diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Converters.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Converters.cs
index 046e5eb..7ada61e 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Converters.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Converters.cs
@@ -67,7 +67,7 @@ namespace QuickLook.Plugin.VideoViewer
 
             var v = (bool) value;
 
-            return v ? Visibility.Visible : Visibility.Hidden;
+            return v ? Visibility.Visible : Visibility.Collapsed;
         }
 
         object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
@@ -81,11 +81,11 @@ namespace QuickLook.Plugin.VideoViewer
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             if (value == null)
-                return Visibility.Hidden;
+                return Visibility.Collapsed;
 
             var v = (bool) value;
 
-            return v ? Visibility.Hidden : Visibility.Visible;
+            return v ? Visibility.Collapsed : Visibility.Visible;
         }
 
         object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Plugin.cs
index 2812e30..c776c65 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Plugin.cs
@@ -28,7 +28,7 @@ namespace QuickLook.Plugin.VideoViewer
 {
     public class Plugin : IViewer
     {
-        private Size _mediaSize;
+        private FFprobe _probe;
         private ViewerPanel _vp;
 
         public int Priority => int.MaxValue;
@@ -46,24 +46,28 @@ namespace QuickLook.Plugin.VideoViewer
             if (Directory.Exists(path))
                 return false;
 
-            var blacklist = new[]
-            {
-                ".txt", ".jpg", ".bmp"
-            };
+            var blacklist = new[] {".txt", ".jpg", ".bmp", ".tiff"};
 
             if (blacklist.Contains(Path.GetExtension(path).ToLower()))
                 return false;
 
-            return new FFprobe(path).CanDecode();
+            var probe = new FFprobe(path);
+
+            // check if it is a APNG image
+            if (Path.GetExtension(path).ToLower() == ".png" && probe.GetFormatName().ToLower() != "apng")
+                return false;
+
+            return probe.CanDecode();
         }
 
         public void Prepare(string path, ContextObject context)
         {
             var def = new Size(450, 450);
 
-            _mediaSize = new FFprobe(path).GetViewSize();
+            _probe = new FFprobe(path);
+            var mediaSize = _probe.GetViewSize();
 
-            var windowSize = _mediaSize == Size.Empty ? def : _mediaSize;
+            var windowSize = mediaSize == Size.Empty ? def : mediaSize;
             windowSize.Width = Math.Max(def.Width, windowSize.Width);
             windowSize.Height = Math.Max(def.Height, windowSize.Height);
 
@@ -75,14 +79,13 @@ namespace QuickLook.Plugin.VideoViewer
             _vp = new ViewerPanel(context);
 
             context.ViewerContent = _vp;
-
-            Debug.WriteLine("ViewerContent done");
+            
             _vp.LoadAndPlay(path);
-            Debug.WriteLine("LoadAndPlay done");
 
             _vp.mediaElement.MediaOpened += (sender, e) => context.IsBusy = false;
 
-            var info = _mediaSize == Size.Empty ? "Audio" : $"{_mediaSize.Width}×{_mediaSize.Height}";
+            var mediaSize = _probe.GetViewSize();
+            var info = mediaSize == Size.Empty ? "Audio" : $"{mediaSize.Width}×{mediaSize.Height}";
 
             context.Title =
                 $"{Path.GetFileName(path)} ({info})";
@@ -90,6 +93,8 @@ namespace QuickLook.Plugin.VideoViewer
 
         public void Cleanup()
         {
+            _probe = null;
+
             _vp?.Dispose();
             _vp = null;
         }
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml
index dddf676..45c1b88 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml
@@ -44,8 +44,8 @@
             </Image.Style>
         </Image>
 
-        <Grid HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Height="100"
-              Visibility="{Binding NaturalDuration.HasTimeSpan, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityVisibleConverter}}">
+        <Grid HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Height="100">
+            <!--Visibility="{Binding NaturalDuration.HasTimeSpan, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityVisibleConverter}}"-->
             <Grid.Background>
                 <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                     <GradientStop Offset="0.0" Color="#00000000" />
@@ -90,10 +90,10 @@
             </Grid.Style>
 
