feat(export): always export H.264 and drop the codec picker

src/components/ai-edition/ExportDialog.params.test.tsx

@@ -157,8 +157,14 @@ describe("ExportDialog format settings", () => {
 		vi.clearAllMocks();
 	});
 
-	it("opens on MP4, 1080p, 60 fps, H.264", async () => {
+	it("opens on MP4, 1080p, 60 fps, H.264, with no codec choice to make", async () => {
 		renderDialog();
+		// No picker, on purpose: H.265 is software-only on Linux, slower than software on
+		// the measured Macs, and unreadable in half the players. Every export is H.264.
+		expect(screen.queryByRole("button", { name: "H.265" })).toBeNull();
+		expect(screen.queryByRole("button", { name: "H.264" })).toBeNull();
+		// And no idle hint plate: the format is the first control on screen and already picked.
+		expect(screen.queryByText(/pick a format/i)).toBeNull();
 		expect(await exportMp4()).toMatchObject({ width: 1920, height: 1080, fps: 60, codec: "h264" });
 	});
 

src/components/ai-edition/ExportDialog.tsx

@@ -25,7 +25,6 @@ import {
 	type ExportFormat,
 	type ExportProgress,
 	type ExportQuality,
-	type ExportVideoCodec,
 	GIF_FRAME_RATES,
 	GIF_SIZE_PRESETS,
 	type GifFrameRate,
@@ -162,7 +161,6 @@ export function ExportDialog({ open, onClose, document }: ExportDialogProps) {
 	const [format, setFormat] = useState<ExportFormat>("mp4");
 	const [quality, setQuality] = useState<ExportQuality>("good");
 	const [fps, setFps] = useState<24 | 30 | 60>(60);
-	const [codec, setCodec] = useState<ExportVideoCodec>("h264");
 	const [gifFrameRate, setGifFrameRate] = useState<GifFrameRate>(15);
 	const [gifSize, setGifSize] = useState<GifSizePreset>("medium");
 	const [gifLoop, setGifLoop] = useState(true);
@@ -434,7 +432,10 @@ export function ExportDialog({ open, onClose, document }: ExportDialogProps) {
 								width: outDims?.width,
 								height: outDims?.height,
 								fps,
-								codec,
+								// H.264 only. The native pipeline still encodes H.265, but nothing
+								// offers it: it is software-only on Linux, slower than software on the
+								// measured Macs, and the files half the players cannot open.
+								codec: "h264",
 								bitrate: outDims?.bitrate,
 							});
 				if (activeExport.current !== job) return;
@@ -572,65 +573,20 @@ export function ExportDialog({ open, onClose, document }: ExportDialogProps) {
 								</button>
 							))}
 						</div>
-						<div
-							style={{
-								display: "grid",
-								gridTemplateColumns: "1fr 1fr",
-								gap: 12,
-								marginTop: 12,
-							}}
-						>
-							<div>
-								<div className={styles.groupLabel}>{t("exportDialog.frameRate")}</div>
-								<div style={{ display: "grid", gridTemplateColumns: "repeat(3, 1fr)", gap: 6 }}>
-									{([24, 30, 60] as const).map((r) => (
-										<button
-											type="button"
-											key={r}
-											disabled={isBusy}
-											onClick={() => setFps(r)}
-											style={segStyle(fps === r)}
-										>
-											{r}
-										</button>
-									))}
-								</div>
-							</div>
-							<div>
-								<div className={styles.groupLabel}>{t("exportDialog.codec")}</div>
-								<div
-									style={{
-										display: "grid",
-										gridTemplateColumns: "repeat(2, 1fr)",
-										gap: 6,
-									}}
-								>
-									{(
-										[
-											["h264", "H.264"],
-											["h265", "H.265"],
-											// VP9 has no AMF hardware encoder on this GPU — the native pipeline
-											// (the only MP4 export path now) rejects it outright (tested: a
-											// software libvpx-vp9 fallback worked but was too slow to ship).
-											// Hidden here rather than left selectable-then-erroring.
-										] as Array<[ExportVideoCodec, string]>
-									).map(([value, label]) => (
-										<button
-											type="button"
-											key={value}
-											disabled={isBusy}
-											onClick={() => setCodec(value)}
-											style={segStyle(codec === value)}
-											title={
-												value === "h264"
-													? t("exportDialog.codecBestCompatibility")
-													: t("exportDialog.codecMaySupportVary")
-											}
-										>
-											{label}
-										</button>
-									))}
-								</div>
+						<div style={{ marginTop: 12 }}>
+							<div className={styles.groupLabel}>{t("exportDialog.frameRate")}</div>
+							<div style={{ display: "grid", gridTemplateColumns: "repeat(3, 1fr)", gap: 6 }}>
+								{([24, 30, 60] as const).map((r) => (
+									<button
+										type="button"
+										key={r}
+										disabled={isBusy}
+										onClick={() => setFps(r)}
+										style={segStyle(fps === r)}
+									>
+										{r}
+									</button>
+								))}
 							</div>
 						</div>
 					</section>
@@ -838,22 +794,11 @@ function ProgressBlock({
 	// rather than in the orphaned `settings.support` block because the main process only bundles
 	// `common` and `dialogs`, and one label split across two namespaces is one label that drifts.
 	const tCommon = useScopedT("common");
-	if (phase === "idle" || phase === "configuring") {
-		return (
-			<div
-				style={{
-					padding: "16px",
-					borderRadius: 12,
-					background: "color-mix(in oklab, var(--fg) 5%, transparent)",
-					color: "var(--muted)",
-					font: "500 13px var(--font-body)",
-					textAlign: "center",
-				}}
-			>
-				{t("exportDialog.pickFormatAndExport")}
-			</div>
-		);
-	}
+	// Nothing to say before an export: the format is the first control on screen and
+	// already picked. The old "Pick a format and press Export to start" plate was written
+	// for the UI that hid the format toggle under Advanced, and stayed up through the save
+	// picker where it was simply false.
+	if (phase === "idle" || phase === "configuring") return null;
 	if (phase === "done") {
 		return (
 			<div

