我在这段视频冻结之后应用了一些LinearGradientBrush动画。MediaElement
我尝试通过Player1.OpacityMask = null;但没有快乐来重置它。
顺便说一句，如果我Opacity对当时的视频进行动画处理，MediaElement那么它通常表现得很好。
有什么线索吗？LinearGradientBrush应用动画后如何修复视频冻结MediaElement？
谢谢！
/// <summary>
/// Interaction logic for WipeTransition.xaml
/// </summary>
public partial class WipeTransition
{
public WipeDirections Direction { set; get; }
public TimeSpan Duration = TimeSpan.FromSeconds(2);
public bool StopPrevPlayerOnAnimationStarts;
Random rdm = new Random(1);
bool isPlayer1;
public WipeTransition()
{
InitializeComponent();
try
{
Loaded += WipeTransition_Loaded;
SizeChanged += WipeTransition_SizeChanged;
Player1.CacheMode = new BitmapCache();
Player1.LoadedBehavior = MediaState.Manual;
Player2.CacheMode = new BitmapCache();
Player2.LoadedBehavior = MediaState.Manual;
Direction = WipeDirections.RandomDirection;
Player1.Width = ActualWidth;
Player2.Width = ActualWidth;
Player1.Height = ActualHeight;
Player2.Height = ActualHeight;
isPlayer1 = true;
}
catch (Exception)
{
}
}
void WipeTransition_SizeChanged(object sender, SizeChangedEventArgs e)
{
Player1.Width = ActualWidth;
Player2.Width = ActualWidth;
Player1.Height = ActualHeight;
Player2.Height = ActualHeight;
}
void WipeTransition_Loaded(object sender, RoutedEventArgs e)
{
Player1.Width = ActualWidth;
Player2.Width = ActualWidth;
Player1.Height = ActualHeight;
Player2.Height = ActualHeight;
}
public void Start(Uri uri)
{
try
{
Debug.WriteLine("************** START ANIMATION ***************************************");
Player1.Width = ActualWidth;
Player2.Width = ActualWidth;
Player1.Height = ActualHeight;
Player2.Height = ActualHeight;
// We start to Animate one of the Player is on BACK
if (isPlayer1)
{
if (StopPrevPlayerOnAnimationStarts)
Player2.Stop();
Canvas.SetZIndex(Player2, 49);
Canvas.SetZIndex(Player1, 50);
Player1.Source = uri;
Debug.WriteLine("Player1 - ANIMATE");
WipeAnimation(Player1);
}
else // Player2
{
if (StopPrevPlayerOnAnimationStarts)
Player1.Stop();
Canvas.SetZIndex(Player1, 49);
Canvas.SetZIndex(Player2, 50);
Player2.Source = uri;
Debug.WriteLine("Player2 - ANIMATE");
WipeAnimation(Player2);
}
}
catch (Exception)
{
}
}
public void WipeAnimation(FrameworkElement ObjectToAnimate)
{
try
{
LinearGradientBrush OpacityBrush = new LinearGradientBrush();
#region Setup Wipe Direction
switch (Direction)
{
case WipeDirections.RightToLeft:
OpacityBrush.StartPoint = new Point(1, 0);
OpacityBrush.EndPoint = new Point(0, 0);
break;
case WipeDirections.LeftToRight:
OpacityBrush.StartPoint = new Point(0, 0);
OpacityBrush.EndPoint = new Point(1, 0);
break;
case WipeDirections.BottomToTop:
OpacityBrush.StartPoint = new Point(0, 1);
OpacityBrush.EndPoint = new Point(0, 0);
break;
case WipeDirections.TopToBottom:
OpacityBrush.StartPoint = new Point(0, 0);
OpacityBrush.EndPoint = new Point(0, 1);
break;
case WipeDirections.RandomDirection:
#region
int randomValue = rdm.Next(0, 3);
if (randomValue == 0)
{
OpacityBrush.StartPoint = new Point(1, 0);
OpacityBrush.EndPoint = new Point(0, 0);
}
else if (randomValue == 1)
{
OpacityBrush.StartPoint = new Point(0, 0);
OpacityBrush.EndPoint = new Point(0, 1);
}
else if (randomValue == 2)
{
OpacityBrush.StartPoint = new Point(0, 0);
OpacityBrush.EndPoint = new Point(1, 0);
}
else if (randomValue == 3)
{
OpacityBrush.StartPoint = new Point(0, 1);
OpacityBrush.EndPoint = new Point(0, 0);
}
#endregion
break;
}
#endregion
GradientStop BlackStop = new GradientStop(Colors.Black, 0);
GradientStop TransparentStop = new GradientStop(Colors.Transparent, 0);
if (FindName("TransparentStop") != null)
UnregisterName("TransparentStop");
RegisterName("TransparentStop", TransparentStop);
if (FindName("BlackStop") != null)
UnregisterName("BlackStop");
this.RegisterName("BlackStop", BlackStop);
OpacityBrush.GradientStops.Add(BlackStop);
OpacityBrush.GradientStops.Add(TransparentStop);
ObjectToAnimate.OpacityMask = OpacityBrush;
Storyboard sb = new Storyboard();
DoubleAnimation DA = new DoubleAnimation() { From = 0, To = 1, Duration = Duration };
DoubleAnimation DA2 = new DoubleAnimation() { From = 0, To = 1, Duration = Duration };
sb.Children.Add(DA); sb.Children.Add(DA2);
Storyboard.SetTargetName(DA, "TransparentStop");
Storyboard.SetTargetName(DA2, "BlackStop");
Storyboard.SetTargetProperty(DA, new PropertyPath("Offset"));
Storyboard.SetTargetProperty(DA2, new PropertyPath("Offset"));
sb.Duration = Duration;
sb.Completed += sb_Completed;
sb.Begin(this);
if (isPlayer1)
{
Player1.Play();
}
else // Player2
{
Player2.Play();
}
}
catch (Exception)
{
}
}
void sb_Completed(object sender, EventArgs e)
{
if (isPlayer1)
{
Player1.OpacityMask = null;
isPlayer1 = false;
Player2.Stop();
Player2.Source = null;
}
else // Player2
{
Player2.OpacityMask = null;
isPlayer1 = true;
Player1.Stop();
Player1.Source = null;
}
Debug.WriteLine("************** END ANIMATION ***************************************");
}
public void Stop()
{
if (Player1.IsEnabled)
Player1.Stop();
if (Player2.IsEnabled)
Player2.Stop();
}
}
更新：
应用着色器效果后会发生同样的问题。所以视频在它之前和之后它是跳跃/冻结的。看来我们必须以某种方式重置MedieElement或？
private void Button_Click_1(object sender, RoutedEventArgs e)
{
TransitionEffect[] effectGroup = transitionEffects[1];
TransitionEffect effect = effectGroup[1];
DoubleAnimation da = new DoubleAnimation(0.0, 1.0, new Duration(TimeSpan.FromSeconds(2.0)), FillBehavior.HoldEnd);
da.AccelerationRatio = 0.5;
da.DecelerationRatio = 0.5;
da.Completed += da_Completed;
effect.BeginAnimation(TransitionEffect.ProgressProperty, da);
VisualBrush vb = new VisualBrush(this.Player1);
vb.Viewbox = new Rect(0, 0, this.Player1.ActualWidth, this.Player1.ActualHeight);
vb.ViewboxUnits = BrushMappingMode.Absolute;
effect.OldImage = vb;
this.Player1.Effect = effect;
}