Merge pull request #4755 from OpenShot/display-playback-speed

I'm interested to discuss the design principles of this, but I think it makes sense for an object to control it's own title. Anyway, going ahead with this quick fix for now.

Author: JacksonRG

src/windows/video_widget.py

@@ -275,6 +275,12 @@ def update_title(self):
         rect = self.centeredViewport(self.width(), self.height())
         scale = self.devicePixelRatioF()
 
+        # Display the playback speed in widget title
+        speed = 0.0
+        mode = self.win.preview_thread.player.Mode()
+        if mode != openshot.PLAYBACK_PAUSED:
+            speed = self.win.preview_thread.player.Speed()
+
         # Find parent dockWidget (if any)
         dock = None
         if self.parent() and self.parent().parent():
@@ -286,12 +292,15 @@ def update_title(self):
 
         if self.settings.get("preview-fps"):
             # Update window title with FPS output
-            dock.setWindowTitle(_("Video Preview") + " " + _("(Paint: %d FPS, Render: %d FPS, %dx%d)")
-                                                      % (self.paint_fps, self.present_fps,
+            dock.setWindowTitle(_("Video Preview ") + _("(Speed: %dx, Paint: %d FPS, Render: %d FPS, %dx%d)")
+                                                      % (speed, self.paint_fps, self.present_fps,
                                                          rect.width() * scale, rect.height() * scale))
         else:
             # Restore window title
-            dock.setWindowTitle(_("Video Preview"))
+            if not speed in [1, 0, -1]:
+                dock.setWindowTitle(_("Video Preview") + f" ({speed}x)")
+            else:
+                dock.setWindowTitle(_("Video Preview"))
 
     def paintEvent(self, event, *args):
         """ Custom paint event """
@@ -1465,6 +1474,13 @@ def __init__(self, watch_project=True, *args):
         # Get a reference to the window object
         self.win = get_app().window
 
+        # Update title whenever playback speed changes.
+        self.win.PlaySignal.connect(self.update_title, Qt.QueuedConnection)
+        self.win.PlaySignal.connect(self.update_title, Qt.QueuedConnection)
+        self.win.PauseSignal.connect(self.update_title, Qt.QueuedConnection)
+        self.win.SpeedSignal.connect(self.update_title, Qt.QueuedConnection)
+        self.win.StopSignal.connect(self.update_title, Qt.QueuedConnection)
+
         # Show Property timer
         # Timer to use a delay before sending MaxSizeChanged signals (so we don't spam libopenshot)
         self.delayed_resize_timer = QTimer(self)