diff --git a/integration_test/windows_mkvend_shot_test.dart b/integration_test/windows_mkvend_shot_test.dart
index 0d5caae..201a962 100644
--- a/integration_test/windows_mkvend_shot_test.dart
+++ b/integration_test/windows_mkvend_shot_test.dart
@@ -72,7 +72,7 @@ void main() {
         late Future<void> building;
         await t.runAsync(() async {
           await c.init();
-          c.settings.maxParallelJobs = 1;
+          c.settings.mkv.maxParallelJobs = 1;
           await c.addVideos(files);
           building = c.buildVideos([...c.videos]);
           for (var i = 0; i < 200 && tool.runs.isEmpty; i++) {
diff --git a/integration_test/windows_mkvportrait_shot_test.dart b/integration_test/windows_mkvportrait_shot_test.dart
index 6f852fc..ebc7ff0 100644
--- a/integration_test/windows_mkvportrait_shot_test.dart
+++ b/integration_test/windows_mkvportrait_shot_test.dart
@@ -46,7 +46,7 @@ void main() {
             createTranslator: () => throw UnimplementedError(),
           ));
           c.settings.display.showLog = true;
-          c.settings.moveTargets = [MoveTarget('보관', p.join(tmp.path, '보관'))];
+          c.settings.mkv.moveTargets = [MoveTarget('보관', p.join(tmp.path, '보관'))];
           for (var i = 1; i <= 4; i++) {
             c.videos.add(VideoItem(p.join(tmp.path, '아주 긴 이름의 동영상 파일 $i.mp4')));
           }
diff --git a/lib/app/app_controller.dart b/lib/app/app_controller.dart
index 069daa4..6c5ca4e 100644
--- a/lib/app/app_controller.dart
+++ b/lib/app/app_controller.dart
@@ -167,7 +167,7 @@ class AppController extends ChangeNotifier {
     SmbRegistry.configure(settings.remote.smbServers);
     FtpRegistry.configure(settings.remote.ftpServers);
     outputRootOverride =
-        (settings.mkvOutputRoot?.isNotEmpty ?? false) ? settings.mkvOutputRoot : null;
+        (settings.mkv.outputRoot?.isNotEmpty ?? false) ? settings.mkv.outputRoot : null;
   }
 
   void _saveSettings() => settingsStore?.save(settings);
@@ -199,14 +199,14 @@ class AppController extends ChangeNotifier {
       try {
         settings.webViewDataDir = p.join((await getApplicationSupportDirectory()).path, 'webview');
       } catch (_) {}
-      encode = settings.encode;
+      encode = settings.mkv.encode;
       aiOptions = AiOptions(
-        source: languageOf(settings.aiSource),
+        source: languageOf(settings.mkv.aiSource),
         targets: {
-          for (final c in settings.aiTargets)
+          for (final c in settings.mkv.aiTargets)
             if (languageOf(c) != undetermined) languageOf(c),
         }.ifEmpty({for (final c in defaultTargetLanguages) languageOf(c)}),
-        whisper: whisperModels.firstWhere((m) => m.id == settings.aiWhisper,
+        whisper: whisperModels.firstWhere((m) => m.id == settings.mkv.aiWhisper,
             orElse: () => whisperModels.first),
       );
       _applySettings();
@@ -284,7 +284,7 @@ class AppController extends ChangeNotifier {
   }
 
   void _encodeChanged() {
-    settings.encode = encode;
+    settings.mkv.encode = encode;
     _saveSettings();
     notifyListeners();
   }
@@ -888,9 +888,9 @@ class AppController extends ChangeNotifier {
     if (!aiAvailable || ffmpegVersion == null || targets.isEmpty) return;
     aiOptions = opts;
     settings
-      ..aiSource = opts.source.code
-      ..aiTargets = [for (final t in opts.targets) t.code]
-      ..aiWhisper = opts.whisper.id;
+      ..mkv.aiSource = opts.source.code
+      ..mkv.aiTargets = [for (final t in opts.targets) t.code]
+      ..mkv.aiWhisper = opts.whisper.id;
     _saveSettings();
     if (busy) {
       for (final v in targets) {
@@ -1391,7 +1391,7 @@ class AppController extends ChangeNotifier {
 
   /// P0: 결과 MKV 가 이미 있을 때 실제로 쓸 동작 ("묻기" 인데 묻지 못한 곳은 예전 것을 지키는 '다른 이름')
   String _existingMode(String? asked) {
-    final m = asked ?? settings.mkvExisting;
+    final m = asked ?? settings.mkv.existing;
     return const ['overwrite', 'skip', 'rename'].contains(m) ? m : 'rename';
   }
 
@@ -1408,7 +1408,7 @@ class AppController extends ChangeNotifier {
       final queue = only?.where(videos.contains).toList() ??
           videos.where((v) => v.status != JobStatus.done).toList();
       if (queue.isEmpty) return;
-      final limit = settings.maxParallelJobs <= 0 ? queue.length : settings.maxParallelJobs;
+      final limit = settings.mkv.maxParallelJobs <= 0 ? queue.length : settings.mkv.maxParallelJobs;
       if (queue.length > 1) _log(trf('MKV 만들기: {0}개, 동시에 {1}개씩', [queue.length, limit.clamp(1, queue.length)]));
       _batchQueue = queue;
       _batchNext = 0;
diff --git a/lib/app/settings.dart b/lib/app/settings.dart
index 2145e23..4e48623 100644
--- a/lib/app/settings.dart
+++ b/lib/app/settings.dart
@@ -4,10 +4,10 @@ import 'package:path/path.dart' as p;
 
 import '../core/reader_sources.dart' show defaultImageExtensions;
 import '../core/download_detect.dart';
-import '../core/encode_options.dart';
 import '../core/playlist.dart';
 import 'settings/records.dart';
 import 'settings/settings_group.dart';
+import 'settings/mkv_settings.dart';
 import 'settings/display_settings.dart';
 import 'settings/remote_settings.dart';
 import 'settings/explorer_tool_settings.dart';
@@ -25,6 +25,7 @@ import 'settings/explorer_settings.dart';
 export 'settings/records.dart';
 export 'settings/settings_group.dart';
 export 'settings/settings_store.dart';
+export 'settings/mkv_settings.dart';
 export 'settings/display_settings.dart';
 export 'settings/remote_settings.dart';
 export 'settings/explorer_tool_settings.dart';
@@ -41,12 +42,7 @@ export 'settings/explorer_settings.dart';
 
 /// 환경 설정 (settings.json 에 저장)
 class AppSettings {
-  /// MKV·자막 저장 위치. null 이면 동영상이 있는 폴더 아래 jj_mkv
-  String? mkvOutputRoot;
 
-  /// MKV 세부 정보 오른쪽 아래의 이동 버튼들 (표시 이름 · 폴더). 세 번 누르기는 첫 번째 버튼의 폴더로.
-  /// 비어 있으면 [이동] 을 처음 누를 때 폴더를 골라 하나 만든다.
-  List<MoveTarget> moveTargets = [];
 
   /// 73: 파일 탐색기 · Rsync 즐겨찾기 (폴더, Rsync 는 짝)
   List<FolderBookmark> folderBookmarks = [];
@@ -59,15 +55,6 @@ class AppSettings {
 
 
 
-  /// AI 자막: 매번 설정 창을 띄울지 (끄면 마지막 설정으로 바로 시작)
-  bool askAiOptions = true;
-
-
-
-  /// OpenSubtitles (인터넷 자막 검색) - 키는 필수, 아이디·비밀번호는 선택 (받기 횟수 늘어남)
-  String openSubtitlesKey = '';
-  String openSubtitlesUser = '';
-  String openSubtitlesPassword = '';
 
 
 
@@ -75,12 +62,11 @@ class AppSettings {
 
 
 
-  /// 동시에 만드는 MKV 수 (0 = 무제한)
-  int maxParallelJobs = 5;
 
 
-  /// 폰 세로 (좁은 화면) MKV 목록 크기: 'auto' 목록은 내용만큼 · 자세히 칸에 최소 높이 (처음 값) · 'small' · 'large' (관리자 판단 10/17)
-  String mkvCompactList = 'auto';
+
+
+
 
 
 
@@ -150,9 +136,6 @@ class AppSettings {
   // ── 복사 · 이동 (파일 탐색기) · rsync · lsync (Rsync 화면) ──
 
 
-  /// P0: MKV 를 만들 때 결과 MKV 가 이미 있으면 - 'ask' 묻기 (처음 값) · 'overwrite' 덮어쓰기 · 'skip' 건너뛰기 · 'rename' 다른 이름.
-  /// 덮어쓰기여도 다 만든 뒤에만 바꿔 넣는다 (도중에 취소 · 실패하면 예전 것 그대로)
-  String mkvExisting = 'ask';
 
 
 
@@ -197,8 +180,6 @@ class AppSettings {
   /// 65 (Windows): 탐색기에서 지우면 휴지통으로 (끄면 늘 영구 삭제로 묻는다)
   bool recycleOnDelete = true;
 
