修复: 统一滚动测试版名称

Emby.MeiamSub.Assrt/Emby.MeiamSub.Assrt.csproj

@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <AssemblyVersion>1.0.17.0</AssemblyVersion>
-    <FileVersion>1.0.17.0</FileVersion>
-    <Version>1.0.17.0</Version>
+    <AssemblyVersion>1.0.17.1</AssemblyVersion>
+    <FileVersion>1.0.17.1</FileVersion>
+    <Version>1.0.17.1</Version>
   </PropertyGroup>
 
   <PropertyGroup>

Emby.MeiamSub.Thunder/Emby.MeiamSub.Thunder.csproj

@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <AssemblyVersion>1.0.17.0</AssemblyVersion>
-    <FileVersion>1.0.17.0</FileVersion>
-    <Version>1.0.17.0</Version>
+    <AssemblyVersion>1.0.17.1</AssemblyVersion>
+    <FileVersion>1.0.17.1</FileVersion>
+    <Version>1.0.17.1</Version>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -27,6 +27,7 @@
     <!-- 使用旧版宿主可解析的 SDK，避免插件要求 4.9.1.90 程序集。 -->
     <PackageReference Include="MediaBrowser.Common" Version="4.8.10" />
     <PackageReference Include="MediaBrowser.Server.Core" Version="4.8.10" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
   </ItemGroup>
 
   

Emby.MeiamSub.Thunder/ThunderProvider.cs

@@ -286,14 +286,14 @@ namespace Emby.MeiamSub.Thunder
                     await response.Content.CopyToAsync(stream, 81920, cancellationToken);
                     var data = stream.ToArray();
                     stream.Dispose();
-                    SubtitleContentValidator.Validate(data, format, response.ContentType);
+                    var utf8Data = SubtitleContentValidator.ValidateAndConvertToUtf8(data, format, response.ContentType);
 
                     return new SubtitleResponse()
                     {
                         Language = downloadSub.Language,
                         IsForced = downloadSub.IsForced ?? false,
                         Format = format,
-                        Stream = new MemoryStream(data, writable: false),
+                        Stream = new MemoryStream(utf8Data, writable: false),
                     };
                 }
             }

Jellyfin.MeiamSub.Assrt/Jellyfin.MeiamSub.Assrt.csproj

@@ -3,9 +3,9 @@
   <PropertyGroup>
     <OutputType>Library</OutputType>
     <TargetFramework>net8.0</TargetFramework>
-    <Version>1.0.17.0</Version>
-    <AssemblyVersion>1.0.17.0</AssemblyVersion>
-    <FileVersion>1.0.17.0</FileVersion>
+    <Version>1.0.17.1</Version>
+    <AssemblyVersion>1.0.17.1</AssemblyVersion>
+    <FileVersion>1.0.17.1</FileVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">

Jellyfin.MeiamSub.Assrt/meta.json

@@ -5,8 +5,8 @@
   "name": "MeiamSub.Assrt",
   "owner": "Meiam",
   "targetAbi": "10.10.7.0",
-  "timestamp": "2026-09-16T08:13:02.0000000Z",
-  "version": "1.0.17.0",
+  "timestamp": "2026-09-17T03:17:33.0000000Z",
+  "version": "1.0.17.1",
   "status": "Active",
   "imagePath": "thumb.png"
 }

Jellyfin.MeiamSub.Thunder/Jellyfin.MeiamSub.Thunder.csproj

@@ -3,8 +3,8 @@
   <PropertyGroup>
     <OutputType>Library</OutputType>
     <TargetFramework>net8.0</TargetFramework>
-    <Version>1.0.17.0</Version>
-    <AssemblyVersion>1.0.17.0</AssemblyVersion>
+    <Version>1.0.17.1</Version>
+    <AssemblyVersion>1.0.17.1</AssemblyVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
@@ -14,6 +14,7 @@
   <ItemGroup>
     <!-- 使用已验证的最低兼容基线，保持同一 DLL 可运行于 Jellyfin 10.10.7、10.11.11 和 12.1。 -->
     <PackageReference Include="Jellyfin.Controller" Version="10.10.7" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>

