[vlc-devel] Hot keys to log timestamp parts of video

[John Hammer]

> You mean visually?

Yes. Basically while watching the video pressing the key manually should
log timestamps to a file. There will be 2 keys one for start timestamp and
one for end timestamp. The goal is to log the timestamps of interesting
parts of the video for external processing.

> There are time events reported by the core that you can hook into to know
where you are.

I could modify the Qt GUI module and could listen to the key presses. The
following is the patch that works. Where is the time event hook? Does this
mean I have to store the keypress event for later processing in the time
hook event?

diff --git a/modules/gui/qt/main_interface.cpp
b/modules/gui/qt/main_interface.cpp
index a57506533d..cd1ebad916 100644
--- a/modules/gui/qt/main_interface.cpp
+++ b/modules/gui/qt/main_interface.cpp
@@ -28,7 +28,7 @@
 #endif

 #include "qt.hpp"
-
+#include <QDebug>
 #include "main_interface.hpp"
 #include "input_manager.hpp"                    // Creation
 #include "actions_manager.hpp"                  // killInstance
@@ -72,6 +72,7 @@

 #include <QTimer>

+
 #include <vlc_actions.h>                    /* Wheel event */
 #include <vlc_vout_display.h>               /* vout_thread_t and VOUT_
events */

@@ -1612,6 +1613,17 @@ void MainInterface::dragLeaveEvent(QDragLeaveEvent
*event)
  ************************************************************************/
 void MainInterface::keyPressEvent( QKeyEvent *e )
 {
+    switch (e->key()) {
+    case Qt::Key_End:
+    case Qt::Key_1:
+      qDebug()<<e<<" start timestamp \n";
+      break;
+    case Qt::Key_PageDown:
+    case Qt::Key_2:
+      qDebug()<<e<<" end timestamp \n";
+      break;
+    }
+
     handleKeyPress( e );

Thanks,
John

On Mon, Mar 7, 2022 at 2:02 PM Steve Lhomme <robux4 at ycbcr.xyz> wrote:

>
>
> On 2022-03-05 19:01, John Hammer wrote:
> > Hi,
> >     I want to retrieve the start and end timestamp of parts of the video
> > for post-processing with an external program. Since Lua extension does
>
> You mean visually ? There are time events reported by the core that you
> can hook into to know where you are.
>
> > not support keybindings, I have decided to modify the source code. I
> > could compile the 3.x branch and debug the qt module interface. It looks
> > like this in the keypress event callbacks of this module is where the
> > code to log the timestamps should go.
> >
> >      Am I on the right track on implementing this feature or is there
> > any other way?
> >
> >     I also would like to color the areas on the time slider where the
> > start and end timestamps occurred. I have no idea how to achieve this.
> > Any suggestions on which module to be changed to achieve this?
>
> If you want to change the UI you have to modify the Qt gui module/
>
> > --
> > Thanks,
> > John
> >
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-- 
Regards
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