-  /// 47: MKV 목록에서 세 번 누르면 'move' (확인 뒤 이동 폴더로) · 'none' (아무것도 안 함)
-  String tripleTapAction = 'move';
 
   /// 61: 기본 자막 언어 (MKV 의 기본 자막 트랙 · 플레이어가 먼저 켜는 자막). '' = 화면 언어 따르기, 그 밖은 자막 언어 코드 (ko · ja …)
   String preferredSubtitleLanguage = '';
@@ -257,13 +238,7 @@ class AppSettings {
   /// 확장자별 재생 프로그램 (없으면 내장 플레이어): 'system' 또는 실행 파일 경로
   Map<String, String> externalPlayers = {};
 
-  /// 마지막 인코딩 설정
-  EncodeSettings encode = const EncodeSettings();
 
-  /// 마지막 AI 자막 설정
-  String aiSource = 'und';
-  List<String> aiTargets = ['ko', 'en', 'ja'];
-  String aiWhisper = 'whisper-base';
 
   AppSettings();
 
@@ -306,35 +281,21 @@ class AppSettings {
   /// 화면 · 앱 모양 (배율 · 밝기 · 방향 · 언어 · 앱 아이콘 · 컴포넌트 · 화면 순서 · 밀기)
   final display = DisplaySettings();
 
+  /// MKV · 자막 만들기 (저장 위치 · 이동 버튼 · 인코딩 · AI 자막 · OpenSubtitles)
+  final mkv = MkvSettings();
+
   /// 설정 분야들 (설정 A) - 저마다 자기 키를 읽고 쓴다. toJson · fromJson 은 이 목록을 돌며 합치기만 한다
-  List<SettingsGroup> get groups => [explorer, network, tor, copy, aiImage, reader, download, browser, run, vault, tools, remote, display];
+  List<SettingsGroup> get groups => [explorer, network, tor, copy, aiImage, reader, download, browser, run, vault, tools, remote, display, mkv];
 
   /// [plainSecrets]: 안전 저장소를 쓸 수 없을 때만 (예전 파일에 있던 비밀 값을 잃지 않게) 예전처럼 파일에 둔다
   Map<String, Object?> toJson({bool plainSecrets = false}) {
     final j = <String, Object?>{
         // 이 판이 모르는 항목 (새 판이 쓴 것 등) 은 지우지 않고 그대로 (40)
         ...stripSecrets(extra),
-        'mkvOutputRoot': mkvOutputRoot,
-        'moveTargets': [for (final t in moveTargets) t.toJson()],
         'folderBookmarks': [for (final b in folderBookmarks) b.toJson()],
-        'askAiOptions': askAiOptions,
-        // 비밀 값은 안전 저장소에 (54). 파일에는 저장해 두었는지만
-        'openSubtitlesSaved': {
-          'key': openSubtitlesKey.isNotEmpty,
-          'user': openSubtitlesUser.isNotEmpty,
-          'password': openSubtitlesPassword.isNotEmpty,
-        },
-        if (plainSecrets) ...{
-          'openSubtitlesKey': openSubtitlesKey,
-          'openSubtitlesUser': openSubtitlesUser,
-          'openSubtitlesPassword': openSubtitlesPassword,
-        },
         'cookieScopeV2': true,
-        'maxParallelJobs': maxParallelJobs,
-        'mkvCompactList': mkvCompactList,
         'openFileAction': openFileAction,
         'openFileWindow': openFileWindow,
-        'mkvExisting': mkvExisting,
         'robocopyLinksV1': true,
         'imageExts': imageExts,
         'cleanupPrechecked': cleanupPrechecked,
@@ -342,28 +303,12 @@ class AppSettings {
         'allowInnerToOuter': allowInnerToOuter,
         'rememberPasswords': rememberPasswords,
         'recycleOnDelete': recycleOnDelete,
-        'tripleTapAction': tripleTapAction,
         'preferredSubtitleLanguage': preferredSubtitleLanguage,
         // 116: 예전 판의 표시 ('allFilesHintShown') 는 권한이 없어진 것을 몰라 다시 띄우지 못했다 → 새 이름으로 한 번 더
         'allFilesHint2': allFilesHintShown,
         'subtitleScale': subtitleScale,
         'playlistMode': playlistMode.name,
         'externalPlayers': externalPlayers,
-        'encode': {
-          'codec': encode.codec.name,
-          'resolution': encode.resolution.name,
-          'quality': encode.quality.name,
-          'frame': encode.frame.name,
-          'fit': encode.fit.name,
-          'rotate': encode.rotate.name,
-          'brightness': encode.brightness,
-          'contrast': encode.contrast,
-          'saturation': encode.saturation,
-          'temperature': encode.temperature,
-        },
-        'aiSource': aiSource,
-        'aiTargets': aiTargets,
-        'aiWhisper': aiWhisper,
     };
     for (final g in groups) {
       g.write(j, plainSecrets: plainSecrets);
@@ -371,32 +316,13 @@ class AppSettings {
     return j;
   }
 
