diff --git a/src/lib/exporter/finalizationTimeout.test.ts b/src/lib/exporter/finalizationTimeout.test.ts
index 107d709f..ccc53ffe 100644
--- a/src/lib/exporter/finalizationTimeout.test.ts
+++ b/src/lib/exporter/finalizationTimeout.test.ts
@@ -1,8 +1,10 @@
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 
 import {
+	type FinalizationProgressWatchdog,
 	getExportFinalizationIdleTimeoutMs,
 	getExportFinalizationTimeoutMs,
+	withFinalizationTimeout,
 } from "./finalizationTimeout";
 
 describe("finalizationTimeout", () => {
@@ -73,5 +75,89 @@ describe("finalizationTimeout", () => {
 				effectiveDurationSec: 2_700,
 			}),
 		).toBe(300_000);
+		expect(
+			getExportFinalizationIdleTimeoutMs({
+				workload: "audio",
+				effectiveDurationSec: 0,
+			}),
+		).toBe(150_000);
+		expect(
+			getExportFinalizationIdleTimeoutMs({
+				workload: "audio",
+				effectiveDurationSec: Number.NaN,
+			}),
+		).toBe(150_000);
+	});
+
+	it("rejects when a progress-aware finalization stage stops reporting progress", async () => {
+		vi.useFakeTimers();
+
+		try {
+			const idleTimeoutMs = getExportFinalizationIdleTimeoutMs({
+				workload: "audio",
+				effectiveDurationSec: 1_200,
+			});
+
+			const pendingStage = withFinalizationTimeout({
+				promise: new Promise<never>(() => {}),
+				stage: "audio processing",
+				workload: "audio",
+				effectiveDurationSec: 1_200,
+				progressAware: true,
+			});
+
+			const rejection = pendingStage.then(
+				() => null,
+				(error) => (error instanceof Error ? error.message : String(error)),
+			);
+
+			await vi.advanceTimersByTimeAsync(idleTimeoutMs + 1);
+
+			await expect(rejection).resolves.toContain("without observable progress");
+		} finally {
+			vi.useRealTimers();
+		}
+	});
+
+	it("resets the idle watchdog when finalization progress continues", async () => {
+		vi.useFakeTimers();
+
+		try {
+			const idleTimeoutMs = getExportFinalizationIdleTimeoutMs({
+				workload: "audio",
+				effectiveDurationSec: 1_200,
+			});
+			let watchdog: FinalizationProgressWatchdog | null = null;
+			const pendingStage = withFinalizationTimeout({
+				promise: new Promise<never>(() => {}),
+				stage: "audio processing",
+				workload: "audio",
+				effectiveDurationSec: 1_200,
+				progressAware: true,
+				onWatchdogChanged: (nextWatchdog) => {
+					watchdog = nextWatchdog;
+				},
+			});
+			const rejection = pendingStage.then(
+				() => null,
+				(error) => (error instanceof Error ? error.message : String(error)),
+			);
+
+			await vi.advanceTimersByTimeAsync(idleTimeoutMs - 1_000);
+			expect(watchdog).not.toBeNull();
+
+			watchdog?.refreshProgress();
+			await vi.advanceTimersByTimeAsync(idleTimeoutMs - 1_000);
+
+			const pendingSentinel = Symbol("pending");
+			await expect(Promise.race([rejection, Promise.resolve(pendingSentinel)])).resolves.toBe(
+				pendingSentinel,
+			);
+
+			await vi.advanceTimersByTimeAsync(1_001);
+			await expect(rejection).resolves.toContain("without observable progress");
+		} finally {
+			vi.useRealTimers();
+		}
 	});
 });
diff --git a/src/lib/exporter/finalizationTimeout.ts b/src/lib/exporter/finalizationTimeout.ts
index 69ed6d0d..b098e411 100644
--- a/src/lib/exporter/finalizationTimeout.ts
+++ b/src/lib/exporter/finalizationTimeout.ts
@@ -1,4 +1,7 @@
 export type FinalizationTimeoutWorkload = "default" | "audio";
+export type FinalizationProgressWatchdog = {
+	refreshProgress: () => void;
+};
 