Jellyfin.MeiamSub.Thunder/ThunderProvider.cs

@@ -283,8 +283,11 @@ namespace Jellyfin.MeiamSub.Thunder
                     var format = NormalizeFormat(downloadSub.Format)
                         ?? throw new InvalidDataException($"Unsupported subtitle format: {downloadSub.Format}");
                     var data = await response.Content.ReadAsByteArrayAsync(cancellationToken);
-                    SubtitleContentValidator.Validate(data, format, response.Content.Headers.ContentType?.MediaType);
-                    var stream = new MemoryStream(data, writable: false);
+                    var utf8Data = SubtitleContentValidator.ValidateAndConvertToUtf8(
+                        data,
+                        format,
+                        response.Content.Headers.ContentType?.MediaType);
+                    var stream = new MemoryStream(utf8Data, writable: false);
 
                     return new SubtitleResponse()
                     {

Jellyfin.MeiamSub.Thunder/meta.json

@@ -5,8 +5,8 @@
   "name": "MeiamSub.Thunder",
   "owner": "Meiam",
   "targetAbi": "10.10.7.0",
-  "timestamp": "2026-09-16T08:13:02.0000000Z",
-  "version": "1.0.17.0",
+  "timestamp": "2026-09-17T03:17:33.0000000Z",
+  "version": "1.0.17.1",
   "status": "Active",
   "imagePath": "thumb.png"
 }

README.md

@@ -4,7 +4,7 @@
 
 <p align="left">
   <a href="https://github.com/91270/MeiamSubtitles/releases/latest"><img src="https://img.shields.io/github/v/release/91270/MeiamSubtitles" alt="Release"></a>
-  <img src="https://img.shields.io/badge/.NET-Standard%202.1%20%7C%209.0-blueviolet.svg" alt=".NET Status">
+  <img src="https://img.shields.io/badge/.NET-Standard%202.1%20%7C%208.0-blueviolet.svg" alt=".NET Status">
   <a href="#插件与兼容性"><img src="https://img.shields.io/badge/Platform-Linux%20%7C%20Windows%20%7C%20macOS-brightgreen.svg" alt="Platform"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache%202.0-blue.svg" alt="License"></a>
   <a href="https://www.592.la/"><img src="https://img.shields.io/badge/博客-Meiam's%20Home-brightgreen.svg" alt="博客"></a>
@@ -51,6 +51,15 @@
 | Emby | 4.8.10.0 至 4.10.0.40 |
 | Jellyfin | 10.10.7 至 12.1 |
 
+## 版本渠道
+
+- **正式版**：版本号末位为 `0`，例如 `1.0.18.0`。正式版会发布到 GitHub Releases，并同步到 Jellyfin 稳定插件仓库。
+- **测试版（Preview）**：GitHub 只保留一个滚动更新的“测试版（滚动更新）”，固定使用 `preview` 标签和 `Emby_preview.zip`、`Jellyfin_preview.zip` 两个附件。GitHub 中仍标记为 Pre-release，以区别于稳定发布。
+- 每次更新测试版时，插件内部版本末位继续递增，例如 `1.0.17.1`、`1.0.17.2`，用于识别用户实际安装的测试批次；旧测试包会被新包替换。
+- 测试版不会写入稳定插件仓库，测试用户需要从 GitHub 的 `preview` Release 手动下载安装。
+- 正式版版本号必须高于同一轮全部测试版。例如 `1.0.17.1`、`1.0.17.2` 验证完成后发布 `1.0.18.0`。
+- 正式版发布后，滚动测试 Release 会转为草稿保留；开始下一轮测试时再更新并重新公开。
+
 ## 安装
 
