[chronojump] ffplay Linux show pts time on play video

[Xavier de Blas <xaviblas src gnome org>]

commit 1064ceccac7cb5b03c67f7e40ea02179dc5b1ac3
Author: Xavier de Blas <xaviblas gmail com>
Date:   Sat Jun 15 18:04:23 2019 +0200

    ffplay Linux show pts time on play video

 src/webcamFfmpeg.cs | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/src/webcamFfmpeg.cs b/src/webcamFfmpeg.cs
index 872d2275..21ddd408 100644
--- a/src/webcamFfmpeg.cs
+++ b/src/webcamFfmpeg.cs
@@ -276,9 +276,19 @@ public class WebcamFfmpeg : Webcam
        private List<string> createParametersPlayFile(string filename)
        {
                // ffplay -autoexit out.mp4
+               // experimental on Linux to show pts time (not length percentage)
+               // ffplay -vf "drawtext=text='%{pts\:hms}':box=1:x=(w-tw)/2:y=h-(2*lh)" -autoexit out.mp4
+
                List<string> parameters = new List<string>();
-               parameters.Insert (0, "-autoexit");
-               parameters.Insert (1, filename);
+               int i=0;
+
+               if(os == UtilAll.OperatingSystems.LINUX) { //TODO: check if this works on Mac and Windows
+                       parameters.Insert (i++, "-vf");
+                       parameters.Insert (i++, "drawtext=text='%{pts\\:hms}':box=1:x=(w-tw)/2:y=h-(2*lh)");
+               }
+
+               parameters.Insert (i ++, "-autoexit");
+               parameters.Insert (i ++, filename);
                return parameters;
        }