diff --git a/Spine/Exporters/FFmpegVideoExporter.cs b/Spine/Exporters/FFmpegVideoExporter.cs
index 744b899..cce74c7 100644
--- a/Spine/Exporters/FFmpegVideoExporter.cs
+++ b/Spine/Exporters/FFmpegVideoExporter.cs
@@ -51,6 +51,12 @@ namespace Spine.Exporters
         public int Quality { get => _quality; set => _quality = Math.Clamp(value, 0, 100); }
         private int _quality = 75;
 
+        /// <summary>
+        /// 无损压缩 (Webp)
+        /// </summary>
+        public bool Lossless { get => _lossless; set => _lossless = value; }
+        private bool _lossless = false;
+
         /// <summary>
         /// CRF
         /// </summary>
@@ -62,7 +68,8 @@ namespace Spine.Exporters
         /// </summary>
         protected override SFMLImageVideoFrame GetFrame(SpineObject[] spines)
         {
-            // BUG: 不知道为什么用 FFmpeg 必须临时创建 RenderTexture, 否则无法正常渲染
+            // BUG: 也许和 SFML 多线程或者 FFmpeg 调用有关, 当渲染线程也在运行的时候此处并行渲染会导致和 SFML 有关的内容都卡死
+            // 不知道为什么用 FFmpeg 必须临时创建 RenderTexture, 否则无法正常渲染, 会导致画面帧丢失
             using var tex = new RenderTexture(_renderTexture.Size.X, _renderTexture.Size.Y);
             using var view = _renderTexture.GetView();
             tex.SetView(view);
@@ -112,7 +119,7 @@ namespace Spine.Exporters
 
         private void SetWebpOptions(FFMpegArgumentOptions options)
         {
-            var customArgs = $"-vf unpremultiply=inplace=1 -quality {_quality} -loop {(_loop ? 0 : 1)}";
+            var customArgs = $"-vf unpremultiply=inplace=1 -quality {_quality} -loop {(_loop ? 0 : 1)} -lossless {(_lossless ? 1 : 0)}";
             options.ForceFormat("webp").WithVideoCodec("libwebp_anim").ForcePixelFormat("yuva420p")
                 .WithCustomArgument(customArgs);
         }
diff --git a/SpineViewer/Resources/Strings/en.xaml b/SpineViewer/Resources/Strings/en.xaml
index cadde50..34e67ef 100644
--- a/SpineViewer/Resources/Strings/en.xaml
+++ b/SpineViewer/Resources/Strings/en.xaml
@@ -174,6 +174,8 @@
     <s:String x:Key="Str_LoopPlayTooltip">Loop animation; only effective for GIF/WebP formats</s:String>
     <s:String x:Key="Str_QualityParameter">Quality Parameter</s:String>
     <s:String x:Key="Str_QualityParameterTooltip">Range 0–100; higher is better; only for WebP format</s:String>
+    <s:String x:Key="Str_LosslessParam">Lossless Compression</s:String>
+    <s:String x:Key="Str_LosslessParamTooltip">Lossless compression. Ignores the quality parameter and only applies to WebP format.</s:String>
     <s:String x:Key="Str_CrfParameter">CRF Parameter</s:String>
     <s:String x:Key="Str_CrfParameterTooltip">Range 0–63; lower is higher quality; only for MP4/WebM/MKV formats</s:String>
 
diff --git a/SpineViewer/Resources/Strings/ja.xaml b/SpineViewer/Resources/Strings/ja.xaml
index 83a119a..f3c1b3d 100644
--- a/SpineViewer/Resources/Strings/ja.xaml
+++ b/SpineViewer/Resources/Strings/ja.xaml
@@ -174,6 +174,8 @@
     <s:String x:Key="Str_LoopPlayTooltip">アニメーションをループ再生するか。Gif/Webp形式のみ有効です</s:String>
     <s:String x:Key="Str_QualityParameter">品質パラメーター</s:String>
     <s:String x:Key="Str_QualityParameterTooltip">品質パラメーター。値の範囲は0-100。数値が大きいほど品質が高くなります。Webp形式のみ有効です</s:String>
+    <s:String x:Key="Str_LosslessParam">可逆圧縮</s:String>
+    <s:String x:Key="Str_LosslessParamTooltip">可逆圧縮を行います。品質パラメータは無視され、WebP形式にのみ適用されます。</s:String>
     <s:String x:Key="Str_CrfParameter">CRFパラメーター</s:String>
     <s:String x:Key="Str_CrfParameterTooltip">CRFパラメーター。値の範囲は0-63。数値が小さいほど品質が高くなります。Mp4/Webm/Mkv形式のみ有効です</s:String>
 