src/i18n/locales/ar/editor.json

@@ -177,14 +177,10 @@
 		"quality": "الجودة",
 		"qualityMatchRecording": "مطابقة التسجيل",
 		"frameRate": "معدل الإطارات",
-		"codec": "الترميز",
-		"codecBestCompatibility": "أفضل توافق",
-		"codecMaySupportVary": "قد لا يكون مدعومًا من جميع مرمّزات النظام",
 		"size": "الحجم",
 		"loopGif": "تكرار GIF",
 		"loopOn": "التكرار مفعّل",
 		"loopOff": "التكرار معطّل",
-		"pickFormatAndExport": "اختر صيغة واضغط على تصدير للبدء.",
 		"savedTo": "تم الحفظ في",
 		"exportFailedGeneric": "فشل التصدير.",
 		"writingFile": "جارٍ كتابة الملف...",

src/i18n/locales/cs/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Kvalita",
 		"qualityMatchRecording": "Odpovídat nahrávce",
 		"frameRate": "Snímkový kmitočet",
-		"codec": "Kodek",
-		"codecBestCompatibility": "Nejlepší kompatibilita",
-		"codecMaySupportVary": "Nemusí být podporováno každým systémovým enkodérem",
 		"size": "Velikost",
 		"loopGif": "Opakovat GIF",
 		"loopOn": "Opakování zapnuto",
 		"loopOff": "Opakování vypnuto",
-		"pickFormatAndExport": "Vyberte formát a stiskněte Exportovat pro zahájení.",
 		"savedTo": "Uloženo do",
 		"exportFailedGeneric": "Export selhal.",
 		"writingFile": "Zapisování souboru…",