 ### Jellyfin 存储库

Shared/SubtitleContentValidator.cs

@@ -7,7 +7,27 @@ namespace MeiamSubtitles.Shared
 {
     internal static class SubtitleContentValidator
     {
+        private static readonly Encoding StrictUtf8 = new UTF8Encoding(false, true);
+        private static readonly Encoding StrictUtf16Le = new UnicodeEncoding(false, true, true);
+        private static readonly Encoding StrictUtf16Be = new UnicodeEncoding(true, true, true);
+
+        static SubtitleContentValidator()
+        {
+            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+        }
+
         public static void Validate(byte[] data, string format, string mediaType)
+        {
+            DecodeAndValidate(data, format, mediaType);
+        }
+
+        public static byte[] ValidateAndConvertToUtf8(byte[] data, string format, string mediaType)
+        {
+            var text = DecodeAndValidate(data, format, mediaType);
+            return Encoding.UTF8.GetBytes(text);
+        }
+
+        private static string DecodeAndValidate(byte[] data, string format, string mediaType)
         {
             if (data == null || data.Length < 8)
             {
@@ -38,7 +58,7 @@ namespace MeiamSubtitles.Shared
 
                 if (IsValidSubtitle(sample, format))
                 {
-                    return;
+                    return sample;
                 }
 
                 if (sample.StartsWith("[", StringComparison.Ordinal))
@@ -65,35 +85,52 @@ namespace MeiamSubtitles.Shared
 
         private static IEnumerable<string> DecodeSamples(byte[] data)
         {
-            var length = Math.Min(data.Length, 4096);
+            // Decode the complete subtitle because the selected text is returned to
+            // the host after validation and must not be truncated to a probe window.
+            var length = data.Length;
 
             if (data.Length >= 2)
             {
                 if (data[0] == 0xFF && data[1] == 0xFE)
                 {
-                    yield return DecodeSample(data, length, Encoding.Unicode);
+                    yield return DecodeSample(data, length, StrictUtf16Le);
                     yield break;
                 }
 
                 if (data[0] == 0xFE && data[1] == 0xFF)
                 {
-                    yield return DecodeSample(data, length, Encoding.BigEndianUnicode);
+                    yield return DecodeSample(data, length, StrictUtf16Be);
                     yield break;
                 }
             }
 
             if (data.Length >= 3 && data[0] == 0xEF && data[1] == 0xBB && data[2] == 0xBF)
             {
-                yield return DecodeSample(data, length, Encoding.UTF8);
+                yield return DecodeSample(data, length, StrictUtf8);
                 yield break;
             }
 
-            // Thunder may return UTF-16 subtitles without a BOM. Try the common
-            // single-byte/UTF-8 representation and both UTF-16 byte orders, then
-            // accept only a candidate that contains the expected subtitle syntax.
-            yield return DecodeSample(data, length, new UTF8Encoding(false, false));
-            yield return DecodeSample(data, length, Encoding.Unicode);
-            yield return DecodeSample(data, length, Encoding.BigEndianUnicode);
+            // Thunder may return UTF-16 or GB18030 subtitles without a BOM. Decode
+            // strictly so invalid UTF-8 cannot hide the actual legacy encoding.
+            foreach (var encoding in new[] { StrictUtf8, StrictUtf16Le, StrictUtf16Be, GetGb18030Encoding() })
+            {
+                string sample;
+                try
+                {
+                    sample = DecodeSample(data, length, encoding);
+                }
+                catch (DecoderFallbackException)
+                {
+                    continue;
+                }
+
+                yield return sample;
+            }
+        }
+
+        private static Encoding GetGb18030Encoding()
+        {
+            return Encoding.GetEncoding(54936, EncoderFallback.ExceptionFallback, DecoderFallback.ExceptionFallback);
         }
 
         private static string DecodeSample(byte[] data, int length, Encoding encoding)

publish.ps1

@@ -1,6 +1,10 @@
 param (
     [Parameter(Mandatory=$true)]
     [string]$Version,
+
+    [Parameter(Mandatory=$false)]
+    [ValidateSet("Stable", "Preview")]
+    [string]$Channel = "Stable",
     
     [Parameter(Mandatory=$false)]
     [string]$JellyfinVersion,
@@ -12,18 +16,18 @@ param (
     [string]$Notes,
     
