[codex] Replace mpv fullscreen toggle with launch mode config (#48)

Co-authored-by: bee <autumn@skerritt.blog>

changes/2026.04.06-mpv-launch-mode.md

@@ -0,0 +1,4 @@
+type: changed
+area: launcher
+
+- Replaced the launcher-only fullscreen toggle with `mpv.launchMode` so SubMiner-managed mpv playback can start in normal, maximized, or fullscreen mode.

config.example.jsonc

@@ -461,10 +461,12 @@
   // ==========================================
   // MPV Launcher
   // Optional mpv.exe override for Windows playback entry points.
+  // Set mpv.launchMode to choose normal, maximized, or fullscreen SubMiner-managed mpv playback.
   // Leave mpv.executablePath blank to auto-discover mpv.exe from SUBMINER_MPV_PATH or PATH.
   // ==========================================
   "mpv": {
-    "executablePath": "" // Optional absolute path to mpv.exe for Windows launch flows. Leave empty to auto-discover from SUBMINER_MPV_PATH or PATH.
+    "executablePath": "", // Optional absolute path to mpv.exe for Windows launch flows. Leave empty to auto-discover from SUBMINER_MPV_PATH or PATH.
+    "launchMode": "normal" // Default window state for SubMiner-managed mpv launches. Values: normal | maximized | fullscreen
   }, // Optional mpv.exe override for Windows playback entry points.
 
   // ==========================================

docs-site/public/config.example.jsonc

@@ -461,10 +461,12 @@
   // ==========================================
   // MPV Launcher
   // Optional mpv.exe override for Windows playback entry points.
+  // Set mpv.launchMode to choose normal, maximized, or fullscreen SubMiner-managed mpv playback.
   // Leave mpv.executablePath blank to auto-discover mpv.exe from SUBMINER_MPV_PATH or PATH.
   // ==========================================
   "mpv": {
-    "executablePath": "" // Optional absolute path to mpv.exe for Windows launch flows. Leave empty to auto-discover from SUBMINER_MPV_PATH or PATH.
+    "executablePath": "", // Optional absolute path to mpv.exe for Windows launch flows. Leave empty to auto-discover from SUBMINER_MPV_PATH or PATH.
+    "launchMode": "normal" // Default window state for SubMiner-managed mpv launches. Values: normal | maximized | fullscreen
   }, // Optional mpv.exe override for Windows playback entry points.
 
   // ==========================================

launcher/commands/playback-command.test.ts

@@ -58,6 +58,7 @@ function createContext(): LauncherCommandContext {
       jellyfinServer: '',
       jellyfinUsername: '',
       jellyfinPassword: '',
+      launchMode: 'normal',
     },
     scriptPath: '/tmp/subminer',
     scriptName: 'subminer',

launcher/config-domain-parsers.test.ts

@@ -2,6 +2,7 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import { parseLauncherYoutubeSubgenConfig } from './config/youtube-subgen-config.js';
 import { parseLauncherJellyfinConfig } from './config/jellyfin-config.js';
+import { parseLauncherMpvConfig } from './config/mpv-config.js';
 import { readExternalYomitanProfilePath } from './config.js';
 import {
   getPluginConfigCandidates,
@@ -80,6 +81,27 @@ test('parseLauncherJellyfinConfig omits legacy token and user id fields', () =>
   assert.equal('userId' in parsed, false);
 });
 
+test('parseLauncherMpvConfig reads launch mode preference', () => {
+  const parsed = parseLauncherMpvConfig({
+    mpv: {
+      launchMode: ' maximized ',
+      executablePath: 'ignored-here',
+    },
+  });
+
+  assert.equal(parsed.launchMode, 'maximized');
+});
+
+test('parseLauncherMpvConfig ignores invalid launch mode values', () => {
+  const parsed = parseLauncherMpvConfig({
+    mpv: {
+      launchMode: 'wide',
+    },
+  });
+
+  assert.equal(parsed.launchMode, undefined);
+});
+
 test('parsePluginRuntimeConfigContent reads socket path and startup gate options', () => {
   const parsed = parsePluginRuntimeConfigContent(`
 # comment