 const BASE_FINALIZATION_TIMEOUT_MS = 10 * 60_000;
 const AUDIO_TIMEOUT_HEADROOM_PER_OUTPUT_SECOND_MS = 500;
@@ -53,3 +56,77 @@ export function getExportFinalizationIdleTimeoutMs({
 		MAX_PROGRESS_IDLE_TIMEOUT_MS,
 	);
 }
+
+export async function withFinalizationTimeout<T>({
+	promise,
+	stage,
+	effectiveDurationSec,
+	workload = "default",
+	progressAware = false,
+	onWatchdogChanged,
+}: {
+	promise: Promise<T>;
+	stage: string;
+	effectiveDurationSec?: number | null;
+	workload?: FinalizationTimeoutWorkload;
+	progressAware?: boolean;
+	onWatchdogChanged?: (watchdog: FinalizationProgressWatchdog | null) => void;
+}): Promise<T> {
+	let timeoutId: ReturnType<typeof setTimeout> | null = null;
+	let idleTimeoutId: ReturnType<typeof setTimeout> | null = null;
+	const timeoutMs = getExportFinalizationTimeoutMs({
+		effectiveDurationSec,
+		workload,
+	});
+	const idleTimeoutMs = progressAware
+		? getExportFinalizationIdleTimeoutMs({
+				effectiveDurationSec,
+				workload,
+			})
+		: null;
+	const watchdog: FinalizationProgressWatchdog | null =
+		progressAware && idleTimeoutMs !== null && idleTimeoutMs !== undefined
+			? {
+					refreshProgress: () => undefined,
+				}
+			: null;
+
+	try {
+		return await Promise.race([
+			promise,
+			new Promise<T>((_, reject) => {
+				const rejectWithMessage = (message: string) => {
+					reject(new Error(message));
+				};
+				if (watchdog && idleTimeoutMs !== null) {
+					const refreshProgress = () => {
+						if (idleTimeoutId) {
+							clearTimeout(idleTimeoutId);
+						}
+						idleTimeoutId = setTimeout(() => {
+							rejectWithMessage(
+								`Export timed out during ${stage} after ${Math.ceil(idleTimeoutMs / 1000)} seconds without observable progress`,
+							);
+						}, idleTimeoutMs);
+					};
+					watchdog.refreshProgress = refreshProgress;
+					onWatchdogChanged?.(watchdog);
+					refreshProgress();
+				}
+				timeoutId = setTimeout(() => {
+					rejectWithMessage(
+						`Export timed out during ${stage} after ${Math.ceil(timeoutMs / 60_000)} minutes`,
+					);
+				}, timeoutMs);
+			}),
+		]);
+	} finally {
+		if (timeoutId) {
+			clearTimeout(timeoutId);
+		}
+		if (idleTimeoutId) {
+			clearTimeout(idleTimeoutId);
+		}
+		onWatchdogChanged?.(null);
+	}
+}
diff --git a/src/lib/exporter/modernVideoExporter.ts b/src/lib/exporter/modernVideoExporter.ts
index 330cefcb..bc76be17 100644
--- a/src/lib/exporter/modernVideoExporter.ts
+++ b/src/lib/exporter/modernVideoExporter.ts
@@ -23,9 +23,9 @@ import {
 	getWebCodecsKeyFrameInterval,
 } from "./exportTuning";
 import {
+	type FinalizationProgressWatchdog,
 	type FinalizationTimeoutWorkload,
-	getExportFinalizationIdleTimeoutMs,
-	getExportFinalizationTimeoutMs,
+	withFinalizationTimeout,
 } from "./finalizationTimeout";
 import { FrameRenderer as ModernFrameRenderer } from "./modernFrameRenderer";
 import {
@@ -154,7 +154,7 @@ export class ModernVideoExporter {
 	private nativeWriteTimeMs = 0;
 	private finalizationTimeMs = 0;
 	private processedFrameCount = 0;
-	private activeFinalizationProgressWatchdog: { refreshProgress: () => void } | null = null;
+	private activeFinalizationProgressWatchdog: FinalizationProgressWatchdog | null = null;
 	private lastProgressSampleTimeMs = 0;
 	private lastProgressSampleFrame = 0;
 
@@ -650,65 +650,16 @@ export class ModernVideoExporter {
 		workload: FinalizationTimeoutWorkload = "default",
 		progressAware = false,
 	): Promise<T> {
-		let timeoutId: ReturnType<typeof setTimeout> | null = null;
-		let idleTimeoutId: ReturnType<typeof setTimeout> | null = null;
-		const timeoutMs = getExportFinalizationTimeoutMs({
+		return withFinalizationTimeout({
+			promise,
+			stage,
 			effectiveDurationSec: this.effectiveDurationSec,
 			workload,
+			progressAware,
+			onWatchdogChanged: (watchdog) => {
+				this.activeFinalizationProgressWatchdog = watchdog;
+			},
 		});
-		const idleTimeoutMs = progressAware
-			? getExportFinalizationIdleTimeoutMs({
-					effectiveDurationSec: this.effectiveDurationSec,
-					workload,
-				})
-			: null;
-		const watchdog: { refreshProgress: () => void } | null =
-			progressAware && idleTimeoutMs
-				? {
-						refreshProgress: () => undefined,
-					}
-				: null;
-
-		try {
-			return await Promise.race([
-				promise,
-				new Promise<T>((_, reject) => {
-					const rejectWithMessage = (message: string) => {
-						reject(new Error(message));
-					};
-					if (watchdog) {
-						this.activeFinalizationProgressWatchdog = watchdog;
-						const refreshProgress = () => {
-							if (idleTimeoutId) {
-								clearTimeout(idleTimeoutId);
-							}
-							idleTimeoutId = setTimeout(() => {
-								rejectWithMessage(
-									`Export timed out during ${stage} after ${Math.ceil(idleTimeoutMs! / 1000)} seconds without observable progress`,
-								);
-							}, idleTimeoutMs!);
-						};
-						watchdog.refreshProgress = refreshProgress;
-						refreshProgress();
-					}
-					timeoutId = setTimeout(() => {
-						rejectWithMessage(
-							`Export timed out during ${stage} after ${Math.ceil(timeoutMs / 60_000)} minutes`,
-						);
-					}, timeoutMs);
-				}),
-			]);
-		} finally {
-			if (timeoutId) {
-				clearTimeout(timeoutId);
-			}
-			if (idleTimeoutId) {
-				clearTimeout(idleTimeoutId);
-			}
-			if (this.activeFinalizationProgressWatchdog === watchdog) {
-				this.activeFinalizationProgressWatchdog = null;
-			}
-		}
 	}
 