     [Parameter(Mandatory=$false)]
-    [switch]$PublishToGitHub
+    [switch]$PublishToGitHub,
+
+    [Parameter(Mandatory=$false)]
+    [switch]$ValidateOnly
 )
 
 $ErrorActionPreference = "Stop"
 $SupportedEmbySdkVersion = "4.8.10"
 $SupportedJellyfinSdkVersion = "10.10.7"
-
-Write-Host "=== Start Release Process, Target Version: $Version ===" -ForegroundColor Cyan
-
-# 1. Get current UTC timestamp
-$Timestamp = [DateTime]::UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.0000000Z")
-Write-Host "Current package timestamp (UTC): $Timestamp" -ForegroundColor Gray
+$RepositoryRoot = (Resolve-Path $PSScriptRoot).Path.Replace('\', '/')
+$GitArguments = @("-c", "safe.directory=$RepositoryRoot")
+$PreviewTag = "preview"
 
 # Define paths
 $ThunderCsproj = "Jellyfin.MeiamSub.Thunder\Jellyfin.MeiamSub.Thunder.csproj"
@@ -33,6 +37,75 @@ $AssrtMeta = "Jellyfin.MeiamSub.Assrt\meta.json"
 $EmbyThunderCsproj = "Emby.MeiamSub.Thunder\Emby.MeiamSub.Thunder.csproj"
 $EmbyAssrtCsproj = "Emby.MeiamSub.Assrt\Emby.MeiamSub.Assrt.csproj"
 
+if ($Version -notmatch '^\d+\.\d+\.\d+\.\d+$') {
+    throw "版本号必须使用四段数字格式，例如 1.0.18.0 或 1.0.17.1。"
+}
+
+$VersionParts = $Version.Split('.') | ForEach-Object { [int]$_ }
+$Revision = $VersionParts[3]
+
+if ($Channel -eq "Stable" -and $Revision -ne 0) {
+    throw "正式版版本号末位必须为 0，例如 1.0.18.0。"
+}
+
+if ($Channel -eq "Preview" -and $Revision -eq 0) {
+    throw "测试版版本号末位必须大于 0，例如 1.0.17.1。"
+}
+
+if ($Channel -eq "Preview" -and $PublishToGitHub -and [string]::IsNullOrWhiteSpace($Notes)) {
+    throw "发布滚动测试版时必须通过 -Notes 说明本轮测试重点。"
+}
+
+$CurrentVersionMatch = [regex]::Match((Get-Content -LiteralPath $ThunderCsproj -Raw), '<Version>([\d\.]+)</Version>')
+if (-not $CurrentVersionMatch.Success) {
+    throw "无法读取当前插件版本。"
+}
+$CurrentVersion = [version]$CurrentVersionMatch.Groups[1].Value
+if ([version]$Version -le $CurrentVersion) {
+    throw "目标版本 $Version 必须高于当前版本 $CurrentVersion。"
+}
+
+$WorkingTreeChanges = @(git @GitArguments status --porcelain)
+if ($LASTEXITCODE -ne 0) {
+    throw "无法检查 Git 工作树状态。"
+}
+
+if ($WorkingTreeChanges.Count -gt 0) {
+    throw "发布前工作树必须保持干净，请先提交或处理现有变更。"
+}
+
+if ($Channel -eq "Stable") {
+    $ExistingLocalTag = git @GitArguments tag --list "v$Version"
+    if ($LASTEXITCODE -ne 0) {
+        throw "无法检查本地 Git 标签。"
+    }
+    if ($ExistingLocalTag) {
+        throw "本地标签 v$Version 已存在，禁止覆盖已经使用的正式版本。"
+    }
+
+    if ($PublishToGitHub) {
+        git @GitArguments ls-remote --exit-code --tags origin "refs/tags/v$Version" | Out-Null
+        if ($LASTEXITCODE -eq 0) {
+            throw "远端标签 v$Version 已存在，禁止覆盖已经公开的正式版本。"
+        }
+        if ($LASTEXITCODE -ne 2) {
+            throw "无法检查远端标签，请检查网络或 Git 认证。"
+        }
+    }
+}
+
+$ChannelLabel = if ($Channel -eq "Preview") { "测试版发布" } else { "正式发布" }
+Write-Host "=== 开始${ChannelLabel}流程，目标版本：$Version ===" -ForegroundColor Cyan
+
+if ($ValidateOnly) {
+    Write-Host "发布参数、工作树和标签检查通过。" -ForegroundColor Green
+    return
+}
+
+# 1. Get current UTC timestamp
+$Timestamp = [DateTime]::UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.0000000Z")
+Write-Host "Current package timestamp (UTC): $Timestamp" -ForegroundColor Gray
+
 # Update NuGet package version if specified
 if ($JellyfinVersion -and $JellyfinVersion -ne $SupportedJellyfinSdkVersion) {
     throw "Jellyfin SDK must remain at $SupportedJellyfinSdkVersion for the verified 10.10.7-12.1 compatibility range. Update the compatibility matrix before changing it."
@@ -88,6 +161,15 @@ Write-Host "Versions and timestamps updated successfully!" -ForegroundColor Gree
 # 2. Compile solution
 Write-Host "Compiling solution in Release mode..." -ForegroundColor Yellow
 dotnet build MeiamSubtitles.sln -c Release
+if ($LASTEXITCODE -ne 0) {
+    throw "解决方案编译失败。"
+}
+
+Write-Host "Running automated tests..." -ForegroundColor Yellow
+dotnet test tests\MeiamSubtitles.Tests\MeiamSubtitles.Tests.csproj -c Release --no-restore
+if ($LASTEXITCODE -ne 0) {
+    throw "自动测试失败。"
+}
 