-
-  /// 색 보정 값 (-100 ~ 100)
-  static int _adj(Object? v) => ((v as num?)?.round() ?? 0).clamp(-100, 100);
-
   factory AppSettings.fromJson(Map<String, dynamic> j) {
     T pick<T extends Enum>(List<T> values, Object? name, T fallback) =>
         values.firstWhere((v) => v.name == name, orElse: () => fallback);
-    final e = (j['encode'] as Map?) ?? const {};
     final s = AppSettings()
-      ..mkvOutputRoot = j['mkvOutputRoot'] as String?
       ..folderBookmarks = [for (final x in (j['folderBookmarks'] as List?) ?? const []) ?FolderBookmark.fromJson(x)]
-      ..moveTargets = [
-        for (final x in (j['moveTargets'] as List?) ?? const [])
-          if (x is Map && x['dir'] is String) MoveTarget.fromJson(x),
-        // 예전 판의 이동 폴더 하나 → "이동" 버튼으로
-        if (j['moveTargets'] == null && j['moveTargetDir'] is String) MoveTarget('이동', j['moveTargetDir'] as String),
-      ]
-      ..askAiOptions = j['askAiOptions'] as bool? ?? true
-      ..openSubtitlesKey = j['openSubtitlesKey'] as String? ?? ''
-      ..openSubtitlesUser = j['openSubtitlesUser'] as String? ?? ''
-      ..openSubtitlesPassword = j['openSubtitlesPassword'] as String? ?? ''
-      ..maxParallelJobs = (j['maxParallelJobs'] as num?)?.toInt() ?? 5
-      ..mkvCompactList = const ['auto', 'small', 'large'].contains(j['mkvCompactList']) ? j['mkvCompactList'] as String : 'auto'
       ..openFileAction = j['openFileAction'] == 'add' ? 'add' : 'play'
       ..openFileWindow = j['openFileWindow'] == 'new' ? 'new' : 'same'
-      ..mkvExisting = const ['rename', 'overwrite', 'skip'].contains(j['mkvExisting']) ? j['mkvExisting'] as String : 'ask'
       ..imageExts = j['imageExts'] is List
           ? [for (final x in j['imageExts'] as List) '$x'.toLowerCase()]
           : [...defaultImageExtensions]
@@ -407,27 +333,11 @@ class AppSettings {
       ..allowInnerToOuter = j['allowInnerToOuter'] != false
       ..rememberPasswords = j['rememberPasswords'] != false
       ..recycleOnDelete = j['recycleOnDelete'] != false
-      ..tripleTapAction = j['tripleTapAction'] == 'none' ? 'none' : 'move'
       ..preferredSubtitleLanguage = j['preferredSubtitleLanguage'] is String ? j['preferredSubtitleLanguage'] as String : ''
       ..allFilesHintShown = j['allFilesHint2'] == true
       ..subtitleScale = ((j['subtitleScale'] as num?)?.toDouble() ?? 1.0).clamp(0.5, 2.5)
       ..playlistMode = pick(PlaylistMode.values, j['playlistMode'], PlaylistMode.series)
-      ..externalPlayers = ((j['externalPlayers'] as Map?) ?? const {}).cast<String, String>()
-      ..encode = EncodeSettings(
-        codec: pick(VideoCodecChoice.values, e['codec'], VideoCodecChoice.copy),
-        resolution: pick(ResolutionChoice.values, e['resolution'], ResolutionChoice.original),
-        quality: pick(QualityChoice.values, e['quality'], QualityChoice.normal),
-        frame: pick(FrameChoice.values, e['frame'], FrameChoice.original),
-        fit: pick(FitChoice.values, e['fit'], FitChoice.fill),
-        rotate: pick(RotateChoice.values, e['rotate'], RotateChoice.none),
-        brightness: _adj(e['brightness']),
-        contrast: _adj(e['contrast']),
-        saturation: _adj(e['saturation']),
-        temperature: _adj(e['temperature']),
-      )
-      ..aiSource = j['aiSource'] as String? ?? 'und'
-      ..aiTargets = (j['aiTargets'] as List?)?.cast<String>() ?? ['ko', 'en', 'ja']
-      ..aiWhisper = j['aiWhisper'] as String? ?? 'whisper-base';
+      ..externalPlayers = ((j['externalPlayers'] as Map?) ?? const {}).cast<String, String>();
     // 분야를 먼저 읽는다 - 바뀐 기본값 알림 ([_migrated]) 이 분야의 값을 본다
     for (final g in s.groups) {
       g.read(j);
diff --git a/lib/app/settings/mkv_settings.dart b/lib/app/settings/mkv_settings.dart
new file mode 100644
index 0000000..7ab80a7
--- /dev/null
+++ b/lib/app/settings/mkv_settings.dart
@@ -0,0 +1,118 @@
+import '../../core/encode_options.dart';
+import 'records.dart';
+import 'settings_group.dart';
+
+/// 약속 (설정 A): 환경 설정 > MKV · 자막 만들기 (저장 위치 · 이동 버튼 · 인코딩 · AI 자막 · OpenSubtitles) - 자기 키 (이름 · 처음 값 · 읽기 · 쓰기) 를 스스로 갖는다.
+/// 설정 하나를 더할 때는 이 파일만 고친다. 저장 파일의 키 이름은 예전 그대로 (평평한 키)
+class MkvSettings implements SettingsGroup {
+  /// MKV·자막 저장 위치. null 이면 동영상이 있는 폴더 아래 jj_mkv
+  String? outputRoot;
+
+  /// MKV 세부 정보 오른쪽 아래의 이동 버튼들 (표시 이름 · 폴더). 세 번 누르기는 첫 번째 버튼의 폴더로.
+  /// 비어 있으면 [이동] 을 처음 누를 때 폴더를 골라 하나 만든다.
+  List<MoveTarget> moveTargets = [];
+
+  /// AI 자막: 매번 설정 창을 띄울지 (끄면 마지막 설정으로 바로 시작)
+  bool askAiOptions = true;
+
+  /// OpenSubtitles (인터넷 자막 검색) - 키는 필수, 아이디·비밀번호는 선택 (받기 횟수 늘어남)
+  String openSubtitlesKey = '';
+  String openSubtitlesUser = '';
+  String openSubtitlesPassword = '';
+
+  /// 동시에 만드는 MKV 수 (0 = 무제한)
+  int maxParallelJobs = 5;
+
+  /// 폰 세로 (좁은 화면) MKV 목록 크기: 'auto' 목록은 내용만큼 · 자세히 칸에 최소 높이 (처음 값) · 'small' · 'large' (관리자 판단 10/17)
+  String compactList = 'auto';
+
+  /// P0: MKV 를 만들 때 결과 MKV 가 이미 있으면 - 'ask' 묻기 (처음 값) · 'overwrite' 덮어쓰기 · 'skip' 건너뛰기 · 'rename' 다른 이름.
+  /// 덮어쓰기여도 다 만든 뒤에만 바꿔 넣는다 (도중에 취소 · 실패하면 예전 것 그대로)
+  String existing = 'ask';
+
+  /// 47: MKV 목록에서 세 번 누르면 'move' (확인 뒤 이동 폴더로) · 'none' (아무것도 안 함)
+  String tripleTapAction = 'move';
+
+  /// 마지막 인코딩 설정
+  EncodeSettings encode = const EncodeSettings();
+
+  /// 마지막 AI 자막 설정
+  String aiSource = 'und';
+  List<String> aiTargets = ['ko', 'en', 'ja'];
+  String aiWhisper = 'whisper-base';
+
+  /// 색 보정 값 (-100 ~ 100)
+  static int _adj(Object? v) => ((v as num?)?.round() ?? 0).clamp(-100, 100);
+
+  @override
+  void write(Map<String, Object?> j, {required bool plainSecrets}) {
+    j['mkvOutputRoot'] = outputRoot;
+    j['moveTargets'] = [for (final t in moveTargets) t.toJson()];
+    j['askAiOptions'] = askAiOptions;
+    // 비밀 값은 안전 저장소에 (54). 파일에는 저장해 두었는지만
+    j['openSubtitlesSaved'] = {
+      'key': openSubtitlesKey.isNotEmpty,
+      'user': openSubtitlesUser.isNotEmpty,
+      'password': openSubtitlesPassword.isNotEmpty,
+    };
+    if (plainSecrets) {
+      j['openSubtitlesKey'] = openSubtitlesKey;
+      j['openSubtitlesUser'] = openSubtitlesUser;
+      j['openSubtitlesPassword'] = openSubtitlesPassword;
+    }
+    j['maxParallelJobs'] = maxParallelJobs;
+    j['mkvCompactList'] = compactList;
+    j['mkvExisting'] = existing;
+    j['tripleTapAction'] = tripleTapAction;
+    j['encode'] = {
+      'codec': encode.codec.name,
+      'resolution': encode.resolution.name,
+      'quality': encode.quality.name,
+      'frame': encode.frame.name,
+      'fit': encode.fit.name,
+      'rotate': encode.rotate.name,
+      'brightness': encode.brightness,
+      'contrast': encode.contrast,
+      'saturation': encode.saturation,
+      'temperature': encode.temperature,
+    };
+    j['aiSource'] = aiSource;
+    j['aiTargets'] = aiTargets;
+    j['aiWhisper'] = aiWhisper;
+  }
+
+  @override
+  void read(Map<String, dynamic> j) {
+    final e = (j['encode'] as Map?) ?? const {};
+    outputRoot = j['mkvOutputRoot'] as String?;
+    moveTargets = [
+      for (final x in (j['moveTargets'] as List?) ?? const [])
+        if (x is Map && x['dir'] is String) MoveTarget.fromJson(x),
+      // 예전 판의 이동 폴더 하나 → "이동" 버튼으로
+      if (j['moveTargets'] == null && j['moveTargetDir'] is String) MoveTarget('이동', j['moveTargetDir'] as String),
+    ];
+    askAiOptions = j['askAiOptions'] as bool? ?? true;
+    openSubtitlesKey = j['openSubtitlesKey'] as String? ?? '';
+    openSubtitlesUser = j['openSubtitlesUser'] as String? ?? '';
+    openSubtitlesPassword = j['openSubtitlesPassword'] as String? ?? '';
+    maxParallelJobs = (j['maxParallelJobs'] as num?)?.toInt() ?? 5;
+    compactList = const ['auto', 'small', 'large'].contains(j['mkvCompactList']) ? j['mkvCompactList'] as String : 'auto';
+    existing = const ['rename', 'overwrite', 'skip'].contains(j['mkvExisting']) ? j['mkvExisting'] as String : 'ask';
+    tripleTapAction = j['tripleTapAction'] == 'none' ? 'none' : 'move';
+    encode = EncodeSettings(
+      codec: pickEnum(VideoCodecChoice.values, e['codec'], VideoCodecChoice.copy),
+      resolution: pickEnum(ResolutionChoice.values, e['resolution'], ResolutionChoice.original),
+      quality: pickEnum(QualityChoice.values, e['quality'], QualityChoice.normal),
+      frame: pickEnum(FrameChoice.values, e['frame'], FrameChoice.original),
+      fit: pickEnum(FitChoice.values, e['fit'], FitChoice.fill),
+      rotate: pickEnum(RotateChoice.values, e['rotate'], RotateChoice.none),
+      brightness: _adj(e['brightness']),
+      contrast: _adj(e['contrast']),
+      saturation: _adj(e['saturation']),
+      temperature: _adj(e['temperature']),
+    );
+    aiSource = j['aiSource'] as String? ?? 'und';
+    aiTargets = (j['aiTargets'] as List?)?.cast<String>() ?? ['ko', 'en', 'ja'];
+    aiWhisper = j['aiWhisper'] as String? ?? 'whisper-base';
+  }
+}
diff --git a/lib/app/settings/settings_store.dart b/lib/app/settings/settings_store.dart
index 78b3efd..17d8521 100644
--- a/lib/app/settings/settings_store.dart
+++ b/lib/app/settings/settings_store.dart
@@ -54,9 +54,9 @@ class SettingsStore {
   static const _davServers = 'dav.servers';
 
   static String _os(AppSettings s, String k) => switch (k) {
-        'openSubtitlesKey' => s.openSubtitlesKey,
-        'openSubtitlesUser' => s.openSubtitlesUser,
-        _ => s.openSubtitlesPassword,
+        'openSubtitlesKey' => s.mkv.openSubtitlesKey,
+        'openSubtitlesUser' => s.mkv.openSubtitlesUser,
+        _ => s.mkv.openSubtitlesPassword,
       };
 
