Work around video player black screen when looping & reduce player polling

video/FormPlayer.Designer.cs

@@ -36,6 +36,7 @@ private void InitializeComponent() {
             this.tablePanelCompactBottom = new System.Windows.Forms.TableLayoutPanel();
             this.tablePanelCompactTop = new System.Windows.Forms.TableLayoutPanel();
             this.labelTooltip = new TweetDuck.Video.Controls.LabelTooltip();
+            this.timerUI = new System.Windows.Forms.Timer(this.components);
             ((System.ComponentModel.ISupportInitialize)(this.trackBarVolume)).BeginInit();
             this.tablePanelFull.SuspendLayout();
             ((System.ComponentModel.ISupportInitialize)(this.imageResize)).BeginInit();
@@ -45,7 +46,7 @@ private void InitializeComponent() {
             // 
             // timerSync
             // 
-            this.timerSync.Interval = 15;
+            this.timerSync.Interval = 31;
             this.timerSync.Tick += new System.EventHandler(this.timerSync_Tick);
             // 
             // trackBarVolume
@@ -224,6 +225,12 @@ private void InitializeComponent() {
             this.labelTooltip.TabIndex = 3;
             this.labelTooltip.Visible = false;
             // 
+            // timerUI
+            // 
+            this.timerUI.Enabled = true;
+            this.timerUI.Interval = 200;
+            this.timerUI.Tick += new System.EventHandler(this.timerUI_Tick);
+            // 
             // FormPlayer
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -269,6 +276,7 @@ private void InitializeComponent() {
         private System.Windows.Forms.PictureBox imageClose;
         private System.Windows.Forms.TableLayoutPanel tablePanelCompactBottom;
         private System.Windows.Forms.TableLayoutPanel tablePanelCompactTop;
+        private System.Windows.Forms.Timer timerUI;
     }
 }
 

video/FormPlayer.cs

@@ -61,6 +61,7 @@ public FormPlayer(IntPtr handle, int dpi, int volume, string url, string token){
             Player.settings.setMode("loop", true);
 
             Player.PlayStateChange += player_PlayStateChange;
+            Player.PositionChange += player_PositionChange;
             Player.MediaError += player_MediaError;
             
             trackBarVolume.Value = volume; // changes player volume too if non-default
@@ -189,6 +190,21 @@ private void player_MediaError(object pMediaObject){
             Environment.Exit(Program.CODE_MEDIA_ERROR);
         }
 
+        private void player_PositionChange(double oldPosition, double newPosition){
+            timerUI_Tick(null, EventArgs.Empty);
+        }
+
+        private void timerUI_Tick(object sender, EventArgs e){
+            IWMPMedia media = Player.currentMedia;
+            IWMPControls controls = Player.controls;
+
+            string current = controls.currentPositionString;
+            labelTime.Text = $"{(string.IsNullOrEmpty(current) ? "00:00" : current)} / {media.durationString}";
+
+            Marshal.ReleaseComObject(media);
+            Marshal.ReleaseComObject(controls);
+        }
+
         [HandleProcessCorruptedStateExceptions]
         private void timerSync_Tick(object sender, EventArgs e){
             if (NativeMethods.GetWindowRect(ownerHandle, out NativeMethods.RECT rect)){
@@ -224,8 +240,6 @@ private void timerSync_Tick(object sender, EventArgs e){
                 }
                 
                 if (isCursorInside || isDragging){
-                    labelTime.Text = $"{controls.currentPositionString} / {media.durationString}";
-
                     int value = (int)Math.Round(progressSeek.Maximum * controls.currentPosition / media.duration);
 
                     if (value >= progressSeek.Maximum){
@@ -262,6 +276,9 @@ private void timerSync_Tick(object sender, EventArgs e){
                         // the controls.play() call even though it runs on the UI thread
                     }
                 }
+                else if (controls.currentPosition > media.duration - 0.05 && !isPaused){ // reset before it reaches the end to avoid black screen
+                    controls.currentPosition = 0;
+                }
                 
                 if (isCursorInside && !wasCursorInside){
                     wasCursorInside = true;