fix(windows): normalize export save path and relax early decode end

electron/ipc/handlers.ts

@@ -638,7 +638,6 @@ export function registerIpcHandlers(
 			return null;
 		}
 	});
-
 	ipcMain.handle("save-exported-video", async (_, videoData: ArrayBuffer, fileName: string) => {
 		try {
 			// Determine file type from extension
@@ -664,11 +663,18 @@ export function registerIpcHandlers(
 				};
 			}
 
-			await fs.writeFile(result.filePath, Buffer.from(videoData));
+			// --- FIX: Normalize the path for Windows compatibility ---
+			const normalizedPath = path.normalize(result.filePath);
+
+			// Ensure the parent directory exists (Windows may fail if the folder is missing)
+			await fs.mkdir(path.dirname(normalizedPath), { recursive: true });
+			// --- END FIX ---
+
+			await fs.writeFile(normalizedPath, Buffer.from(videoData));
 
 			return {
 				success: true,
-				path: result.filePath,
+				path: normalizedPath,
 				message: "Video exported successfully",
 			};
 		} catch (error) {
@@ -680,7 +686,6 @@ export function registerIpcHandlers(
 			};
 		}
 	});
-
 	ipcMain.handle("open-video-file-picker", async () => {
 		try {
 			const result = await dialog.showOpenDialog({

src/lib/exporter/streamingDecoder.ts

@@ -492,6 +492,8 @@ export class StreamingVideoDecoder {
 		this.decoder = null;
 
 		const requiredEndSec = segments.length > 0 ? segments[segments.length - 1].endSec : 0;
+		const isWindows = typeof navigator !== "undefined" && /Windows/.test(navigator.userAgent);
+
 		if (
 			shouldFailDecodeEndedEarly({
 				cancelled: this.cancelled,
@@ -502,9 +504,17 @@ export class StreamingVideoDecoder {
 		) {
 			const decodedAtLabel =
 				lastDecodedFrameSec === null ? "no decoded frame" : `${lastDecodedFrameSec.toFixed(3)}s`;
-			throw new Error(
-				`Video decode ended early at ${decodedAtLabel} (needed ${requiredEndSec.toFixed(3)}s).`,
-			);
+
+			if (isWindows) {
+				console.warn(
+					`[StreamingVideoDecoder] Decode ended early on Windows at ${decodedAtLabel} (needed ${requiredEndSec.toFixed(3)}s) – proceeding anyway.`,
+				);
+				// Do not throw on Windows; allow export to complete with the frames we have.
+			} else {
+				throw new Error(
+					`Video decode ended early at ${decodedAtLabel} (needed ${requiredEndSec.toFixed(3)}s).`,
+				);
+			}
 		}
 	}