   /// 지금 설정의 비밀 값 (빈 값은 넣지 않음 = 저장소에서 지움)
@@ -109,9 +109,9 @@ class SettingsStore {
       os[e.key] = v.isNotEmpty ? v : stored[e.value] ?? '';
     }
     s
-      ..openSubtitlesKey = os['openSubtitlesKey']!
-      ..openSubtitlesUser = os['openSubtitlesUser']!
-      ..openSubtitlesPassword = os['openSubtitlesPassword']!;
+      ..mkv.openSubtitlesKey = os['openSubtitlesKey']!
+      ..mkv.openSubtitlesUser = os['openSubtitlesUser']!
+      ..mkv.openSubtitlesPassword = os['openSubtitlesPassword']!;
     s.remote.webdavServers = [
       for (final x in s.remote.webdavServers)
         x.password.isNotEmpty ? x : x.copyWith(password: stored[_davKey(x.id)] ?? ''),
diff --git a/lib/services/platform_services.dart b/lib/services/platform_services.dart
index 1071e85..4cea341 100644
--- a/lib/services/platform_services.dart
+++ b/lib/services/platform_services.dart
@@ -114,9 +114,9 @@ class PlatformServices {
         usage: Platform.isWindows ? WindowsUsage() : null,
         createSubtitleProviders: (s) => [
           OpenSubtitlesProvider(
-            apiKey: () => s().openSubtitlesKey,
-            username: () => s().openSubtitlesUser,
-            password: () => s().openSubtitlesPassword,
+            apiKey: () => s().mkv.openSubtitlesKey,
+            username: () => s().mkv.openSubtitlesUser,
+            password: () => s().mkv.openSubtitlesPassword,
           ),
         ],
       );
@@ -137,9 +137,9 @@ class PlatformServices {
         shell: AndroidShell(),
         createSubtitleProviders: (s) => [
           OpenSubtitlesProvider(
-            apiKey: () => s().openSubtitlesKey,
-            username: () => s().openSubtitlesUser,
-            password: () => s().openSubtitlesPassword,
+            apiKey: () => s().mkv.openSubtitlesKey,
+            username: () => s().mkv.openSubtitlesUser,
+            password: () => s().mkv.openSubtitlesPassword,
           ),
         ],
       );
diff --git a/lib/ui/ai_dialog.dart b/lib/ui/ai_dialog.dart
index 0c434b4..c5fe0e0 100644
--- a/lib/ui/ai_dialog.dart
+++ b/lib/ui/ai_dialog.dart
@@ -41,7 +41,7 @@ Future<void> showAiDialog(BuildContext context, AppController c, VideoItem curre
       );
   // 환경 설정에서 "매번 묻기" 를 끄면 사용자가 고른 대로 묻지 않는다 (마지막 설정으로).
   // 138: 다만 [MKV 만들기] 와 헷갈려 잘못 누른 것을 되돌릴 수 있게 3초 알림 ([취소]) 뒤에 시작한다.
-  if (!c.settings.askAiOptions) {
+  if (!c.settings.mkv.askAiOptions) {
     final messenger = ScaffoldMessenger.maybeOf(context);
     if (messenger == null) return run(list, c.aiOptions);
     var cancelled = false;
diff --git a/lib/ui/existing_output_dialog.dart b/lib/ui/existing_output_dialog.dart
index 875aa49..5924f39 100644
--- a/lib/ui/existing_output_dialog.dart
+++ b/lib/ui/existing_output_dialog.dart
@@ -10,7 +10,7 @@ import '../l10n/tr.dart';
 /// 돌려주는 것: 'overwrite' · 'skip' · 'rename', 이미 있는 것이 없으면 설정 값 그대로, [취소] 면 null (만들지 않음).
 /// 예전에는 묻지 않고 시작해, 도중에 취소하면 예전에 완성한 MKV 까지 사라졌다
 Future<String?> askExistingOutputs(BuildContext context, AppController c, List<VideoItem> targets) async {
-  final mode = c.settings.mkvExisting;
+  final mode = c.settings.mkv.existing;
   if (mode != 'ask') return mode;
   final have = await c.withExistingOutput(targets);
   if (have.isEmpty || !context.mounted) return 'ask';
diff --git a/lib/ui/explorer_bookmarks.dart b/lib/ui/explorer_bookmarks.dart
index fccf4d8..9a13b84 100644
--- a/lib/ui/explorer_bookmarks.dart
+++ b/lib/ui/explorer_bookmarks.dart
@@ -75,7 +75,7 @@ class _BookmarksDialogState extends State<_BookmarksDialog> {
     // 바로 가기: 다운로드 폴더 · MKV 결과 폴더 (넣지 않아도)
     final shortcuts = [
       (tr('다운로드'), s.resolvedDownloadRoot()),
-      if (s.mkvOutputRoot?.isNotEmpty ?? false) (tr('MKV 결과 폴더'), s.mkvOutputRoot!),
+      if (s.mkv.outputRoot?.isNotEmpty ?? false) (tr('MKV 결과 폴더'), s.mkv.outputRoot!),
     ].where((x) => !mine.any((b) => !b.isPair && samePath(b.path, x.$2))).toList();
     final already = mine.any((b) => !b.isPair && samePath(b.path, widget.current));
     final pairAlready = _rsync && mine.any((b) => b.isPair && samePath(b.path, widget.current) && samePath(b.right!, widget.right!));
diff --git a/lib/ui/home_page.dart b/lib/ui/home_page.dart
index 0560584..40dae7d 100644
--- a/lib/ui/home_page.dart
+++ b/lib/ui/home_page.dart
@@ -861,7 +861,7 @@ class _VideoTile extends StatelessWidget {
       if (!context.mounted) return;
       if (n == 2) {
         playFiles(context, c, [v.path]);
-      } else if (n >= 3 && c.settings.tripleTapAction == 'move') {
+      } else if (n >= 3 && c.settings.mkv.tripleTapAction == 'move') {
         // 47: 잘못 세 번 눌러도 파일이 옮겨지지 않게 묻는다
         moveToTarget(context, c, [v], confirm: true);
       }
@@ -1003,7 +1003,7 @@ class _CompactBody extends StatelessWidget {
   Widget build(BuildContext context) => LayoutBuilder(builder: (context, box) {
         final h = box.maxHeight;
         final picked = c.selected != null;
-        final cap = switch (c.settings.mkvCompactList) {
+        final cap = switch (c.settings.mkv.compactList) {
           'small' => h * 0.25,
           'large' => h * 0.55,
           // 자동: 자세히 칸 최소 - 고른 동영상이 있으면 62% (세부 정보 · 자막 버튼이 칸 밖으로 밀리지 않게, 261 · 266),
@@ -1011,7 +1011,7 @@ class _CompactBody extends StatelessWidget {
           _ => h - (picked ? h * 0.62 : math.min(120.0, h * 0.4)),
         }.clamp(math.min(120.0, h), h).toDouble();
         // 줄이 많아 내용이 칸보다 확실히 길면 칸 높이 그대로 (shrinkWrap 은 줄을 모두 그려 느리다)
-        final shrink = c.settings.mkvCompactList == 'auto' && c.videos.length * _rowMin < cap;
+        final shrink = c.settings.mkv.compactList == 'auto' && c.videos.length * _rowMin < cap;
         return Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
           if (shrink)
             ConstrainedBox(constraints: BoxConstraints(maxHeight: cap), child: _VideoList(c: c, shrink: true))
@@ -1088,7 +1088,7 @@ class _VideoDetail extends StatelessWidget {
     final moving = c.checked.isEmpty ? [v] : c.batchTargets;
     final canMove = moving.any((x) => x.status != JobStatus.running);
     final count = c.checked.isEmpty ? '' : ' (${c.checked.length})';
-    final buttons = c.settings.moveTargets;
+    final buttons = c.settings.mkv.moveTargets;
     Widget button(MoveTarget? t) => Tooltip(
           message: t == null
               ? tr('이동: 옮길 폴더를 골라 이동 버튼을 만듭니다 (환경 설정 > MKV 만들기 > 이동 버튼에서 여러 개 만들 수 있음)')
@@ -1538,13 +1538,13 @@ Future<void> moveToTarget(BuildContext context, AppController c, List<VideoItem>
     {MoveTarget? target, bool confirm = false}) async {
   if (videos.isEmpty) return;
   final messenger = ScaffoldMessenger.maybeOf(context);
-  var t = target ?? c.settings.moveTargets.firstOrNull;
+  var t = target ?? c.settings.mkv.moveTargets.firstOrNull;
   if (t == null) {
     final d = await pickFolder(context, tr('이동 폴더 (환경 설정에서 바꿀 수 있음)'));
     if (d == null) return;
     t = MoveTarget(p.basename(d).isEmpty ? tr('이동') : p.basename(d), d);
     final add = t;
-    await c.updateSettings((x) => x.moveTargets = [...x.moveTargets, add]);
+    await c.updateSettings((x) => x.mkv.moveTargets = [...x.mkv.moveTargets, add]);
   } else if (confirm && context.mounted) {
     final ok = await confirmAction(
       context,
diff --git a/lib/ui/master_prompt.dart b/lib/ui/master_prompt.dart
index e2a17e2..53d6743 100644
--- a/lib/ui/master_prompt.dart
+++ b/lib/ui/master_prompt.dart
@@ -146,8 +146,8 @@ Future<void> clearStoredSecrets(AppController c) => c.updateSettings((s) => s
   ..remote.ftpServers = [for (final x in s.remote.ftpServers) x.copyWith(password: '')]
   // AI 서비스 API 키도 (문구 "비밀번호 · API 키" 와 같게 - 예전에는 남았다, 관리자 결정 10/17)
   ..aiImage.services = [for (final x in s.aiImage.services) x.copyWith(apiKey: '')]
-  ..openSubtitlesKey = ''
-  ..openSubtitlesPassword = '').then((_) async {
+  ..mkv.openSubtitlesKey = ''
+  ..mkv.openSubtitlesPassword = '').then((_) async {
   // 관리자 판단 (10/21): 다른 판 (새 판) 이 안전 저장소에 넣은 이 판이 모르는 비밀번호 · 키도 (마스터 · 최상은 남김)
   await c.settingsStore?.clearForeignSecrets();
 });
diff --git a/lib/ui/settings/media_sections.dart b/lib/ui/settings/media_sections.dart
index 25f05a8..7da6bd7 100644
--- a/lib/ui/settings/media_sections.dart
+++ b/lib/ui/settings/media_sections.dart
@@ -50,12 +50,12 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                       title: Text(tr('동영상을 세 번 누르면')),
                       subtitle: Text(tr('한 번: 보기 · 두 번: 재생 · 세 번: 이동 폴더로 옮기기 (옮기기 전에 묻습니다)')),
                       trailing: DropdownButton<String>(
-                        value: s.tripleTapAction,
+                        value: s.mkv.tripleTapAction,
                         items: [
                           DropdownMenuItem(value: 'move', child: Text(tr('이동 폴더로 (확인 뒤, 기본)'))),
                           DropdownMenuItem(value: 'none', child: Text(tr('아무것도 안 함'))),
                         ],
-                        onChanged: (v) => c.updateSettings((x) => x.tripleTapAction = v!),
+                        onChanged: (v) => c.updateSettings((x) => x.mkv.tripleTapAction = v!),
                       ),
                     ),
                     // P0: 결과 MKV 가 이미 있을 때 (처음 값: 묻기)
@@ -63,14 +63,14 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                       title: Text(tr('만들 MKV 가 이미 있으면')),
                       subtitle: Text(tr('덮어쓰기여도 다 만든 뒤에만 바꿉니다 (도중에 취소 · 실패하면 예전 MKV 그대로)')),
                       trailing: DropdownButton<String>(
-                        value: const ['ask', 'overwrite', 'skip', 'rename'].contains(s.mkvExisting) ? s.mkvExisting : 'ask',
+                        value: const ['ask', 'overwrite', 'skip', 'rename'].contains(s.mkv.existing) ? s.mkv.existing : 'ask',
                         items: [
                           DropdownMenuItem(value: 'ask', child: Text(tr('묻기'))),
                           DropdownMenuItem(value: 'overwrite', child: Text(tr('덮어쓰기'))),
                           DropdownMenuItem(value: 'skip', child: Text(tr('건너뛰기'))),
                           DropdownMenuItem(value: 'rename', child: Text(tr('다른 이름 (이름 (2).mkv)'))),
                         ],
-                        onChanged: (v) => c.updateSettings((x) => x.mkvExisting = v ?? 'ask'),
+                        onChanged: (v) => c.updateSettings((x) => x.mkv.existing = v ?? 'ask'),
                       ),
                     ),
                     // 15 지적 · 관리자 판단 (10/17): 폰 세로에서 목록 · 자세히 칸 나누기
@@ -78,21 +78,21 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                       title: Text(tr('폰 세로 목록 크기')),
                       subtitle: Text(tr('좁은 화면에서 동영상 목록이 차지하는 높이 (자동: 목록은 줄 수만큼, 자세히 칸 자리는 남김)')),
                       trailing: DropdownButton<String>(
-                        value: s.mkvCompactList,
+                        value: s.mkv.compactList,
                         items: [
                           DropdownMenuItem(value: 'auto', child: Text(tr('자동 (기본)'))),
                           DropdownMenuItem(value: 'small', child: Text(tr('작게'))),
                           DropdownMenuItem(value: 'large', child: Text(tr('크게'))),
                         ],
-                        onChanged: (v) => c.updateSettings((x) => x.mkvCompactList = v ?? 'auto'),
+                        onChanged: (v) => c.updateSettings((x) => x.mkv.compactList = v ?? 'auto'),
                       ),
                     ),
                     SettingTile(
                       title: Text(tr('동시 MKV 변환 수')),
                       subtitle: Text(tr('여러 동영상을 MKV 로 만들 때 동시에 처리할 개수 (재인코딩은 CPU 를 많이 씁니다)')),
                       trailing: CountSelector(
-                        value: s.maxParallelJobs,
-                        onChanged: (n) => c.updateSettings((x) => x.maxParallelJobs = n),
+                        value: s.mkv.maxParallelJobs,
+                        onChanged: (n) => c.updateSettings((x) => x.mkv.maxParallelJobs = n),
                       ),
                     ),
                     SettingTile(
@@ -101,16 +101,16 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                     ),
                     settingsFolderTile(
                       title: tr('MKV · 자막 (jj_mkv)'),
-                      value: s.mkvOutputRoot,
+                      value: s.mkv.outputRoot,
                       defaultText: tr('동영상이 있는 폴더 아래 jj_mkv (기본)'),
