 @@ public partial class ChronoJumpWindow
                videoCapturePrepare(true); //if error, show message
        }
 
-       private void on_checkbutton_video_encoder_clicked(object o, EventArgs args) {
-               if(checkbutton_video_encoder.Active) {
+       private void on_checkbutton_video_encoder_clicked(object o, EventArgs args)
+       {
+               if(checkbutton_video_encoder.Active)
+               {
+                       if(preferences.videoDevice == "" || preferences.videoDevice == "0")
+                       {
+                               new DialogMessage(Constants.MessageTypes.WARNING, "Video device is not 
configured. Check Preferences / Multimedia.");
+                               checkbutton_video_encoder.Active = false;
+                               return;
+                       }
+
                        preferences.videoOn = true;
                        SqlitePreferences.Update("videoOn", "True", false);
                } else {
@@ -4215,7 +4233,7 @@ public partial class ChronoJumpWindow
        {
                if(preferences.videoDevice == "" || preferences.videoDevice == "0")
                {
-                       new DialogMessage(Constants.MessageTypes.WARNING, "Video device is not configured. 
Check preferences / Multimedia.");
+                       new DialogMessage(Constants.MessageTypes.WARNING, "Video device is not configured. 
Check Preferences / Multimedia.");
                        return;
                }