launcher/config.ts

@@ -2,6 +2,7 @@ import { fail } from './log.js';
 import type {
   Args,
   LauncherJellyfinConfig,
+  LauncherMpvConfig,
   LauncherYoutubeSubgenConfig,
   LogLevel,
   PluginRuntimeConfig,
@@ -13,6 +14,7 @@ import {
 } from './config/args-normalizer.js';
 import { parseCliPrograms, resolveTopLevelCommand } from './config/cli-parser-builder.js';
 import { parseLauncherJellyfinConfig } from './config/jellyfin-config.js';
+import { parseLauncherMpvConfig } from './config/mpv-config.js';
 import { readPluginRuntimeConfig as readPluginRuntimeConfigValue } from './config/plugin-runtime-config.js';
 import { readLauncherMainConfigObject } from './config/shared-config-reader.js';
 import { parseLauncherYoutubeSubgenConfig } from './config/youtube-subgen-config.js';
@@ -44,6 +46,12 @@ export function loadLauncherJellyfinConfig(): LauncherJellyfinConfig {
   return parseLauncherJellyfinConfig(root);
 }
 
+export function loadLauncherMpvConfig(): LauncherMpvConfig {
+  const root = readLauncherMainConfigObject();
+  if (!root) return {};
+  return parseLauncherMpvConfig(root);
+}
+
 export function hasLauncherExternalYomitanProfileConfig(): boolean {
   return readExternalYomitanProfilePath(readLauncherMainConfigObject()) !== null;
 }
@@ -56,9 +64,10 @@ export function parseArgs(
   argv: string[],
   scriptName: string,
   launcherConfig: LauncherYoutubeSubgenConfig,
+  launcherMpvConfig: LauncherMpvConfig = {},
 ): Args {
   const topLevelCommand = resolveTopLevelCommand(argv);
-  const parsed = createDefaultArgs(launcherConfig);
+  const parsed = createDefaultArgs(launcherConfig, launcherMpvConfig);
 
   if (topLevelCommand && (topLevelCommand.name === 'app' || topLevelCommand.name === 'bin')) {
     parsed.appPassthrough = true;

launcher/config/args-normalizer.ts

@@ -1,7 +1,13 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import { fail } from '../log.js';
-import type { Args, Backend, LauncherYoutubeSubgenConfig, LogLevel } from '../types.js';
+import type {
+  Args,
+  Backend,
+  LauncherMpvConfig,
+  LauncherYoutubeSubgenConfig,
+  LogLevel,
+} from '../types.js';
 import {
   DEFAULT_JIMAKU_API_BASE_URL,
   DEFAULT_YOUTUBE_PRIMARY_SUB_LANGS,
@@ -83,7 +89,10 @@ function parseDictionaryTarget(value: string): string {
   return resolved;
 }
 
-export function createDefaultArgs(launcherConfig: LauncherYoutubeSubgenConfig): Args {
+export function createDefaultArgs(
+  launcherConfig: LauncherYoutubeSubgenConfig,
+  mpvConfig: LauncherMpvConfig = {},
+): Args {
   const configuredSecondaryLangs = uniqueNormalizedLangCodes(
     launcherConfig.secondarySubLanguages ?? [],
   );
@@ -148,6 +157,7 @@ export function createDefaultArgs(launcherConfig: LauncherYoutubeSubgenConfig):
     jellyfinServer: '',
     jellyfinUsername: '',
     jellyfinPassword: '',
+    launchMode: mpvConfig.launchMode ?? 'normal',
     youtubePrimarySubLangs: primarySubLangs,
     youtubeSecondarySubLangs: secondarySubLangs,
     youtubeAudioLangs,

launcher/config/mpv-config.ts

@@ -0,0 +1,12 @@
+import { parseMpvLaunchMode } from '../../src/shared/mpv-launch-mode.js';
+import type { LauncherMpvConfig } from '../types.js';
+
+export function parseLauncherMpvConfig(root: Record<string, unknown>): LauncherMpvConfig {
+  const mpvRaw = root.mpv;
+  if (!mpvRaw || typeof mpvRaw !== 'object') return {};
+  const mpv = mpvRaw as Record<string, unknown>;
+
+  return {
+    launchMode: parseMpvLaunchMode(mpv.launchMode),
+  };
+}

launcher/main.ts

@@ -1,6 +1,7 @@
 import path from 'node:path';
 import {
   loadLauncherJellyfinConfig,
+  loadLauncherMpvConfig,
   loadLauncherYoutubeSubgenConfig,
   parseArgs,
   readPluginRuntimeConfig,
@@ -52,7 +53,8 @@ async function main(): Promise<void> {
   const scriptPath = process.argv[1] || 'subminer';
   const scriptName = path.basename(scriptPath);
   const launcherConfig = loadLauncherYoutubeSubgenConfig();
-  const args = parseArgs(process.argv.slice(2), scriptName, launcherConfig);
+  const launcherMpvConfig = loadLauncherMpvConfig();
+  const args = parseArgs(process.argv.slice(2), scriptName, launcherConfig, launcherMpvConfig);
   const pluginRuntimeConfig = readPluginRuntimeConfig(args.logLevel);
   const appPath = findAppBinary(scriptPath);
 