src/i18n/locales/de/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Qualität",
 		"qualityMatchRecording": "Wie die Aufnahme",
 		"frameRate": "Bildrate",
-		"codec": "Codec",
-		"codecBestCompatibility": "Beste Kompatibilität",
-		"codecMaySupportVary": "Wird möglicherweise nicht von jedem System-Encoder unterstützt",
 		"size": "Größe",
 		"loopGif": "GIF wiederholen",
 		"loopOn": "Wiederholung an",
 		"loopOff": "Wiederholung aus",
-		"pickFormatAndExport": "Wähle ein Format und drücke auf Exportieren, um zu starten.",
 		"savedTo": "Gespeichert unter",
 		"exportFailedGeneric": "Export fehlgeschlagen.",
 		"writingFile": "Datei wird geschrieben…",

src/i18n/locales/en/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Quality",
 		"qualityMatchRecording": "Match recording",
 		"frameRate": "Frame rate",
-		"codec": "Codec",
-		"codecBestCompatibility": "Best compatibility",
-		"codecMaySupportVary": "May not be supported by every system encoder",
 		"size": "Size",
 		"loopGif": "Loop GIF",
 		"loopOn": "Loop on",
 		"loopOff": "Loop off",
-		"pickFormatAndExport": "Pick a format and press Export to start.",
 		"savedTo": "Saved to",
 		"exportFailedGeneric": "Export failed.",
 		"writingFile": "Writing file…",

src/i18n/locales/es/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Calidad",
 		"qualityMatchRecording": "Igual que la grabación",
 		"frameRate": "Fotogramas por segundo",
-		"codec": "Códec",
-		"codecBestCompatibility": "Mejor compatibilidad",
-		"codecMaySupportVary": "Puede que no sea compatible con todos los codificadores del sistema",
 		"size": "Tamaño",
 		"loopGif": "Bucle de GIF",
 		"loopOn": "Bucle activado",
 		"loopOff": "Bucle desactivado",
-		"pickFormatAndExport": "Elige un formato y pulsa Exportar para empezar.",
 		"savedTo": "Guardado en",
 		"exportFailedGeneric": "Error al exportar.",
 		"writingFile": "Escribiendo archivo…",

src/i18n/locales/fr/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Qualité",
 		"qualityMatchRecording": "Comme l'enregistrement",
 		"frameRate": "Fréquence d'images",
-		"codec": "Codec",
-		"codecBestCompatibility": "Meilleure compatibilité",
-		"codecMaySupportVary": "Peut ne pas être pris en charge par tous les encodeurs système",
 		"size": "Taille",
 		"loopGif": "Boucle GIF",
 		"loopOn": "Boucle activée",
 		"loopOff": "Boucle désactivée",
-		"pickFormatAndExport": "Choisissez un format et cliquez sur Exporter pour commencer.",
 		"savedTo": "Enregistré dans",
 		"exportFailedGeneric": "Échec de l'export.",
 		"writingFile": "Écriture du fichier…",

src/i18n/locales/it/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Qualità",
 		"qualityMatchRecording": "Come la registrazione",
 		"frameRate": "Frame rate",
-		"codec": "Codec",
-		"codecBestCompatibility": "Compatibilità migliore",
-		"codecMaySupportVary": "Potrebbe non essere supportato da tutti gli encoder di sistema",
 		"size": "Dimensione",
 		"loopGif": "Loop GIF",
 		"loopOn": "Loop attivo",
 		"loopOff": "Loop disattivo",
-		"pickFormatAndExport": "Scegli un formato e premi Esporta per iniziare.",
 		"savedTo": "Salvato in",
 		"exportFailedGeneric": "Esportazione non riuscita.",
 		"writingFile": "Scrittura del file…",

src/i18n/locales/ja-JP/editor.json

@@ -177,14 +177,10 @@
 		"quality": "画質",
 		"qualityMatchRecording": "録画と同じ",
 		"frameRate": "フレームレート",
-		"codec": "コーデック",
-		"codecBestCompatibility": "互換性が最も高い",
-		"codecMaySupportVary": "システムのエンコーダーによってはサポートされない場合があります",
 		"size": "サイズ",
 		"loopGif": "GIFをループ",
 		"loopOn": "ループ オン",
 		"loopOff": "ループ オフ",
-		"pickFormatAndExport": "形式を選択し、エクスポートを押して開始してください。",
 		"savedTo": "保存先",
 		"exportFailedGeneric": "エクスポートに失敗しました。",
 		"writingFile": "ファイルを書き込み中…",