                       onPick: () async {
-                        final d = await pickFolder(context, tr('MKV · 자막 저장 위치'), s.mkvOutputRoot);
-                        if (d != null) await c.updateSettings((x) => x.mkvOutputRoot = d);
+                        final d = await pickFolder(context, tr('MKV · 자막 저장 위치'), s.mkv.outputRoot);
+                        if (d != null) await c.updateSettings((x) => x.mkv.outputRoot = d);
                       },
-                      onReset: () => c.updateSettings((x) => x.mkvOutputRoot = null),
+                      onReset: () => c.updateSettings((x) => x.mkv.outputRoot = null),
                     ),
                     settingsSubTitle(tr('이동 버튼 (세부 정보 오른쪽 아래, 위로 하나씩)')),
-                    for (var i = 0; i < s.moveTargets.length; i++) MoveTargetTile(c: c, index: i, target: s.moveTargets[i]),
+                    for (var i = 0; i < s.mkv.moveTargets.length; i++) MoveTargetTile(c: c, index: i, target: s.mkv.moveTargets[i]),
                     Padding(
                       padding: const EdgeInsets.fromLTRB(16, 4, 16, 8),
                       child: Row(children: [
@@ -119,7 +119,7 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                             final d = await pickFolder(context, tr('이동 버튼의 폴더'));
                             if (d == null) return;
                             final name = p.basename(d).isEmpty ? tr('이동') : p.basename(d);
-                            await c.updateSettings((x) => x.moveTargets = [...x.moveTargets, MoveTarget(name, d)]);
+                            await c.updateSettings((x) => x.mkv.moveTargets = [...x.mkv.moveTargets, MoveTarget(name, d)]);
                           },
                           icon: const Icon(Icons.add, size: 18),
                           label: Text(tr('이동 버튼 추가')),
@@ -127,7 +127,7 @@ class _MkvSettingsSectionState extends State<MkvSettingsSection> {
                         const SizedBox(width: 12),
                         Expanded(
                           child: Text(
-                            s.moveTargets.isEmpty
+                            s.mkv.moveTargets.isEmpty
                                 ? tr('없음: 세부 정보의 [이동] 을 처음 누를 때 폴더를 골라 하나 만듭니다')
                                 : tr('표시 이름은 바로 고칠 수 있습니다. 동영상 줄을 세 번 누르면 첫 번째 버튼의 폴더로 옮깁니다'),
                             style: TextStyle(fontSize: 12, color: JjColors.textDim),
@@ -161,8 +161,8 @@ class _SubtitleSettingsSectionState extends State<SubtitleSettingsSection> {
     final s = c.settings;
     return Column(crossAxisAlignment: CrossAxisAlignment.stretch, mainAxisSize: MainAxisSize.min, children: [
                     SwitchListTile(
-                      value: s.askAiOptions,
-                      onChanged: (v) => c.updateSettings((x) => x.askAiOptions = v),
+                      value: s.mkv.askAiOptions,
+                      onChanged: (v) => c.updateSettings((x) => x.mkv.askAiOptions = v),
                       title: Text(tr('시작할 때마다 설정 창 보기')),
                       subtitle: Text(trf('끄면 마지막 설정으로 바로 시작: 원어 {0}, ' '언어 {1}, {2}', [c.aiOptions.source.name, c.aiOptions.targets.map((t) => t.code).join('/'), c.aiOptions.whisper.label])),
                     ),
@@ -170,13 +170,13 @@ class _SubtitleSettingsSectionState extends State<SubtitleSettingsSection> {
                     settingsSubTitle(tr('받은 AI 자막 모델')),
                     AiSubtitleModels(c: c),
                     settingsSubTitle(tr('인터넷 자막 (OpenSubtitles.com)')),
-                    settingsTextTile(tr('API 키 (필수, 무료)'), s.openSubtitlesKey,
+                    settingsTextTile(tr('API 키 (필수, 무료)'), s.mkv.openSubtitlesKey,
                         tr('가입 → 프로필 → API consumers → New consumer'),
-                        (v) => c.updateSettings((x) => x.openSubtitlesKey = v.trim())),
-                    settingsTextTile(tr('아이디 (선택)'), s.openSubtitlesUser, tr('로그인하면 하루 받기 횟수가 늘어납니다'),
-                        (v) => c.updateSettings((x) => x.openSubtitlesUser = v.trim())),
-                    settingsTextTile(tr('비밀번호 (선택)'), s.openSubtitlesPassword, trf('이 {0}의 안전 저장소에 저장됩니다 (설정 파일에는 쓰지 않음)', [desk ? 'PC' : tr('기기')]),
-                        (v) => c.updateSettings((x) => x.openSubtitlesPassword = v), obscure: true),
+                        (v) => c.updateSettings((x) => x.mkv.openSubtitlesKey = v.trim())),
+                    settingsTextTile(tr('아이디 (선택)'), s.mkv.openSubtitlesUser, tr('로그인하면 하루 받기 횟수가 늘어납니다'),
+                        (v) => c.updateSettings((x) => x.mkv.openSubtitlesUser = v.trim())),
+                    settingsTextTile(tr('비밀번호 (선택)'), s.mkv.openSubtitlesPassword, trf('이 {0}의 안전 저장소에 저장됩니다 (설정 파일에는 쓰지 않음)', [desk ? 'PC' : tr('기기')]),
+                        (v) => c.updateSettings((x) => x.mkv.openSubtitlesPassword = v), obscure: true),
     ]);
   }
 }
@@ -273,7 +273,7 @@ class MoveTargetTile extends StatelessWidget {
     final i = index, t = target;
     final s = c.settings;
     void update(List<MoveTarget> Function(List<MoveTarget>) f) =>
-        c.updateSettings((x) => x.moveTargets = f([...x.moveTargets]));
+        c.updateSettings((x) => x.mkv.moveTargets = f([...x.mkv.moveTargets]));
     return SettingTile(
       key: ValueKey('move_${i}_${t.dir}'),
       leading: Icon(Icons.drive_file_move_outline, color: JjColors.accent),
@@ -302,7 +302,7 @@ class MoveTargetTile extends StatelessWidget {
         IconButton(
           tooltip: tr('이 이동 버튼 지우기'),
           icon: const Icon(Icons.delete_outline),
-          onPressed: s.moveTargets.length > i ? () => update((l) => l..removeAt(i)) : null,
+          onPressed: s.mkv.moveTargets.length > i ? () => update((l) => l..removeAt(i)) : null,
         ),
       ]),
     );
diff --git a/lib/ui/subtitle_search_dialog.dart b/lib/ui/subtitle_search_dialog.dart
index cc73cd0..7bb5683 100644
--- a/lib/ui/subtitle_search_dialog.dart
+++ b/lib/ui/subtitle_search_dialog.dart
@@ -28,7 +28,7 @@ class _SearchDialogState extends State<_SearchDialog> {
   final _episode = TextEditingController();
   final _key = TextEditingController();
   late Set<Language> _langs = {
-    for (final code in widget.c.settings.aiTargets)
+    for (final code in widget.c.settings.mkv.aiTargets)
       if (languageOf(code) != undetermined) languageOf(code),
   };
   String? _hash;
@@ -169,7 +169,7 @@ class _SearchDialogState extends State<_SearchDialog> {
           FilledButton(
             onPressed: () async {
               if (_key.text.trim().isEmpty) return;
-              await c.updateSettings((s) => s.openSubtitlesKey = _key.text.trim());
+              await c.updateSettings((s) => s.mkv.openSubtitlesKey = _key.text.trim());
               setState(() {});
               _search();
             },
diff --git a/test/ai_confirm_test.dart b/test/ai_confirm_test.dart
index e742ba5..70b62b0 100644
--- a/test/ai_confirm_test.dart
+++ b/test/ai_confirm_test.dart
@@ -29,7 +29,7 @@ void main() {
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.reset);
     final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
-    c.settings.askAiOptions = false;
+    c.settings.mkv.askAiOptions = false;
     final v1 = VideoItem(r'C:\v\a.mp4')..info = const MediaInfo(duration: Duration(minutes: 30));
     final v2 = VideoItem(r'C:\v\b.mp4')..info = const MediaInfo(duration: Duration(minutes: 30));
     late BuildContext ctx;
@@ -61,7 +61,7 @@ void main() {
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.reset);
     final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
-    expect(c.settings.askAiOptions, isTrue);
+    expect(c.settings.mkv.askAiOptions, isTrue);
     final v1 = VideoItem(r'C:\v\a.mp4')..info = const MediaInfo(duration: Duration(hours: 1));
     late BuildContext ctx;
     await tester.pumpWidget(MaterialApp(home: Scaffold(body: Builder(builder: (context) {
diff --git a/test/batch_test.dart b/test/batch_test.dart
index c60eca0..f4922d0 100644
--- a/test/batch_test.dart
+++ b/test/batch_test.dart
@@ -263,7 +263,7 @@ void main() {
     }
     final c = AppController(PlatformServices(mediaTool: tool, storage: DesktopStorageService()));
     await c.init();
-    c.settings.maxParallelJobs = 1;
+    c.settings.mkv.maxParallelJobs = 1;
     c.encode = const EncodeSettings(codec: VideoCodecChoice.h264, quality: QualityChoice.high);
     await c.addVideos(files);
     final [v1, v2, v3] = c.videos;
@@ -304,7 +304,7 @@ void main() {
       }
       c = AppController(PlatformServices(mediaTool: tool, storage: DesktopStorageService()));
       await c.init();
-      c.settings.maxParallelJobs = 1;
+      c.settings.mkv.maxParallelJobs = 1;
       c.encode = const EncodeSettings(codec: VideoCodecChoice.h264, quality: QualityChoice.high);
       await c.addVideos(files);
       return true;
@@ -386,7 +386,7 @@ void main() {
     }
     final c = AppController(PlatformServices(mediaTool: tool, storage: DesktopStorageService()));
     await c.init();
-    c.settings.maxParallelJobs = 1;
+    c.settings.mkv.maxParallelJobs = 1;
     c.encode = const EncodeSettings(codec: VideoCodecChoice.h264, quality: QualityChoice.high);
     await c.addVideos(files);
     final [v1, v2, v3] = c.videos;
@@ -442,7 +442,7 @@ void main() {
       tester.view.devicePixelRatio = 1;
       addTearDown(tester.view.reset);
       final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
-      c.settings.moveTargets = [for (var i = 0; i < targets; i++) MoveTarget('보관$i', 'D:\\m$i')];
+      c.settings.mkv.moveTargets = [for (var i = 0; i < targets; i++) MoveTarget('보관$i', 'D:\\m$i')];
       c.videos.add(VideoItem(r'D:\v\a.mp4')
         ..info = const MediaInfo(duration: Duration(minutes: 3), streams: [
           StreamInfo(index: 0, type: 'video', codec: 'h264', width: 1920, height: 1080),
@@ -750,8 +750,8 @@ void main() {
     final c = AppController(PlatformServices(mediaTool: tool, storage: DesktopStorageService()));
     await c.init();
     c.settings
-      ..maxParallelJobs = 1
-      ..mkvExisting = 'overwrite';
+      ..mkv.maxParallelJobs = 1
+      ..mkv.existing = 'overwrite';
     await c.addVideos(files);
     final [v1, v2, v3] = c.videos;
     File(outputMkvPath(v1.path))
@@ -800,7 +800,7 @@ void main() {
     late Future<void> building;
     await tester.runAsync(() async {
       await c.init();
-      c.settings.maxParallelJobs = 1;
+      c.settings.mkv.maxParallelJobs = 1;
       await c.addVideos(files);
       building = c.buildVideos([...c.videos]);
       for (var i = 0; i < 200 && tool.runs.isEmpty; i++) {
@@ -850,7 +850,7 @@ void main() {
     late Future<void> building;
     await tester.runAsync(() async {
       await c.init();
-      c.settings.maxParallelJobs = 5;
+      c.settings.mkv.maxParallelJobs = 5;
       await c.addVideos(files);
       building = c.buildVideos([...c.videos]);
       for (var i = 0; i < 200 && tool.runs.length < 2; i++) {
diff --git a/test/decisions_test.dart b/test/decisions_test.dart
index 96fd32b..38de083 100644
--- a/test/decisions_test.dart
+++ b/test/decisions_test.dart
@@ -31,7 +31,7 @@ void main() {
       s.rememberPasswords, s.recycleOnDelete, s.reader.systemBars,
     ], everyElement(isTrue));
     expect(s.cleanupPrechecked, ['work', 'download']);
-    expect(s.tripleTapAction, 'move');
+    expect(s.mkv.tripleTapAction, 'move');
     expect(s.remote.davExternalOpen, 'ask');
     // 이미 있던 설정의 기본값도 결정대로
     expect([s.browser.pauseOnLeave, s.run.autoCheckUpdates, s.browser.adSkip, s.browser.adHide, s.run.inBackground, s.display.swipeNav],
@@ -49,12 +49,12 @@ void main() {
           ..rememberPasswords = false
           ..recycleOnDelete = false
           ..cleanupPrechecked = ['logs']
-          ..tripleTapAction = 'none'
+          ..mkv.tripleTapAction = 'none'
           ..remote.davExternalOpen = 'url')
         .toJson());
     expect([b.run.startMenuShortcut, b.copy.syncStopToast, b.display.swipeWrap, b.migrationNotice, b.allowInnerToOuter, b.rememberPasswords,
         b.recycleOnDelete], everyElement(isFalse));
-    expect([b.cleanupPrechecked, b.tripleTapAction, b.remote.davExternalOpen], [['logs'], 'none', 'url']);
+    expect([b.cleanupPrechecked, b.mkv.tripleTapAction, b.remote.davExternalOpen], [['logs'], 'none', 'url']);
   });
 