launcher/mpv.test.ts

@@ -7,6 +7,7 @@ import net from 'node:net';
 import { EventEmitter } from 'node:events';
 import type { Args } from './types';
 import {
+  buildConfiguredMpvDefaultArgs,
   buildMpvBackendArgs,
   buildMpvEnv,
   cleanupPlaybackSession,
@@ -234,6 +235,33 @@ test('buildMpvBackendArgs keeps supported Hyprland and Sway auto backends unchan
   });
 });
 
+test('buildConfiguredMpvDefaultArgs appends maximized launch mode to configured defaults', () => {
+  withPlatform('linux', () => {
+    assert.deepEqual(
+      buildConfiguredMpvDefaultArgs(makeArgs({ launchMode: 'maximized' }), {
+        DISPLAY: ':1',
+        WAYLAND_DISPLAY: 'wayland-0',
+        XDG_SESSION_TYPE: 'wayland',
+        XDG_CURRENT_DESKTOP: 'KDE',
+        XDG_SESSION_DESKTOP: 'plasma',
+      }),
+      [
+        '--sub-auto=fuzzy',
+        '--sub-file-paths=.;subs;subtitles',
+        '--sid=auto',
+        '--secondary-sid=auto',
+        '--secondary-sub-visibility=no',
+        '--alang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+        '--slang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+        '--vo=gpu',
+        '--gpu-api=opengl',
+        '--gpu-context=x11egl,x11',
+        '--window-maximized=yes',
+      ],
+    );
+  });
+});
+
 test('launchTexthookerOnly exits non-zero when app binary cannot be spawned', () => {
   const error = withProcessExitIntercept(() => {
     launchTexthookerOnly('/definitely-missing-subminer-binary', makeArgs());
@@ -401,6 +429,7 @@ function makeArgs(overrides: Partial<Args> = {}): Args {
     jellyfinServer: '',
     jellyfinUsername: '',
     jellyfinPassword: '',
+    launchMode: 'normal',
     ...overrides,
   };
 }

launcher/mpv.ts

@@ -3,6 +3,7 @@ import path from 'node:path';
 import os from 'node:os';
 import net from 'node:net';
 import { spawn, spawnSync } from 'node:child_process';
+import { buildMpvLaunchModeArgs } from '../src/shared/mpv-launch-mode.js';
 import type { LogLevel, Backend, Args, MpvTrack } from './types.js';
 import { DEFAULT_MPV_SUBMINER_ARGS, DEFAULT_YOUTUBE_YTDL_FORMAT } from './types.js';
 import { appendToAppLog, getAppLogPath, log, fail, getMpvLogPath } from './log.js';
@@ -673,9 +674,7 @@ export async function startMpv(
   }
 
   const mpvArgs: string[] = [];
-  if (args.profile) mpvArgs.push(`--profile=${args.profile}`);
+  mpvArgs.push(...buildConfiguredMpvDefaultArgs(args));
-  mpvArgs.push(...DEFAULT_MPV_SUBMINER_ARGS);
-  mpvArgs.push(...buildMpvBackendArgs(args));
   if (targetKind === 'url' && isYoutubeTarget(target)) {
     log('info', args.logLevel, 'Applying URL playback options');
     mpvArgs.push('--ytdl=yes');
@@ -703,7 +702,6 @@ export async function startMpv(
   if (args.mpvArgs) {
     mpvArgs.push(...parseMpvArgString(args.mpvArgs));
   }
-
   if (preloadedSubtitles?.primaryPath) {
     mpvArgs.push(`--sub-file=${preloadedSubtitles.primaryPath}`);
   }
@@ -979,6 +977,18 @@ export function buildMpvBackendArgs(
   return ['--vo=gpu', '--gpu-api=opengl', '--gpu-context=x11egl,x11'];
 }
 
+export function buildConfiguredMpvDefaultArgs(
+  args: Pick<Args, 'profile' | 'backend' | 'launchMode'>,
+  baseEnv: NodeJS.ProcessEnv = process.env,
+): string[] {
+  const mpvArgs: string[] = [];
+  if (args.profile) mpvArgs.push(`--profile=${args.profile}`);
+  mpvArgs.push(...DEFAULT_MPV_SUBMINER_ARGS);
+  mpvArgs.push(...buildMpvBackendArgs(args, baseEnv));
+  mpvArgs.push(...buildMpvLaunchModeArgs(args.launchMode));
+  return mpvArgs;
+}
+
 function appendCapturedAppOutput(kind: 'STDOUT' | 'STDERR', chunk: string): void {
   const normalized = chunk.replace(/\r\n/g, '\n');
   for (const line of normalized.split('\n')) {
@@ -1209,10 +1219,7 @@ export function launchMpvIdleDetached(
       // ignore
     }
 