             <Slider Grid.Row="1" x:Name="sliderProgress" Style="{StaticResource PositionSliderStyle}"
-                    IsEnabled="{Binding IsOpen, ElementName=mediaElement}"
                     SmallChange="{Binding FrameStepDuration, ElementName=mediaElement,Converter={StaticResource TimeSpanToSecondsConverter}}"
                     LargeChange="{Binding FrameStepDuration, ElementName=mediaElement, Converter={StaticResource TimeSpanToSecondsConverter}}"
                     Maximum="{Binding NaturalDuration, ElementName=mediaElement,Converter={StaticResource TimeSpanToSecondsConverter}}"
+                    Visibility="{Binding NaturalDuration.HasTimeSpan, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityVisibleConverter}}"
                     Value="{Binding Position, ElementName=mediaElement, Converter={StaticResource TimeSpanToSecondsConverter}}" />
 
             <Grid Grid.Row="2">
@@ -103,6 +103,7 @@
                     <ColumnDefinition Width="*" />
                 </Grid.ColumnDefinitions>
                 <StackPanel Grid.Column="0" VerticalAlignment="Center"
+                            Visibility="{Binding HasAudio, ElementName=mediaElement,Converter={StaticResource BooleanToVisibilityVisibleConverter}}"
                             Orientation="Horizontal" Margin="10,0,0,0">
                     <Grid x:Name="buttonMute" Style="{StaticResource ControlButtonStyle}">
                         <fa:ImageAwesome Height="23" Width="23" Foreground="#FFEFEFEF">
@@ -119,7 +120,7 @@
                             </fa:ImageAwesome.Style>
                         </fa:ImageAwesome>
                     </Grid>
-                    <Slider Style="{StaticResource CustomSliderStyle}" MaxWidth="75" Maximum="1"
+                    <Slider Style="{StaticResource CustomSliderStyle}" Width="75" Maximum="1"
                             Value="{Binding Volume, ElementName=mediaElement}"
                             Visibility="{Binding IsMuted, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityHiddenConverter}}"
                             BorderThickness="0,0,5,0" />
@@ -157,9 +158,11 @@
                             Orientation="Horizontal" Margin="0,0,10,0">
                     <TextBlock FontSize="14" Foreground="#FFEFEFEF"
                                Text="{Binding Position, StringFormat=hh\\:mm\\:ss, ElementName=mediaElement}" />
-                    <TextBlock FontSize="14" Text=" / " Foreground="#FFEFEFEF" />
+                    <TextBlock FontSize="14" Text=" / " Foreground="#FFEFEFEF"
+                               Visibility="{Binding NaturalDuration.HasTimeSpan, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityVisibleConverter}}" />
                     <TextBlock FontSize="14" Foreground="#FFEFEFEF"
-                               Text="{Binding NaturalDuration, StringFormat=hh\\:mm\\:ss, ElementName=mediaElement, Converter={StaticResource DurationToTimeSpanConverter}}" />
+                               Text="{Binding NaturalDuration, StringFormat=hh\\:mm\\:ss, ElementName=mediaElement, Converter={StaticResource DurationToTimeSpanConverter}}"
+                               Visibility="{Binding NaturalDuration.HasTimeSpan, ElementName=mediaElement, Converter={StaticResource BooleanToVisibilityVisibleConverter}}" />
                 </StackPanel>
             </Grid>
         </Grid>
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
index bd31b87..c086dbe 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
@@ -46,8 +46,8 @@ namespace QuickLook.Plugin.VideoViewer
             //};
             buttonMute.MouseLeftButtonUp += (sender, e) => mediaElement.IsMuted = !mediaElement.IsMuted;
             buttonStop.MouseLeftButtonUp += (sender, e) => mediaElement.Stop();
-            buttonBackward.MouseLeftButtonUp += (sender, e) => SeekBackward();
-            buttonForward.MouseLeftButtonUp += (sender, e) => SeekForward();
+            buttonBackward.MouseLeftButtonUp += (sender, e) => Seek(TimeSpan.FromSeconds(-10));
+            buttonForward.MouseLeftButtonUp += (sender, e) => Seek(TimeSpan.FromSeconds(10));
 