diff --git a/SpineViewer/Resources/Strings/zh.xaml b/SpineViewer/Resources/Strings/zh.xaml
index 983b8e4..53c90de 100644
--- a/SpineViewer/Resources/Strings/zh.xaml
+++ b/SpineViewer/Resources/Strings/zh.xaml
@@ -173,7 +173,9 @@
     <s:String x:Key="Str_LoopPlay">循环播放</s:String>
     <s:String x:Key="Str_LoopPlayTooltip">动图是否循环播放，仅对 Gif/Webp 格式生效</s:String>
     <s:String x:Key="Str_QualityParameter">质量参数</s:String>
-    <s:String x:Key="Str_QualityParameterTooltip">质量参数，取值范围 0-100，越高质量越好 仅对 Webp 格式生效</s:String>
+    <s:String x:Key="Str_QualityParameterTooltip">质量参数，取值范围 0-100，越高质量越好, 仅对 Webp 格式生效</s:String>
+    <s:String x:Key="Str_LosslessParam">无损压缩</s:String>
+    <s:String x:Key="Str_LosslessParamTooltip">无损压缩, 会忽略质量参数, 仅对 Webp 格式生效</s:String>
     <s:String x:Key="Str_CrfParameter">CRF 参数</s:String>
     <s:String x:Key="Str_CrfParameterTooltip">CRF 参数，取值范围 0-63，越小质量越高，仅对 Mp4/Webm/Mkv 格式生效</s:String>
 
diff --git a/SpineViewer/ViewModels/Exporters/FFmpegVideoExporterViewModel.cs b/SpineViewer/ViewModels/Exporters/FFmpegVideoExporterViewModel.cs
index 779c134..37471ff 100644
--- a/SpineViewer/ViewModels/Exporters/FFmpegVideoExporterViewModel.cs
+++ b/SpineViewer/ViewModels/Exporters/FFmpegVideoExporterViewModel.cs
@@ -29,6 +29,9 @@ namespace SpineViewer.ViewModels.Exporters
         public int Quality { get => _quality; set => SetProperty(ref _quality, Math.Clamp(value, 0, 100)); }
         protected int _quality = 75;
 
+        public bool Lossless { get => _lossless; set => SetProperty(ref _lossless, value); }
+        protected bool _lossless = false;
+
         public int Crf { get => _crf; set => SetProperty(ref _crf, Math.Clamp(value, 0, 63)); }
         protected int _crf = 23;
 
@@ -55,6 +58,7 @@ namespace SpineViewer.ViewModels.Exporters
                 Format = _format,
                 Loop = _loop,
                 Quality = _quality,
+                Lossless = _lossless,
                 Crf = _crf
             };
 
diff --git a/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml b/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
index 4882b27..394d3a1 100644
--- a/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
+++ b/SpineViewer/Views/ExporterDialogs/FFmpegVideoExporterDialog.xaml
@@ -9,7 +9,7 @@
         mc:Ignorable="d"
         Title="{DynamicResource Str_FFmpegVideoExporterTitle}"
         Width="450"
-        Height="550"
+        Height="580"
         ShowInTaskbar="False"
         WindowStartupLocation="CenterOwner">
     <DockPanel>
@@ -66,6 +66,7 @@
                         <RowDefinition Height="Auto"/>
                         <RowDefinition Height="Auto"/>
                         <RowDefinition Height="Auto"/>
+                        <RowDefinition Height="Auto"/>
                     </Grid.RowDefinitions>
 
                     <!-- 水平分辨率 -->
@@ -138,9 +139,13 @@
                     <Label Grid.Row="15" Grid.Column="0" Content="{DynamicResource Str_QualityParameter}" ToolTip="{DynamicResource Str_QualityParameterTooltip}"/>
                     <TextBox Grid.Row="15" Grid.Column="1" Text="{Binding Quality}" ToolTip="{DynamicResource Str_QualityParameterTooltip}"/>
 
+                    <!-- 无损压缩 -->
+                    <Label Grid.Row="16" Grid.Column="0" Content="{DynamicResource Str_LosslessParam}" ToolTip="{DynamicResource Str_LosslessParamTooltip}"/>
+                    <ToggleButton Grid.Row="16" Grid.Column="1" IsChecked="{Binding Lossless}" ToolTip="{DynamicResource Str_LosslessParamTooltip}"/>
+
                     <!-- CRF 参数 -->
-                    <Label Grid.Row="16" Grid.Column="0" Content="{DynamicResource Str_CrfParameter}" ToolTip="{DynamicResource Str_CrfParameterTooltip}"/>
-                    <TextBox Grid.Row="16" Grid.Column="1" Text="{Binding Crf}" ToolTip="{DynamicResource Str_CrfParameterTooltip}"/>
+                    <Label Grid.Row="17" Grid.Column="0" Content="{DynamicResource Str_CrfParameter}" ToolTip="{DynamicResource Str_CrfParameterTooltip}"/>
+                    <TextBox Grid.Row="17" Grid.Column="1" Text="{Binding Crf}" ToolTip="{DynamicResource Str_CrfParameterTooltip}"/>
                 </Grid>
             </ScrollViewer>