-    const mpvArgs: string[] = [];
+    const mpvArgs: string[] = buildConfiguredMpvDefaultArgs(args);
-    if (args.profile) mpvArgs.push(`--profile=${args.profile}`);
-    mpvArgs.push(...DEFAULT_MPV_SUBMINER_ARGS);
-    mpvArgs.push(...buildMpvBackendArgs(args));
     if (args.mpvArgs) {
       mpvArgs.push(...parseMpvArgString(args.mpvArgs));
     }

launcher/parse-args.test.ts

@@ -85,6 +85,12 @@ test('parseArgs maps mpv idle action', () => {
   assert.equal(parsed.mpvStatus, false);
 });
 
+test('parseArgs applies configured mpv launch mode default', () => {
+  const parsed = parseArgs([], 'subminer', {}, { launchMode: 'maximized' });
+
+  assert.equal(parsed.launchMode, 'maximized');
+});
+
 test('parseArgs maps dictionary command and log-level override', () => {
   const parsed = parseArgs(['dictionary', '.', '--log-level', 'debug'], 'subminer', {});
 

launcher/types.ts

@@ -1,5 +1,6 @@
 import path from 'node:path';
 import os from 'node:os';
+import type { MpvLaunchMode } from '../src/types/config.js';
 import { resolveDefaultLogFilePath } from '../src/shared/log-files.js';
 export { VIDEO_EXTENSIONS } from '../src/shared/video-extensions.js';
 
@@ -140,6 +141,7 @@ export interface Args {
   jellyfinServer: string;
   jellyfinUsername: string;
   jellyfinPassword: string;
+  launchMode: MpvLaunchMode;
 }
 
 export interface LauncherYoutubeSubgenConfig {
@@ -167,6 +169,10 @@ export interface LauncherJellyfinConfig {
   iconCacheDir?: string;
 }
 
+export interface LauncherMpvConfig {
+  launchMode?: MpvLaunchMode;
+}
+
 export interface PluginRuntimeConfig {
   socketPath: string;
   autoStart: boolean;

src/config/definitions/defaults-integrations.ts

@@ -93,6 +93,7 @@ export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
   },
   mpv: {
     executablePath: '',
+    launchMode: 'normal',
   },
   anilist: {
     enabled: false,

src/config/definitions/domain-registry.test.ts

@@ -29,6 +29,7 @@ test('config option registry includes critical paths and has unique entries', ()
     'anilist.characterDictionary.enabled',
     'anilist.characterDictionary.collapsibleSections.description',
     'mpv.executablePath',
+    'mpv.launchMode',
     'yomitan.externalProfilePath',
     'immersionTracking.enabled',
   ]) {

src/config/definitions/options-integrations.ts

@@ -1,4 +1,5 @@
 import { ResolvedConfig } from '../../types/config';
+import { MPV_LAUNCH_MODE_VALUES } from '../../shared/mpv-launch-mode';
 import { ConfigOptionRegistryEntry, RuntimeOptionRegistryEntry } from './shared';
 
 export function buildIntegrationConfigOptionRegistry(
@@ -245,6 +246,14 @@ export function buildIntegrationConfigOptionRegistry(
       description:
         'Optional absolute path to mpv.exe for Windows launch flows. Leave empty to auto-discover from SUBMINER_MPV_PATH or PATH.',
     },
+    {
+      path: 'mpv.launchMode',
+      kind: 'enum',
+      enumValues: MPV_LAUNCH_MODE_VALUES,
+      defaultValue: defaultConfig.mpv.launchMode,
+      description:
+        'Default window state for SubMiner-managed mpv launches.',
+    },
     {
       path: 'jellyfin.enabled',
       kind: 'boolean',

src/config/definitions/template-sections.ts

@@ -159,6 +159,7 @@ const INTEGRATION_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
     title: 'MPV Launcher',
     description: [
       'Optional mpv.exe override for Windows playback entry points.',
+      'Set mpv.launchMode to choose normal, maximized, or fullscreen SubMiner-managed mpv playback.',
       'Leave mpv.executablePath blank to auto-discover mpv.exe from SUBMINER_MPV_PATH or PATH.',
     ],
     key: 'mpv',

src/config/resolve/integrations.test.ts

@@ -13,6 +13,17 @@ test('resolveConfig trims configured mpv executable path', () => {
   assert.deepEqual(warnings, []);
 });
 
