[chronojump] Improvements on parse ffmpeg stdout on windows

[Xavier de Blas <xaviblas src gnome org>]

commit bc078fdc96de7d1f898497961ec750e70b25bee3
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Sep 20 12:43:27 2018 +0200

    Improvements on parse ffmpeg stdout on windows

 src/webcamFfmpeg.cs | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
---
diff --git a/src/webcamFfmpeg.cs b/src/webcamFfmpeg.cs
index 537d6ab2..93ff6500 100644
--- a/src/webcamFfmpeg.cs
+++ b/src/webcamFfmpeg.cs
@@ -234,6 +234,16 @@ public static class WebcamFfmpegGetDevicesWindows
                if(! execute_result.success)
                {
                        LogB.Information("WebcamFfmpegGetDevicesWindows error: " + execute_result.stderr);
+
+                       /*
+                        * on Windows the -i dummy produces an error, so stderr exists and success is false
+                        * stdout has the list of devices and stderr also
+                        * check if in stdout there's the: "DirectShow video devices" string and if not 
exists, really we have an error
+                        */
+                       if(execute_result.stdout != null && execute_result.stdout != "" &&
+                                       execute_result.stdout.Contains("DirectShow video devices"))
+                               return parse(execute_result.stdout);
+
                        return new List<string>();
                }
                else
@@ -260,7 +270,11 @@ public static class WebcamFfmpegGetDevicesWindows
        {
                LogB.Information("Called parse");
                LogB.Information("stdout: " + devicesOutput);
-               //https://stackoverflow.com/a/1547483
+
+               /*
+                * break the big string in \n strings
+                * https://stackoverflow.com/a/1547483
+                */
                string[] lines = devicesOutput.Split(
                                new[] { Environment.NewLine },
                                StringSplitOptions.None
@@ -275,6 +289,10 @@ public static class WebcamFfmpegGetDevicesWindows
                                LogB.Information("add match: " + match.ToString());
                                parsedList.Add(match.ToString());
                        }
+
+                       //after the list of video devices comes the list of audio devices, skip it
+                       if(l.Contains("DirectShow audio devices"))
+                               break;
                }
 
                return parsedList;