src/i18n/locales/ko-KR/editor.json

@@ -177,14 +177,10 @@
 		"quality": "화질",
 		"qualityMatchRecording": "녹화와 동일",
 		"frameRate": "프레임 속도",
-		"codec": "코덱",
-		"codecBestCompatibility": "호환성이 가장 좋음",
-		"codecMaySupportVary": "시스템 인코더에 따라 지원되지 않을 수 있습니다",
 		"size": "크기",
 		"loopGif": "GIF 반복",
 		"loopOn": "반복 켜짐",
 		"loopOff": "반복 꺼짐",
-		"pickFormatAndExport": "형식을 선택하고 내보내기를 눌러 시작하세요.",
 		"savedTo": "저장 위치",
 		"exportFailedGeneric": "내보내기에 실패했습니다.",
 		"writingFile": "파일 쓰는 중…",

src/i18n/locales/pt-BR/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Qualidade",
 		"qualityMatchRecording": "Igual à gravação",
 		"frameRate": "Taxa de quadros",
-		"codec": "Codec",
-		"codecBestCompatibility": "Melhor compatibilidade",
-		"codecMaySupportVary": "Pode não ser suportado por todos os codificadores do sistema",
 		"size": "Tamanho",
 		"loopGif": "Repetir GIF",
 		"loopOn": "Repetição ativada",
 		"loopOff": "Repetição desativada",
-		"pickFormatAndExport": "Escolha um formato e clique em Exportar para começar.",
 		"savedTo": "Salvo em",
 		"exportFailedGeneric": "Falha na exportação.",
 		"writingFile": "Gravando arquivo…",

src/i18n/locales/ru/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Качество",
 		"qualityMatchRecording": "Как в записи",
 		"frameRate": "Частота кадров",
-		"codec": "Кодек",
-		"codecBestCompatibility": "Лучшая совместимость",
-		"codecMaySupportVary": "Может не поддерживаться некоторыми системными кодировщиками",
 		"size": "Размер",
 		"loopGif": "Зациклить GIF",
 		"loopOn": "Зацикливание включено",
 		"loopOff": "Зацикливание выключено",
-		"pickFormatAndExport": "Выберите формат и нажмите «Экспорт», чтобы начать.",
 		"savedTo": "Сохранено в",
 		"exportFailedGeneric": "Ошибка экспорта.",
 		"writingFile": "Запись файла…",

src/i18n/locales/tr/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Kalite",
 		"qualityMatchRecording": "Kayıtla eşleştir",
 		"frameRate": "Kare hızı",
-		"codec": "Codec",
-		"codecBestCompatibility": "En iyi uyumluluk",
-		"codecMaySupportVary": "Her sistem kodlayıcısı tarafından desteklenmeyebilir",
 		"size": "Boyut",
 		"loopGif": "GIF'i döngüye al",
 		"loopOn": "Döngü açık",
 		"loopOff": "Döngü kapalı",
-		"pickFormatAndExport": "Bir format seçin ve başlamak için Dışa Aktar'a basın.",
 		"savedTo": "Kaydedildiği yer",
 		"exportFailedGeneric": "Dışa aktarma başarısız oldu.",
 		"writingFile": "Dosya yazılıyor…",

src/i18n/locales/vi/editor.json

@@ -177,14 +177,10 @@
 		"quality": "Chất lượng",
 		"qualityMatchRecording": "Khớp với bản ghi",
 		"frameRate": "Tốc độ khung hình",
-		"codec": "Codec",
-		"codecBestCompatibility": "Tương thích tốt nhất",
-		"codecMaySupportVary": "Có thể không được hỗ trợ bởi mọi bộ mã hóa hệ thống",
 		"size": "Kích thước",
 		"loopGif": "Lặp GIF",
 		"loopOn": "Lặp bật",
 		"loopOff": "Lặp tắt",
-		"pickFormatAndExport": "Chọn định dạng và nhấn Xuất để bắt đầu.",
 		"savedTo": "Đã lưu vào",
 		"exportFailedGeneric": "Xuất thất bại.",
 		"writingFile": "Đang ghi tệp…",