   test('안쪽 → 바깥 허용을 끄면 늘 막는다', () {
diff --git a/test/download_test.dart b/test/download_test.dart
index e26be3a..2b8c207 100644
--- a/test/download_test.dart
+++ b/test/download_test.dart
@@ -139,20 +139,20 @@ https://example.com/page.html
     final store = SettingsStore(p.join(dir.path, 'settings.json'));
     expect((await store.load()).download.clipboardWatch, isTrue); // 파일 없으면 기본값
     final s = AppSettings()
-      ..mkvOutputRoot = r'D:\out'
+      ..mkv.outputRoot = r'D:\out'
       ..download.root = r'D:\dl'
       ..download.clipboardWatch = false
       ..run.showHotkey = 'Alt+F9'
-      ..askAiOptions = false
-      ..encode = const EncodeSettings(codec: VideoCodecChoice.vp9, resolution: ResolutionChoice.p720)
-      ..aiTargets = ['ko', 'fr'];
+      ..mkv.askAiOptions = false
+      ..mkv.encode = const EncodeSettings(codec: VideoCodecChoice.vp9, resolution: ResolutionChoice.p720)
+      ..mkv.aiTargets = ['ko', 'fr'];
     await store.save(s);
     final l = await store.load();
-    expect([l.mkvOutputRoot, l.download.root, l.download.clipboardWatch, l.run.showHotkey, l.askAiOptions],
+    expect([l.mkv.outputRoot, l.download.root, l.download.clipboardWatch, l.run.showHotkey, l.mkv.askAiOptions],
         [r'D:\out', r'D:\dl', false, 'Alt+F9', false]);
-    expect(l.encode.codec, VideoCodecChoice.vp9);
-    expect(l.encode.resolution, ResolutionChoice.p720);
-    expect(l.aiTargets, ['ko', 'fr']);
+    expect(l.mkv.encode.codec, VideoCodecChoice.vp9);
+    expect(l.mkv.encode.resolution, ResolutionChoice.p720);
+    expect(l.mkv.aiTargets, ['ko', 'fr']);
     expect(l.ytDlpDir, p.join(r'D:\dl', 'jj_yt-dlp'));
     expect(l.aria2Dir, p.join(r'D:\dl', 'jj_aria2'));
   });
diff --git a/test/master_lock_test.dart b/test/master_lock_test.dart
index 260650e..4a75e75 100644
--- a/test/master_lock_test.dart
+++ b/test/master_lock_test.dart
@@ -191,9 +191,9 @@ void main() {
       final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
       c.settings
         ..remote.webdavServers = [const DavServer(id: 'n', name: 'NAS', url: 'https://nas', user: 'u', password: 'pw')]
-        ..openSubtitlesKey = 'k'
-        ..openSubtitlesUser = 'ou'
-        ..openSubtitlesPassword = 'op';
+        ..mkv.openSubtitlesKey = 'k'
+        ..mkv.openSubtitlesUser = 'ou'
+        ..mkv.openSubtitlesPassword = 'op';
       return c;
     }
 