+test('resolveConfig parses configured mpv launch mode', () => {
+  const { resolved, warnings } = resolveConfig({
+    mpv: {
+      launchMode: 'maximized',
+    },
+  });
+
+  assert.equal(resolved.mpv.launchMode, 'maximized');
+  assert.deepEqual(warnings, []);
+});
+
 test('resolveConfig warns for invalid mpv executable path type', () => {
   const { resolved, warnings } = resolveConfig({
     mpv: {
@@ -29,3 +40,20 @@ test('resolveConfig warns for invalid mpv executable path type', () => {
     message: 'Expected string.',
   });
 });
+
+test('resolveConfig warns for invalid mpv launch mode', () => {
+  const { resolved, warnings } = resolveConfig({
+    mpv: {
+      launchMode: 'cinema' as never,
+    },
+  });
+
+  assert.equal(resolved.mpv.launchMode, 'normal');
+  assert.equal(warnings.length, 1);
+  assert.deepEqual(warnings[0], {
+    path: 'mpv.launchMode',
+    value: 'cinema',
+    fallback: 'normal',
+    message: "Expected one of: 'normal', 'maximized', 'fullscreen'.",
+  });
+});

src/config/resolve/integrations.ts

@@ -1,5 +1,6 @@
 import * as os from 'node:os';
 import * as path from 'node:path';
+import { MPV_LAUNCH_MODE_VALUES, parseMpvLaunchMode } from '../../shared/mpv-launch-mode';
 import { ResolveContext } from './context';
 import { asBoolean, asNumber, asString, isObject } from './shared';
 
@@ -240,6 +241,18 @@ export function applyIntegrationConfig(context: ResolveContext): void {
         'Expected string.',
       );
     }
+
+    const launchMode = parseMpvLaunchMode(src.mpv.launchMode);
+    if (launchMode !== undefined) {
+      resolved.mpv.launchMode = launchMode;
+    } else if (src.mpv.launchMode !== undefined) {
+      warn(
+        'mpv.launchMode',
+        src.mpv.launchMode,
+        resolved.mpv.launchMode,
+        `Expected one of: ${MPV_LAUNCH_MODE_VALUES.map((value) => `'${value}'`).join(', ')}.`,
+      );
+    }
   } else if (src.mpv !== undefined) {
     warn('mpv', src.mpv, resolved.mpv, 'Expected object.');
   }

src/main-entry.ts

@@ -20,6 +20,7 @@ import {
 import { requestSingleInstanceLockEarly } from './main/early-single-instance';
 import { resolvePackagedFirstRunPluginAssets } from './main/runtime/first-run-setup-plugin';
 import { createWindowsMpvLaunchDeps, launchWindowsMpv } from './main/runtime/windows-mpv-launch';
+import { parseMpvLaunchMode } from './shared/mpv-launch-mode';
 import { runStatsDaemonControlFromProcess } from './stats-daemon-entry';
 
 const DEFAULT_TEXTHOOKER_PORT = 5174;
@@ -36,21 +37,6 @@ function applySanitizedEnv(sanitizedEnv: NodeJS.ProcessEnv): void {
   }
 }
 
-function readConfiguredWindowsMpvExecutablePath(configDir: string): string {
-  const loadResult = loadRawConfigStrict({
-    configDir,
-    configFileJsonc: path.join(configDir, 'config.jsonc'),
-    configFileJson: path.join(configDir, 'config.json'),
-  });
-  if (!loadResult.ok) {
-    return '';
-  }
-
-  return typeof loadResult.config.mpv?.executablePath === 'string'
-    ? loadResult.config.mpv.executablePath.trim()
-    : '';
-}
-
 function resolveBundledWindowsMpvPluginEntrypoint(): string | undefined {
   const assets = resolvePackagedFirstRunPluginAssets({
     dirname: __dirname,
@@ -64,6 +50,31 @@ function resolveBundledWindowsMpvPluginEntrypoint(): string | undefined {
   return path.join(assets.pluginDirSource, 'main.lua');
 }
 
