增加跳转FFmpeg下载页面菜单命令

SpineViewer/Resources/Strings/en.xaml

@@ -6,6 +6,7 @@
     <s:String x:Key="Str_Tool">Tools</s:String>
     <s:String x:Key="Str_Download">Download</s:String>
     <s:String x:Key="Str_Help">Help</s:String>
+    <s:String x:Key="Str_DownloadFFmpeg">Go to download FFmpeg</s:String>
     <s:String x:Key="Str_Diagnostics">Diagnostics Info</s:String>
     <s:String x:Key="Str_Abount">About</s:String>
     <s:String x:Key="Str_Experiment">Experimental Features</s:String>

SpineViewer/Resources/Strings/ja.xaml

@@ -6,6 +6,7 @@
     <s:String x:Key="Str_Tool">ツール</s:String>
     <s:String x:Key="Str_Download">ダウンロード</s:String>
     <s:String x:Key="Str_Help">ヘルプ</s:String>
+    <s:String x:Key="Str_DownloadFFmpeg">FFmpeg をダウンロードしに行く</s:String>
     <s:String x:Key="Str_Diagnostics">診断情報</s:String>
     <s:String x:Key="Str_Abount">バージョン情報</s:String>
     <s:String x:Key="Str_Experiment">実験機能</s:String>

SpineViewer/Resources/Strings/zh.xaml

@@ -6,6 +6,7 @@
     <s:String x:Key="Str_Tool">工具</s:String>
     <s:String x:Key="Str_Download">下载</s:String>
     <s:String x:Key="Str_Help">帮助</s:String>
+    <s:String x:Key="Str_DownloadFFmpeg">前往下载 FFmpeg</s:String>
     <s:String x:Key="Str_Diagnostics">诊断信息</s:String>
     <s:String x:Key="Str_Abount">关于</s:String>
     <s:String x:Key="Str_Experiment">实验性功能</s:String>

SpineViewer/ViewModels/MainWindow/MainWindowViewModel.cs

@@ -5,6 +5,7 @@ using SFMLRenderer;
 using SpineViewer.Models;
 using SpineViewer.Services;
 using SpineViewer.Utils;
+using System.Diagnostics;
 using System.Windows;
 using System.Windows.Shell;
 
@@ -163,6 +164,12 @@ namespace SpineViewer.ViewModels.MainWindow
             JsonHelper.Serialize(Workspace, fileName);
         }
 
+        /// <summary>
+        /// 打开 FFmpeg 下载页面
+        /// </summary>
+        public RelayCommand Cmd_DownloadFFmpeg => _cmd_DownloadFFmpeg ??= new(() => Process.Start(new ProcessStartInfo("https://ffmpeg.org/download.html") { UseShellExecute = true }));
+        private RelayCommand? _cmd_DownloadFFmpeg;
+
         /// <summary>
         /// 显示诊断信息对话框
         /// </summary>

SpineViewer/Views/MainWindow.xaml

@@ -62,8 +62,8 @@
                     <!--<MenuItem Header="{DynamicResource Str_Tool}"/>-->
                     <!--<MenuItem Header="{DynamicResource Str_Download}"/>-->
                     <MenuItem Header="{DynamicResource Str_Help}">
+                        <MenuItem Header="{DynamicResource Str_DownloadFFmpeg}" Command="{Binding Cmd_DownloadFFmpeg}"/>
                         <MenuItem Header="{DynamicResource Str_Diagnostics}" Command="{Binding Cmd_ShowDiagnosticsDialog}"/>
-                        <Separator/>
                         <MenuItem Header="{DynamicResource Str_Abount}" Command="{Binding Cmd_ShowAboutDialog}"/>
                         <MenuItem Header="{DynamicResource Str_Debug}" Click="DebugMenuItem_Click" Visibility="{Binding IsDebug, Mode=OneWay, Converter={StaticResource Boolean2VisibilityConverter}}"/>
                     </MenuItem>