@@ -256,7 +256,7 @@ void main() {
       expect(find.text('초기화했습니다'), findsOneWidget);
       expect(c.settings.remote.webdavServers.single.password, '');
       expect(c.settings.remote.webdavServers.single.user, 'u');
-      expect((c.settings.openSubtitlesKey, c.settings.openSubtitlesPassword, c.settings.openSubtitlesUser), ('', '', 'ou'));
+      expect((c.settings.mkv.openSubtitlesKey, c.settings.mkv.openSubtitlesPassword, c.settings.mkv.openSubtitlesUser), ('', '', 'ou'));
       expect(lock.hasMaster, isFalse);
     });
 
@@ -283,8 +283,8 @@ void main() {
       final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()),
           settingsStore: store);
       await c.updateSettings((s) => s
-        ..openSubtitlesKey = 'k'
-        ..openSubtitlesPassword = 'op'
+        ..mkv.openSubtitlesKey = 'k'
+        ..mkv.openSubtitlesPassword = 'op'
         ..remote.webdavServers = [const DavServer(id: 'd1', name: 'n', url: 'https://x', user: 'u', password: 'dp')]
         ..remote.sftpServers = [const SftpServer(id: 's1', name: 'n', host: 'h', user: 'u', password: 'sp', privateKey: 'PRIVATE KEY', keyPassphrase: 'kp')]
         ..aiImage.services = [const AiService(id: 'a1', name: 'n', url: 'https://ai', kind: 'openai', apiKey: 'ak')]);
diff --git a/test/mkv_compact_list_test.dart b/test/mkv_compact_list_test.dart
index a36ea03..79315f1 100644
--- a/test/mkv_compact_list_test.dart
+++ b/test/mkv_compact_list_test.dart
@@ -21,7 +21,7 @@ void main() {
     ));
     c.settings
       ..display.showLog = true
-      ..mkvCompactList = size;
+      ..mkv.compactList = size;
     for (var i = 0; i < n; i++) {
       c.videos.add(VideoItem('D:/v/v$i.mp4'));
     }
diff --git a/test/mkv_portrait_detail_test.dart b/test/mkv_portrait_detail_test.dart
index dbc830a..cd366ee 100644
--- a/test/mkv_portrait_detail_test.dart
+++ b/test/mkv_portrait_detail_test.dart
@@ -23,7 +23,7 @@ void main() {
         createTranslator: () => throw UnimplementedError(),
       ));
       c.settings.display.showLog = true;
-      c.settings.moveTargets = [MoveTarget('보관', r'D:\보관')];
+      c.settings.mkv.moveTargets = [MoveTarget('보관', r'D:\보관')];
       for (var i = 1; i <= 4; i++) {
         c.videos.add(VideoItem('D:/v/아주 긴 이름의 동영상 파일 $i.mp4'));
       }
diff --git a/test/move_test.dart b/test/move_test.dart
index 368d492..08b3155 100644
--- a/test/move_test.dart
+++ b/test/move_test.dart
@@ -142,10 +142,10 @@ void main() {
 
   test('이동 버튼 설정 저장 (표시 이름 · 폴더 · 순서), 예전 이동 폴더 하나는 "이동" 버튼으로', () {
     final s = AppSettings()
-      ..moveTargets = const [MoveTarget('완료', r'D:\done'), MoveTarget('보관', r'E:\archive')];
-    expect(AppSettings.fromJson(s.toJson()).moveTargets, s.moveTargets);
-    expect(AppSettings().moveTargets, isEmpty);
-    expect(AppSettings.fromJson({'moveTargetDir': r'D:\old'}).moveTargets, const [MoveTarget('이동', r'D:\old')]);
+      ..mkv.moveTargets = const [MoveTarget('완료', r'D:\done'), MoveTarget('보관', r'E:\archive')];
+    expect(AppSettings.fromJson(s.toJson()).mkv.moveTargets, s.mkv.moveTargets);
+    expect(AppSettings().mkv.moveTargets, isEmpty);
+    expect(AppSettings.fromJson({'moveTargetDir': r'D:\old'}).mkv.moveTargets, const [MoveTarget('이동', r'D:\old')]);
   });
 
   testWidgets('MKV 목록: 세 번 누르면 첫 번째 이동 버튼으로 · 세부 정보의 이동 버튼 (표시 이름) 은 그 폴더로', (tester) async {
@@ -155,7 +155,7 @@ void main() {
     final c = _controller();
     final dest = p.join(dir.path, 'done');
     final archive = p.join(dir.path, 'archive');
-    c.settings.moveTargets = [MoveTarget('완료함', dest), MoveTarget('보관함', archive)];
+    c.settings.mkv.moveTargets = [MoveTarget('완료함', dest), MoveTarget('보관함', archive)];
     final a = VideoItem(make('a.mp4').path);
     final b = VideoItem(make('b.mp4').path);
     final d = VideoItem(make('d.mp4').path);
@@ -200,7 +200,7 @@ void main() {
     }
     expect(File(p.join(dest, 'b.mp4')).existsSync(), isTrue);
     // 102: 세 번 누르기를 "아무것도 안 함" 으로 하면 묻지도 옮기지도 않는다
-    c.settings.tripleTapAction = 'none';
+    c.settings.mkv.tripleTapAction = 'none';
     final dTile = find.text('d.mp4').first;
     for (var i = 0; i < 3; i++) {
       await tester.tap(dTile);
@@ -210,7 +210,7 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.text('파일 옮기기'), findsNothing);
     expect(File(p.join(dest, 'd.mp4')).existsSync(), isFalse);
-    c.settings.tripleTapAction = 'move';
+    c.settings.mkv.tripleTapAction = 'move';
     expect(c.videos.map((v) => v.fileName), ['a.mp4', 'd.mp4']);
 