+function readConfiguredWindowsMpvLaunch(configDir: string): {
+  executablePath: string;
+  launchMode: 'normal' | 'maximized' | 'fullscreen';
+} {
+  const loadResult = loadRawConfigStrict({
+    configDir,
+    configFileJsonc: path.join(configDir, 'config.jsonc'),
+    configFileJson: path.join(configDir, 'config.json'),
+  });
+  if (!loadResult.ok) {
+    return {
+      executablePath: '',
+      launchMode: 'normal',
+    };
+  }
+
+  return {
+    executablePath:
+      typeof loadResult.config.mpv?.executablePath === 'string'
+        ? loadResult.config.mpv.executablePath.trim()
+        : '',
+    launchMode: parseMpvLaunchMode(loadResult.config.mpv?.launchMode) ?? 'normal',
+  };
+}
+
 process.argv = normalizeStartupArgv(process.argv, process.env);
 applySanitizedEnv(sanitizeStartupEnv(process.env));
 const userDataPath = configureEarlyAppPaths(app);
@@ -92,6 +103,7 @@ if (shouldHandleLaunchMpvAtEntry(process.argv, process.env)) {
   const sanitizedEnv = sanitizeLaunchMpvEnv(process.env);
   applySanitizedEnv(sanitizedEnv);
   void app.whenReady().then(async () => {
+    const configuredMpvLaunch = readConfiguredWindowsMpvLaunch(userDataPath);
     const result = await launchWindowsMpv(
       normalizeLaunchMpvTargets(process.argv),
       createWindowsMpvLaunchDeps({
@@ -103,7 +115,8 @@ if (shouldHandleLaunchMpvAtEntry(process.argv, process.env)) {
       normalizeLaunchMpvExtraArgs(process.argv),
       process.execPath,
       resolveBundledWindowsMpvPluginEntrypoint(),
-      readConfiguredWindowsMpvExecutablePath(userDataPath),
+      configuredMpvLaunch.executablePath,
+      configuredMpvLaunch.launchMode,
     );
     app.exit(result.ok ? 0 : 1);
   });

src/main.ts

@@ -1052,6 +1052,7 @@ const youtubePlaybackRuntime = createYoutubePlaybackRuntime({
       undefined,
       undefined,
       getResolvedConfig().mpv.executablePath,
+      getResolvedConfig().mpv.launchMode,
     ),
   waitForYoutubeMpvConnected: (timeoutMs) => waitForYoutubeMpvConnected(timeoutMs),
   prepareYoutubePlaybackInMpv: (request) => prepareYoutubePlaybackInMpv(request),
@@ -2031,6 +2032,7 @@ const {
   },
   launchMpvIdleForJellyfinPlaybackMainDeps: {
     getSocketPath: () => appState.mpvSocketPath,
+    getLaunchMode: () => getResolvedConfig().mpv.launchMode,
     platform: process.platform,
     execPath: process.execPath,
     defaultMpvLogPath: DEFAULT_MPV_LOG_PATH,

src/main/runtime/composers/jellyfin-runtime-composer.test.ts

@@ -26,6 +26,7 @@ test('composeJellyfinRuntimeHandlers returns callable jellyfin runtime handlers'
     },
     launchMpvIdleForJellyfinPlaybackMainDeps: {
       getSocketPath: () => '/tmp/test-mpv.sock',
+      getLaunchMode: () => 'normal',
       platform: 'linux',
       execPath: process.execPath,
       defaultMpvLogPath: '/tmp/test-mpv.log',

src/main/runtime/jellyfin-remote-connection-main-deps.test.ts

@@ -33,6 +33,7 @@ test('launch mpv for jellyfin main deps builder maps callbacks', () => {
   };
   const deps = createBuildLaunchMpvIdleForJellyfinPlaybackMainDepsHandler({
     getSocketPath: () => '/tmp/mpv.sock',
+    getLaunchMode: () => 'fullscreen',
     platform: 'darwin',
     execPath: '/tmp/subminer',
     defaultMpvLogPath: '/tmp/mpv.log',
@@ -47,6 +48,7 @@ test('launch mpv for jellyfin main deps builder maps callbacks', () => {
   })();
 
   assert.equal(deps.getSocketPath(), '/tmp/mpv.sock');
+  assert.equal(deps.getLaunchMode(), 'fullscreen');
   assert.equal(deps.platform, 'darwin');
   assert.equal(deps.execPath, '/tmp/subminer');
   assert.equal(deps.defaultMpvLogPath, '/tmp/mpv.log');

src/main/runtime/jellyfin-remote-connection-main-deps.ts

@@ -17,6 +17,7 @@ export function createBuildLaunchMpvIdleForJellyfinPlaybackMainDepsHandler(
 ) {
   return (): LaunchMpvForJellyfinDeps => ({
     getSocketPath: () => deps.getSocketPath(),
+    getLaunchMode: () => deps.getLaunchMode(),
     platform: deps.platform,
     execPath: deps.execPath,
     defaultMpvLogPath: deps.defaultMpvLogPath,