src/i18n/locales/zh-CN/editor.json

@@ -177,14 +177,10 @@
 		"quality": "画质",
 		"qualityMatchRecording": "与录制一致",
 		"frameRate": "帧率",
-		"codec": "编码格式",
-		"codecBestCompatibility": "兼容性最佳",
-		"codecMaySupportVary": "并非所有系统编码器都支持",
 		"size": "尺寸",
 		"loopGif": "循环播放 GIF",
 		"loopOn": "循环已开启",
 		"loopOff": "循环已关闭",
-		"pickFormatAndExport": "选择格式并点击导出以开始。",
 		"savedTo": "已保存至",
 		"exportFailedGeneric": "导出失败。",
 		"writingFile": "正在写入文件…",

src/i18n/locales/zh-TW/editor.json

@@ -177,14 +177,10 @@
 		"quality": "畫質",
 		"qualityMatchRecording": "與錄製內容相符",
 		"frameRate": "幀率",
-		"codec": "編碼格式",
-		"codecBestCompatibility": "相容性最佳",
-		"codecMaySupportVary": "並非所有系統編碼器都支援",
 		"size": "尺寸",
 		"loopGif": "循環播放 GIF",
 		"loopOn": "循環開啟",
 		"loopOff": "循環關閉",
-		"pickFormatAndExport": "選擇格式並按下匯出以開始。",
 		"savedTo": "已儲存至",
 		"exportFailedGeneric": "匯出失敗。",
 		"writingFile": "正在寫入檔案…",

technical-documentation/architecture/editor-shell.md

@@ -60,7 +60,7 @@ of those are local React state, with the document itself read through
 | **Floating inspector** | `src/components/ai-edition/v4/FloatingInspector.tsx` | Floating facet rail over the stage; the open panel either shows the `FacetBody` for the current facet (`effects` / `layout` / `audio` / `cursor` / `captions` / `transcript`) or, when a region is selected, a `SelectionPane` (`:434`) that edits the selected pill by id. The "pencil" rail button opens `EditClipModal` for crop + trim. |
 | **Left chat column** (`ChatStripPanel`) | `src/components/ai-edition/LeftPanel.tsx` | Only mounted when `mode === "edit"` and `chatOpen` is true (`NewEditorShell.tsx` `:1191-1195`). Sends user messages to the LLM via IPC. Resize handle is `v4.chatResizeHandle`; width persists in `localStorage` as `os-editor-chat-width`. |
 | **Modals** | `src/components/ai-edition/Modals.tsx` | `OpenProjectModal`, `NewProjectModal`, `EditClipModal` (per-clip crop + in/out), `UnsavedChangesModal`. Mounted at the shell level (`:1333-1385`) so every trigger site reuses the same instance. |
-| **Export dialog** | `src/components/ai-edition/ExportDialog.tsx` | Named destinations (Web / YouTube, Social, Studio, README GIF) that set format / quality / frame-rate / codec / size together, all of which stay under **Advanced**. Both formats go through the native compositor with the same clip list (`resolveVisibleClips`) and scene (`buildSceneDescription`): `exportGifNative` for GIF, `exportMultiNative` for MP4. |
+| **Export dialog** | `src/components/ai-edition/ExportDialog.tsx` | One settings panel — format (MP4 / GIF), quality, frame rate, and the GIF size and loop controls — with no codec choice and no idle hint plate: every MP4 is H.264. Both formats go through the native compositor with the same clip list (`resolveVisibleClips`) and scene (`buildSceneDescription`): `exportGifNative` for GIF, `exportMultiNative` for MP4. |
 | **Captions pane** | `src/components/ai-edition/CaptionsPane.tsx` | Mounted as a facet body from `FloatingInspector.tsx` (`:1062`). Controls caption appearance + translations; the cues themselves are a derived view over `document.transcripts` (see [`src/lib/ai-edition/captions/`](../../src/lib/ai-edition/captions/)). |
 
 ## Modes and facets