 # 3. Create zip archives
 Write-Host "Packaging zip archives..." -ForegroundColor Yellow
@@ -117,9 +199,15 @@ Copy-Item Release\dependencies\Jellyfin\* $JellyfinAssrtPackDir\
 Copy-Item Jellyfin.MeiamSub.Assrt\meta.json $JellyfinAssrtPackDir\
 Copy-Item Jellyfin.MeiamSub.Assrt\thumb.png $JellyfinAssrtPackDir\
 
-# Archive target paths
-$EmbyZip = "Release\Emby_v$Version.zip"
-$JellyfinZip = "Release\Jellyfin_v$Version.zip"
+# Archive target paths. Preview assets use stable names because the single
+# rolling preview release replaces them on every test iteration.
+if ($Channel -eq "Preview") {
+    $EmbyZip = "Release\Emby_preview.zip"
+    $JellyfinZip = "Release\Jellyfin_preview.zip"
+} else {
+    $EmbyZip = "Release\Emby_v$Version.zip"
+    $JellyfinZip = "Release\Jellyfin_v$Version.zip"
+}
 
 if (Test-Path $EmbyZip) { Remove-Item -Force $EmbyZip }
 if (Test-Path $JellyfinZip) { Remove-Item -Force $JellyfinZip }
@@ -140,23 +228,132 @@ if ($PublishToGitHub) {
     Write-Host "=== Start GitHub Release process ===" -ForegroundColor Cyan
     
     Write-Host "Staging and committing release changes..." -ForegroundColor Yellow
-    git add .
-    git commit -m "release: v$Version"
+    $ReleaseMetadataFiles = @(
+        $ThunderCsproj,
+        $ThunderMeta,
+        $AssrtCsproj,
+        $AssrtMeta,
+        $EmbyThunderCsproj,
+        $EmbyAssrtCsproj
+    )
+    git @GitArguments add -- $ReleaseMetadataFiles
+    if ($LASTEXITCODE -ne 0) {
+        throw "暂存发布版本文件失败。"
+    }
+
+    git @GitArguments diff --cached --check
+    if ($LASTEXITCODE -ne 0) {
+        throw "暂存内容存在空白错误。"
+    }
+
+    $CommitMessage = if ($Channel -eq "Preview") {
+        "发布: 更新滚动测试版至 v$Version"
+    } else {
+        "发布: v$Version"
+    }
+    git @GitArguments commit -m $CommitMessage
+    if ($LASTEXITCODE -ne 0) {
+        throw "创建发布提交失败。"
+    }
     
