增加导出速度设置

SpineViewer/ViewModels/Exporters/CustomFFmpegExporterViewModel.cs

@@ -64,6 +64,7 @@ namespace SpineViewer.ViewModels.Exporters
             {
                 BackgroundColor = new(_backgroundColor.R, _backgroundColor.G, _backgroundColor.B, _backgroundColor.A),
                 Fps = _fps,
+                Speed = _speed,
                 KeepLast = _keepLast,
                 Format = _format,
                 Codec = _codec,

SpineViewer/ViewModels/Exporters/FFmpegVideoExporterViewModel.cs

@@ -54,6 +54,7 @@ namespace SpineViewer.ViewModels.Exporters
             {
                 BackgroundColor = new(_backgroundColor.R, _backgroundColor.G, _backgroundColor.B, _backgroundColor.A),
                 Fps = _fps,
+                Speed = _speed,
                 KeepLast = _keepLast,
                 Format = _format,
                 Loop = _loop,

SpineViewer/ViewModels/Exporters/FrameSequenceExporterViewModel.cs

@@ -34,6 +34,7 @@ namespace SpineViewer.ViewModels.Exporters
             {
                 BackgroundColor = new(_backgroundColor.R, _backgroundColor.G, _backgroundColor.B, _backgroundColor.A),
                 Fps = _fps,
+                Speed = _speed,
                 KeepLast = _keepLast
             };
 

SpineViewer/ViewModels/Exporters/VideoExporterViewModel.cs

@@ -16,6 +16,9 @@ namespace SpineViewer.ViewModels.Exporters
         public uint Fps { get => _fps; set => SetProperty(ref _fps, Math.Max(1, value)); }
         protected uint _fps = 30;
 
+        public float  Speed { get => _speed; set => SetProperty(ref _speed, Math.Clamp(value, 0.001f, 1000f)); }
+        protected float _speed = 1f;
+
         public bool KeepLast { get => _keepLast; set => SetProperty(ref _keepLast, value); }
         protected bool _keepLast = true;
     }