A simple VideoViewer

QuickLook.Plugin/QuickLook.Plugin.VideoViewer/PluginInterface.cs

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+using System;
+using System.IO;
+using System.Linq;
+using System.Windows;
+using Unosquare.FFmpegMediaElement;
+
+namespace QuickLook.Plugin.VideoViewer
+{
+    public class PluginInterface : IViewer
+    {
+        private ViewerPanel _vp;
+
+        public int Priority => int.MaxValue;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            var formats = new[]
+            {
+                ".3g2", ".3gp", ".3gp2", ".3gpp", ".amv", ".asf", ".asf", ".avi", ".flv", ".m2ts", ".m4v", ".mkv",
+                ".mov", ".mp4", ".mp4v", ".mpeg", ".mpg", ".ogv", ".qt", ".vob", ".webm", ".wmv"
+            };
+
+            if (formats.Contains(Path.GetExtension(path).ToLower()))
+                return true;
+
+            return false;
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            using (var element = new MediaElement {Source = new Uri(path)})
+            {
+                context.SetPreferredSizeFit(new Size(element.NaturalVideoWidth, element.NaturalVideoHeight), 0.6);
+            }
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            _vp = new ViewerPanel();
+
+            context.ViewerContent = _vp;
+
+            _vp.LoadAndPlay(path);
+
+            context.Title = $"{Path.GetFileName(path)} ({TimeSpan.FromSeconds(_vp.mediaElement.NaturalDuration).ToString(@"hh\:mm\:ss")}, {_vp.mediaElement.NaturalVideoWidth} × {_vp.mediaElement.NaturalVideoHeight} )";
+            context.IsBusy = false;
+        }
+
+        public void Dispose()
+        {
+            _vp?.Dispose();
+        }
+    }
+}