     Write-Host "Pushing changes to remote repository..." -ForegroundColor Yellow
-    git push origin master
+    git @GitArguments push origin master
+    if ($LASTEXITCODE -ne 0) {
+        throw "推送发布提交失败。"
+    }
     
-    Write-Host "Creating GitHub Release v$Version and uploading assets..." -ForegroundColor Yellow
-    if ($Notes) {
-        $AutoNotes = gh release generate-notes --tag "v$Version"
-        $NotesContent = "## Release Notes`n`n$Notes`n`n" + $AutoNotes
-        $NotesFile = "Release\temp_notes.md"
-        Set-Content -Path $NotesFile -Value $NotesContent
-        
-        gh release create "v$Version" $EmbyZip $JellyfinZip --title "v$Version" --notes-file $NotesFile
-        if (Test-Path $NotesFile) { Remove-Item -Force $NotesFile }
+    if ($Channel -eq "Preview") {
+        Write-Host "Updating rolling GitHub test release..." -ForegroundColor Yellow
+        $CommitSha = git @GitArguments rev-parse HEAD
+        if ($LASTEXITCODE -ne 0) {
+            throw "无法读取预发布提交哈希。"
+        }
+
+        $EmbyHash = (Get-FileHash -LiteralPath $EmbyZip -Algorithm SHA256).Hash
+        $JellyfinHash = (Get-FileHash -LiteralPath $JellyfinZip -Algorithm SHA256).Hash
+        $PreviewNotesFile = "Release\preview-notes.md"
+        $PreviewNotes = @"
+## 当前测试版本
+
+- 插件版本：$Version
+- 源码提交：$CommitSha
+- Emby 包 SHA-256：$EmbyHash
+- Jellyfin 包 SHA-256：$JellyfinHash
+
+## 本轮测试重点
+
+$Notes
+
+## 安装说明
+
+停止 Emby 或 Jellyfin，移除旧版 Thunder DLL 或插件目录，再安装本页最新测试包并重启。反馈问题时请注明插件版本和宿主版本。
+"@
+        Set-Content -LiteralPath $PreviewNotesFile -Value $PreviewNotes -Encoding utf8
+
+        try {
+            # The user requested one rolling preview. Only this dedicated tag
+            # may be force-moved; branches and formal release tags remain immutable.
+            git @GitArguments tag --force $PreviewTag $CommitSha
+            if ($LASTEXITCODE -ne 0) {
+                throw "更新本地 preview 标签失败。"
+            }
+            git @GitArguments push origin "refs/tags/$PreviewTag" --force
+            if ($LASTEXITCODE -ne 0) {
+                throw "更新远端 preview 标签失败。"
+            }
+
+            & gh release view $PreviewTag *> $null
+            $PreviewReleaseExists = $LASTEXITCODE -eq 0
+
+            if ($PreviewReleaseExists) {
+                & gh release upload $PreviewTag $EmbyZip $JellyfinZip --clobber
+                if ($LASTEXITCODE -ne 0) {
+                    throw "覆盖滚动测试附件失败；请检查仓库是否启用了 Release 不可变保护。"
+                }
+                & gh release edit $PreviewTag --title "测试版（滚动更新）" --notes-file $PreviewNotesFile --prerelease --draft=false --latest=false
+            } else {
+                & gh release create $PreviewTag $EmbyZip $JellyfinZip --title "测试版（滚动更新）" --verify-tag --notes-file $PreviewNotesFile --prerelease --latest=false
+            }
+
+            if ($LASTEXITCODE -ne 0) {
+                throw "创建或更新滚动测试 Release 失败。"
+            }
+        } finally {
+            if (Test-Path -LiteralPath $PreviewNotesFile) {
+                Remove-Item -LiteralPath $PreviewNotesFile -Force
+            }
+        }
+
+        Write-Host "滚动测试版已更新：不要修改 manifest-stable.json。" -ForegroundColor Yellow
     } else {
-        gh release create "v$Version" $EmbyZip $JellyfinZip --title "v$Version" --generate-notes
+        Write-Host "Creating stable GitHub Release v$Version and uploading assets..." -ForegroundColor Yellow
+        $ReleaseArguments = @(
+            "release", "create", "v$Version",
+            $EmbyZip,
+            $JellyfinZip,
+            "--title", "v$Version",
+            "--target", "master",
+            "--latest"
+        )
+        if ($Notes) {
+            $ReleaseArguments += @("--notes", $Notes, "--generate-notes")
+        } else {
+            $ReleaseArguments += "--generate-notes"
+        }
+        & gh @ReleaseArguments
+        if ($LASTEXITCODE -ne 0) {
+            throw "创建正式 GitHub Release 失败。"
+        }
+
+        & gh release view $PreviewTag *> $null
+        if ($LASTEXITCODE -eq 0) {
+            & gh release edit $PreviewTag --draft
+            if ($LASTEXITCODE -ne 0) {
+                throw "正式版已创建，但隐藏滚动测试 Release 失败。"
+            }
+        }
+
+        Write-Host "正式版 GitHub Release 已创建，请继续更新 MeiamSubtitles.Release 的稳定清单。" -ForegroundColor Yellow
     }
     