             sliderProgress.PreviewMouseDown += (sender, e) =>
             {
@@ -60,52 +60,44 @@ namespace QuickLook.Plugin.VideoViewer
             };
 
             mediaElement.MediaFailed += ShowErrorNotification;
-            mediaElement.MediaEnded += (s, e) =>
+            /*mediaElement.MediaEnded += (s, e) =>
             {
-                if (!mediaElement.NaturalDuration.HasTimeSpan)
-                {
-                    mediaElement.Stop();
-                    mediaElement.Play();
-                }
-            };
+                if (mediaElement.IsOpen)
+                    if (!mediaElement.NaturalDuration.HasTimeSpan)
+                    {
+                        mediaElement.Stop();
+                        mediaElement.Play();
+                    }
+            };*/
+
+            PreviewMouseWheel += (sender, e) => ChangeVolume((double) e.Delta / 120 / 50);
         }
 
         public void Dispose()
         {
-            mediaElement?.Stop();
-            mediaElement?.Dispose();
+            try
+            {
+                mediaElement?.Stop();
+                mediaElement?.Dispose();
+            }
+            catch (Exception e)
+            {
+                Debug.WriteLine(e);
+            }
             mediaElement = null;
-            Debug.WriteLine("dispose done");
         }
 
-        private void ResumePlaying()
+        private void ChangeVolume(double delta)
         {
-            _wasPlaying = mediaElement.IsPlaying;
+            mediaElement.Volume += delta;
         }
 
-        private void SeekBackward()
+        private void Seek(TimeSpan delta)
         {
             _wasPlaying = mediaElement.IsPlaying;
             mediaElement.Pause();
 
-            var pos = mediaElement.Position;
-            var delta = TimeSpan.FromSeconds(15);
-
-            mediaElement.Position = pos < pos - delta ? TimeSpan.Zero : pos - delta;
-
-            if (_wasPlaying) mediaElement.Play();
-        }
-
-        private void SeekForward()
-        {
-            _wasPlaying = mediaElement.IsPlaying;
-            mediaElement.Pause();
-
-            var pos = mediaElement.Position;
-            var len = mediaElement.NaturalDuration.TimeSpan;
-            var delta = TimeSpan.FromSeconds(15);
-
-            mediaElement.Position = pos + delta > len ? len : pos + delta;
+            mediaElement.Position = mediaElement.Position + delta;
 
             if (_wasPlaying) mediaElement.Play();
         }
@@ -113,9 +105,15 @@ namespace QuickLook.Plugin.VideoViewer
         private void TogglePlayPause(object sender, MouseButtonEventArgs e)
         {
             if (mediaElement.IsPlaying)
+            {
                 mediaElement.Pause();
+            }
             else
+            {
+                if (mediaElement.HasMediaEnded)
+                    mediaElement.Stop();
                 mediaElement.Play();
+            }
         }
 
         [DebuggerNonUserCode]
@@ -133,7 +131,7 @@ namespace QuickLook.Plugin.VideoViewer
         public void LoadAndPlay(string path)
         {
             mediaElement.Source = new Uri(path);
-            mediaElement.MediaOpened += (sender, e) => mediaElement.IsMuted = true;
+            mediaElement.MediaOpened += (sender, e) => mediaElement.Volume = 0.2;
         }
 
         ~ViewerPanel()
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.dll b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.dll
index 56aac74..fe15412 100644
Binary files a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.dll and b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.dll differ
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.pdb b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.pdb
new file mode 100644
index 0000000..24179dd
Binary files /dev/null and b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffme.pdb differ
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.dll b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.dll
index d849110..9216e7d 100644
Binary files a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.dll and b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.dll differ
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.pdb b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.pdb
new file mode 100644
index 0000000..14c44d7
Binary files /dev/null and b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ffme/ffmpeg.pdb differ