 	private getNativeVideoSourcePath(): string | null {
diff --git a/src/lib/exporter/videoExporter.ts b/src/lib/exporter/videoExporter.ts
index ba015c3c..e213e83b 100644
--- a/src/lib/exporter/videoExporter.ts
+++ b/src/lib/exporter/videoExporter.ts
@@ -14,9 +14,9 @@ import type {
 } from "@/components/video-editor/types";
 import { AudioProcessor, isAacAudioEncodingSupported } from "./audioEncoder";
 import {
+	type FinalizationProgressWatchdog,
 	type FinalizationTimeoutWorkload,
-	getExportFinalizationIdleTimeoutMs,
-	getExportFinalizationTimeoutMs,
+	withFinalizationTimeout,
 } from "./finalizationTimeout";
 import { FrameRenderer } from "./frameRenderer";
 import type { SupportedMp4EncoderPath } from "./mp4Support";
@@ -112,7 +112,7 @@ export class VideoExporter {
 	private nativeWriteError: Error | null = null;
 	private maxNativeWriteInFlight = 1;
 	private nativeEncoderError: Error | null = null;
-	private activeFinalizationProgressWatchdog: { refreshProgress: () => void } | null = null;
+	private activeFinalizationProgressWatchdog: FinalizationProgressWatchdog | null = null;
 
 	constructor(config: VideoExporterConfig) {
 		this.config = config;
@@ -382,65 +382,16 @@ export class VideoExporter {
 		workload: FinalizationTimeoutWorkload = "default",
 		progressAware = false,
 	): Promise<T> {
-		let timeoutId: ReturnType<typeof setTimeout> | null = null;
-		let idleTimeoutId: ReturnType<typeof setTimeout> | null = null;
-		const timeoutMs = getExportFinalizationTimeoutMs({
+		return withFinalizationTimeout({
+			promise,
+			stage,
 			effectiveDurationSec: this.effectiveDurationSec,
 			workload,
+			progressAware,
+			onWatchdogChanged: (watchdog) => {
+				this.activeFinalizationProgressWatchdog = watchdog;
+			},
 		});
-		const idleTimeoutMs = progressAware
-			? getExportFinalizationIdleTimeoutMs({
-					effectiveDurationSec: this.effectiveDurationSec,
-					workload,
-				})
-			: null;
-		const watchdog: { refreshProgress: () => void } | null =
-			progressAware && idleTimeoutMs
-				? {
-						refreshProgress: () => undefined,
-					}
-				: null;
-
-		try {
-			return await Promise.race([
-				promise,
-				new Promise<T>((_, reject) => {
-					const rejectWithMessage = (message: string) => {
-						reject(new Error(message));
-					};
-					if (watchdog) {
-						this.activeFinalizationProgressWatchdog = watchdog;
-						const refreshProgress = () => {
-							if (idleTimeoutId) {
-								clearTimeout(idleTimeoutId);
-							}
-							idleTimeoutId = setTimeout(() => {
-								rejectWithMessage(
-									`Export timed out during ${stage} after ${Math.ceil(idleTimeoutMs! / 1000)} seconds without observable progress`,
-								);
-							}, idleTimeoutMs!);
-						};
-						watchdog.refreshProgress = refreshProgress;
-						refreshProgress();
-					}
-					timeoutId = setTimeout(() => {
-						rejectWithMessage(
-							`Export timed out during ${stage} after ${Math.ceil(timeoutMs / 60_000)} minutes`,
-						);
-					}, timeoutMs);
-				}),
-			]);
-		} finally {
-			if (timeoutId) {
-				clearTimeout(timeoutId);
-			}
-			if (idleTimeoutId) {
-				clearTimeout(idleTimeoutId);
-			}
-			if (this.activeFinalizationProgressWatchdog === watchdog) {
-				this.activeFinalizationProgressWatchdog = null;
-			}
-		}
 	}
 
 	private getNativeVideoSourcePath(): string | null {