src/main/runtime/jellyfin-remote-connection.test.ts

@@ -31,6 +31,7 @@ test('createLaunchMpvIdleForJellyfinPlaybackHandler builds expected mpv args', (
   const logs: string[] = [];
   const launch = createLaunchMpvIdleForJellyfinPlaybackHandler({
     getSocketPath: () => '/tmp/subminer.sock',
+    getLaunchMode: () => 'maximized',
     platform: 'darwin',
     execPath: '/Applications/SubMiner.app/Contents/MacOS/SubMiner',
     defaultMpvLogPath: '/tmp/mp.log',
@@ -49,6 +50,7 @@ test('createLaunchMpvIdleForJellyfinPlaybackHandler builds expected mpv args', (
 
   launch();
   assert.equal(spawnedArgs.length, 1);
+  assert.ok(spawnedArgs[0]!.includes('--window-maximized=yes'));
   assert.ok(spawnedArgs[0]!.includes('--idle=yes'));
   assert.ok(spawnedArgs[0]!.some((arg) => arg.includes('--input-ipc-server=/tmp/subminer.sock')));
   assert.ok(logs.some((entry) => entry.includes('Launched mpv for Jellyfin playback')));

src/main/runtime/jellyfin-remote-connection.ts

@@ -1,3 +1,6 @@
+import { buildMpvLaunchModeArgs } from '../../shared/mpv-launch-mode';
+import type { MpvLaunchMode } from '../../types/config';
+
 type MpvClientLike = {
   connected: boolean;
   connect: () => void;
@@ -34,6 +37,7 @@ export function createWaitForMpvConnectedHandler(deps: WaitForMpvConnectedDeps)
 
 export type LaunchMpvForJellyfinDeps = {
   getSocketPath: () => string;
+  getLaunchMode: () => MpvLaunchMode;
   platform: NodeJS.Platform;
   execPath: string;
   defaultMpvLogPath: string;
@@ -58,6 +62,7 @@ export function createLaunchMpvIdleForJellyfinPlaybackHandler(deps: LaunchMpvFor
     const scriptOpts = `--script-opts=subminer-binary_path=${deps.execPath},subminer-socket_path=${socketPath}`;
     const mpvArgs = [
       ...deps.defaultMpvArgs,
+      ...buildMpvLaunchModeArgs(deps.getLaunchMode()),
       '--idle=yes',
       scriptOpts,
       `--log-file=${deps.defaultMpvLogPath}`,

src/main/runtime/windows-mpv-launch.test.ts

@@ -80,6 +80,35 @@ test('buildWindowsMpvLaunchArgs uses explicit SubMiner defaults and targets', ()
   );
 });
 
+test('buildWindowsMpvLaunchArgs inserts maximized launch mode before explicit extra args when configured', () => {
+  assert.deepEqual(
+    buildWindowsMpvLaunchArgs(
+      ['C:\\video.mkv'],
+      ['--window-maximized=no'],
+      'C:\\SubMiner\\SubMiner.exe',
+      'C:\\Program Files\\SubMiner\\resources\\plugin\\subminer\\main.lua',
+      'maximized',
+    ),
+    [
+      '--player-operation-mode=pseudo-gui',
+      '--force-window=immediate',
+      '--script=C:\\Program Files\\SubMiner\\resources\\plugin\\subminer\\main.lua',
+      '--input-ipc-server=\\\\.\\pipe\\subminer-socket',
+      '--alang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+      '--slang=ja,jp,jpn,japanese,en,eng,english,enus,en-us',
+      '--sub-auto=fuzzy',
+      '--sub-file-paths=subs;subtitles',
+      '--sid=auto',
+      '--secondary-sid=auto',
+      '--secondary-sub-visibility=no',
+      '--script-opts=subminer-binary_path=C:\\SubMiner\\SubMiner.exe,subminer-socket_path=\\\\.\\pipe\\subminer-socket',
+      '--window-maximized=yes',
+      '--window-maximized=no',
+      'C:\\video.mkv',
+    ],
+  );
+});
+
 test('buildWindowsMpvLaunchArgs keeps shortcut-only launches in idle mode', () => {
   assert.deepEqual(
     buildWindowsMpvLaunchArgs(