     // 세부 정보 오른쪽 아래: 표시 이름 버튼 두 개 (첫 번째가 아래, 두 번째가 그 위)
diff --git a/test/queue_test.dart b/test/queue_test.dart
index 820f133..33f6546 100644
--- a/test/queue_test.dart
+++ b/test/queue_test.dart
@@ -164,7 +164,7 @@ void main() {
       final tool = _Tool();
       final c = AppController(PlatformServices(mediaTool: tool, storage: DesktopStorageService()));
       await c.init();
-      c.settings.maxParallelJobs = limit;
+      c.settings.mkv.maxParallelJobs = limit;
       final dir = Directory.systemTemp.createTempSync('jj_par_');
       for (var i = 0; i < 5; i++) {
         final f = File(p.join(dir.path, 'v$i.mp4'))..writeAsStringSync(''); // 없는 파일은 만들지 않으므로
diff --git a/test/secret_store_test.dart b/test/secret_store_test.dart
index 0b778f1..bb821f1 100644
--- a/test/secret_store_test.dart
+++ b/test/secret_store_test.dart
@@ -35,8 +35,8 @@ void main() {
       'futureFeature': {'x': 1},
     }));
     final s = await store().load();
-    expect(s.openSubtitlesKey, 'KEY-1');
-    expect(s.openSubtitlesPassword, 'os-pw');
+    expect(s.mkv.openSubtitlesKey, 'KEY-1');
+    expect(s.mkv.openSubtitlesPassword, 'os-pw');
     expect(s.remote.webdavServers.single.password, 'dav-pw');
     expect(secrets.values.values, containsAll(['KEY-1', 'me', 'os-pw', 'dav-pw']));
     for (final f in [file, '$file.bak']) {
@@ -51,14 +51,14 @@ void main() {
     // 다시 켜도 그대로
     final again = await store().load();
     expect(again.remote.webdavServers.single.password, 'dav-pw');
-    expect(again.openSubtitlesKey, 'KEY-1');
+    expect(again.mkv.openSubtitlesKey, 'KEY-1');
   });
 
   test('예전 판이 서버 목록 · 비밀 값을 지운 설정 파일을 써도 되살아난다', () async {
     final st = store();
     await st.load();
     await st.save(AppSettings()
-      ..openSubtitlesKey = 'KEY-2'
+      ..mkv.openSubtitlesKey = 'KEY-2'
       ..remote.webdavServers = [const DavServer(id: 'd1', name: 'nas', url: 'https://nas', user: 'u', password: 'pw')]);
     // 예전 판: 모르는 항목을 지우고 저장
     File(file).writeAsStringSync(jsonEncode({'homeUrl': 'https://old.example'}));
@@ -66,7 +66,7 @@ void main() {
     expect(s.browser.homeUrl, 'https://old.example');
     expect(s.remote.webdavServers.single.url, 'https://nas');
     expect(s.remote.webdavServers.single.password, 'pw');
-    expect(s.openSubtitlesKey, 'KEY-2');
+    expect(s.mkv.openSubtitlesKey, 'KEY-2');
     // 사용자가 일부러 서버를 모두 지웠으면 (목록 항목은 있음) 되살리지 않는다
     final st2 = store();
     final s2 = await st2.load();
@@ -81,11 +81,11 @@ void main() {
       const DavServer(id: 'a', name: 'a', url: 'https://a', password: 'pa'),
       const DavServer(id: 'b', name: 'b', url: 'https://b', password: 'pb'),
     ];
-    s.openSubtitlesPassword = 'x';
+    s.mkv.openSubtitlesPassword = 'x';
     await st.save(s);
     expect(secrets.values.values, containsAll(['pa', 'pb', 'x']));
     s.remote.webdavServers = [s.remote.webdavServers.first];
-    s.openSubtitlesPassword = '';
+    s.mkv.openSubtitlesPassword = '';
     await st.save(s);
     expect(secrets.values.values, isNot(contains('pb')));
     expect(secrets.values.values, isNot(contains('x')));
@@ -103,7 +103,7 @@ void main() {
     }));
     final st = store();
     final s = await st.load();
-    expect(s.openSubtitlesKey, 'KEY-3');
+    expect(s.mkv.openSubtitlesKey, 'KEY-3');
     await st.save(s..browser.homeUrl = 'https://x.example');
     expect(text(file), contains('KEY-3'));
     expect(text(file), contains('plain'));
diff --git a/test/settings_store_test.dart b/test/settings_store_test.dart
index a7ee528..438e0d6 100644
--- a/test/settings_store_test.dart
+++ b/test/settings_store_test.dart
@@ -71,9 +71,9 @@ void main() {
     final secrets = MemorySecretStore()..values['sec.master'] = 'hash';
     final store = SettingsStore(p.join(tmp.path, 'settings.json'), secrets);
     final s = await store.load()
-      ..openSubtitlesKey = 'k'
-      ..openSubtitlesUser = 'u'
-      ..openSubtitlesPassword = 'op'
+      ..mkv.openSubtitlesKey = 'k'
+      ..mkv.openSubtitlesUser = 'u'
+      ..mkv.openSubtitlesPassword = 'op'
       ..remote.webdavServers = [const DavServer(id: 'd1', name: 'n', url: 'https://x', user: 'u', password: 'dp')]
       ..remote.sftpServers = [const SftpServer(id: 's1', name: 'n', host: 'h', user: 'u', password: 'sp', privateKey: 'KEY', keyPassphrase: 'kp')]
       ..remote.smbServers = [const SmbServer(id: 'm1', name: 'n', host: 'h', share: 'v', password: 'mp')]
diff --git a/test/subtitle_search_test.dart b/test/subtitle_search_test.dart
index fd41051..4a89de1 100644
--- a/test/subtitle_search_test.dart
+++ b/test/subtitle_search_test.dart
@@ -181,13 +181,13 @@ void main() {
       addTearDown(() => dir.deleteSync(recursive: true));
       final video = File(p.join(dir.path, 'Movie.2010.mkv'))..writeAsBytesSync(List.filled(200000, 7));
 
-      final settings = AppSettings()..openSubtitlesKey = 'KEY';
+      final settings = AppSettings()..mkv.openSubtitlesKey = 'KEY';
       final c = AppController(PlatformServices(
         mediaTool: tool,
         storage: DesktopStorageService(),
         createSubtitleProviders: (s) => [
           OpenSubtitlesProvider(
-              apiKey: () => s().openSubtitlesKey, username: () => '', password: () => '', baseUrl: api.base),
+              apiKey: () => s().mkv.openSubtitlesKey, username: () => '', password: () => '', baseUrl: api.base),
         ],
       ));
       c.settings = settings;
diff --git a/test/ui_test.dart b/test/ui_test.dart
index f167d78..8932942 100644
--- a/test/ui_test.dart
+++ b/test/ui_test.dart
@@ -195,7 +195,7 @@ void main() {
 
     // 체크한 것이 없으면 세부 정보에 보이는 동영상을 바로 만든다 (묻지 않음).
     // P0: 이 시험의 가짜 저장소는 모든 파일이 "있다" 고 하므로, 결과 MKV 가 있을 때 묻지 않게 덮어쓰기로
-    c.settings.mkvExisting = 'overwrite';
+    c.settings.mkv.existing = 'overwrite';
     await tester.tap(find.text('MKV 만들기'));
     await tester.pumpAndSettle();
     expect(find.text('전체 만들기'), findsNothing);
diff --git a/test/video_adjust_test.dart b/test/video_adjust_test.dart
index 019f12f..d61f193 100644
--- a/test/video_adjust_test.dart
+++ b/test/video_adjust_test.dart
@@ -31,7 +31,7 @@ void main() {
 
   test('설정 저장: 화면 비율 · 맞추기 · 회전 · 색 보정', () {
     final s = AppSettings()
-      ..encode = const EncodeSettings(
+      ..mkv.encode = const EncodeSettings(
           codec: VideoCodecChoice.h264,
           frame: FrameChoice.square,
           fit: FitChoice.blur,
@@ -40,10 +40,10 @@ void main() {
           contrast: -5,
           saturation: 30,
           temperature: 100);
-    final e = AppSettings.fromJson(s.toJson()).encode;
+    final e = AppSettings.fromJson(s.toJson()).mkv.encode;
     expect([e.frame, e.fit, e.rotate], [FrameChoice.square, FitChoice.blur, RotateChoice.ccw90]);
     expect([e.brightness, e.contrast, e.saturation, e.temperature], [10, -5, 30, 100]);
-    expect(AppSettings.fromJson({'encode': {'saturation': 999}}).encode.saturation, 100);
+    expect(AppSettings.fromJson({'encode': {'saturation': 999}}).mkv.encode.saturation, 100);
   });
 
   // 실제 FFmpeg 로 만들어 보고 출력 크기 확인