     Write-Host "=== GitHub Release finished successfully! ===" -ForegroundColor Green

tests/MeiamSubtitles.Tests/MeiamSubtitles.Tests.csproj

@@ -10,6 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />
   </ItemGroup>

tests/MeiamSubtitles.Tests/SubtitleContentValidatorTests.cs

@@ -32,6 +32,67 @@ public class SubtitleContentValidatorTests
         SubtitleContentValidator.Validate(data, "srt", "application/octet-stream");
     }
 
+    [Fact]
+    public void ConvertsGb18030SrtToUtf8ForPreview()
+    {
+        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+        var content = "1\r\n00:00:01,000 --> 00:00:02,000\r\n中文字幕\r\n";
+        var data = Encoding.GetEncoding(54936).GetBytes(content);
+
+        var normalized = SubtitleContentValidator.ValidateAndConvertToUtf8(
+            data,
+            "srt",
+            "application/octet-stream");
+
+        Assert.Equal(content, Encoding.UTF8.GetString(normalized));
+    }
+
+    [Fact]
+    public void PreservesCompleteUtf8SubtitleWhenNormalizing()
+    {
+        var content = "1\r\n00:00:01,000 --> 00:00:20,000\r\n" + new string('中', 3000) + "\r\n";
+
+        var normalized = SubtitleContentValidator.ValidateAndConvertToUtf8(
+            Encoding.UTF8.GetBytes(content),
+            "srt",
+            "application/octet-stream");
+
+        Assert.Equal(content, Encoding.UTF8.GetString(normalized));
+    }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void ConvertsUtf16SrtToUtf8ForPreview(bool bigEndian)
+    {
+        var encoding = new UnicodeEncoding(bigEndian, true);
+        var content = "1\r\n00:00:01,000 --> 00:00:02,000\r\n中文字幕\r\n";
+        var data = encoding.GetPreamble().Concat(encoding.GetBytes(content)).ToArray();
+
+        var normalized = SubtitleContentValidator.ValidateAndConvertToUtf8(
+            data,
+            "srt",
+            "application/octet-stream");
+
+        Assert.Equal(content, Encoding.UTF8.GetString(normalized));
+    }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void ConvertsUtf16WithoutBomToUtf8ForPreview(bool bigEndian)
+    {
+        var encoding = new UnicodeEncoding(bigEndian, false);
+        var content = "1\r\n00:00:01,000 --> 00:00:02,000\r\n中文字幕\r\n";
+
+        var normalized = SubtitleContentValidator.ValidateAndConvertToUtf8(
+            encoding.GetBytes(content),
+            "srt",
+            "application/octet-stream");
+
+        Assert.Equal(content, Encoding.UTF8.GetString(normalized));
+    }
+
     [Theory]
     [InlineData(false, false)]
     [InlineData(false, true)]