close the stream only when not transferred (fix #493)

Author: gildas-lormeau

Diff for: lib/core/codec-worker.js

@@ -205,10 +205,12 @@ async function runWebWorker(workerData, config) {
 		});
 	}
 	const resultValue = await result;
-	try {
-		await writable.getWriter().close();
-	} catch (_error) {
-		// ignored
+	if (!streamsTransferred) {
+		try {
+			const writer = writable.getWriter().close();
+		} catch (_error) {
+			// ignored
+		}
 	}
 	await closed;
 	return resultValue;