src/main/runtime/windows-mpv-launch.ts

@@ -1,5 +1,7 @@
 import fs from 'node:fs';
 import { spawn, spawnSync } from 'node:child_process';
+import { buildMpvLaunchModeArgs } from '../../shared/mpv-launch-mode';
+import type { MpvLaunchMode } from '../../types/config';
 
 export interface WindowsMpvLaunchDeps {
   getEnv: (name: string) => string | undefined;
@@ -89,6 +91,7 @@ export function buildWindowsMpvLaunchArgs(
   extraArgs: string[] = [],
   binaryPath?: string,
   pluginEntrypointPath?: string,
+  launchMode: MpvLaunchMode = 'normal',
 ): string[] {
   const launchIdle = targets.length === 0;
   const inputIpcServer =
@@ -119,6 +122,7 @@ export function buildWindowsMpvLaunchArgs(
     '--secondary-sid=auto',
     '--secondary-sub-visibility=no',
     ...(scriptOpts ? [scriptOpts] : []),
+    ...buildMpvLaunchModeArgs(launchMode),
     ...extraArgs,
     ...targets,
   ];
@@ -131,6 +135,7 @@ export async function launchWindowsMpv(
   binaryPath?: string,
   pluginEntrypointPath?: string,
   configuredMpvPath?: string,
+  launchMode: MpvLaunchMode = 'normal',
 ): Promise<{ ok: boolean; mpvPath: string }> {
   const normalizedConfiguredPath = normalizeCandidate(configuredMpvPath);
   const mpvPath = resolveWindowsMpvPath(deps, normalizedConfiguredPath);
@@ -147,7 +152,13 @@ export async function launchWindowsMpv(
   try {
     await deps.spawnDetached(
       mpvPath,
-      buildWindowsMpvLaunchArgs(targets, extraArgs, binaryPath, pluginEntrypointPath),
+      buildWindowsMpvLaunchArgs(
+        targets,
+        extraArgs,
+        binaryPath,
+        pluginEntrypointPath,
+        launchMode,
+      ),
     );
     return { ok: true, mpvPath };
   } catch (error) {

src/shared/mpv-launch-mode.test.ts

@@ -0,0 +1,15 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { buildMpvLaunchModeArgs, parseMpvLaunchMode } from './mpv-launch-mode';
+
+test('parseMpvLaunchMode normalizes valid string values', () => {
+  assert.equal(parseMpvLaunchMode(' fullscreen '), 'fullscreen');
+  assert.equal(parseMpvLaunchMode('MAXIMIZED'), 'maximized');
+  assert.equal(parseMpvLaunchMode('normal'), 'normal');
+});
+
+test('buildMpvLaunchModeArgs returns the expected mpv flags', () => {
+  assert.deepEqual(buildMpvLaunchModeArgs('normal'), []);
+  assert.deepEqual(buildMpvLaunchModeArgs('maximized'), ['--window-maximized=yes']);
+  assert.deepEqual(buildMpvLaunchModeArgs('fullscreen'), ['--fullscreen']);
+});

src/shared/mpv-launch-mode.ts

@@ -0,0 +1,24 @@
+import type { MpvLaunchMode } from '../types/config';
+
+export const MPV_LAUNCH_MODE_VALUES = ['normal', 'maximized', 'fullscreen'] as const satisfies
+  readonly MpvLaunchMode[];
+
+export function parseMpvLaunchMode(value: unknown): MpvLaunchMode | undefined {
+  if (typeof value !== 'string') {
+    return undefined;
+  }
+
+  const normalized = value.trim().toLowerCase();
+  return MPV_LAUNCH_MODE_VALUES.find((candidate) => candidate === normalized);
+}
+
+export function buildMpvLaunchModeArgs(launchMode: MpvLaunchMode): string[] {
+  switch (launchMode) {
+    case 'fullscreen':
+      return ['--fullscreen'];
+    case 'maximized':
+      return ['--window-maximized=yes'];
+    default:
+      return [];
+  }
+}

src/types/config.ts

@@ -50,8 +50,11 @@ export interface TexthookerConfig {
   openBrowser?: boolean;
 }
 
+export type MpvLaunchMode = 'normal' | 'maximized' | 'fullscreen';
+
 export interface MpvConfig {
   executablePath?: string;
+  launchMode?: MpvLaunchMode;
 }
 
 export type SubsyncMode = 'auto' | 'manual';
@@ -129,6 +132,7 @@ export interface ResolvedConfig {
   texthooker: Required<TexthookerConfig>;
   mpv: {
     executablePath: string;
+    launchMode: MpvLaunchMode;
   };
   controller: {
     enabled: boolean;