"str.charCodeAt is not a function"，anybody can help me?

[df257]

code is here: <script src="https://unpkg.com/@ffmpeg/[email protected]/dist/umd/ffmpeg-core.js"></script> <video src="" id="video"></video>

		if (typeof file === "string") {
			/* From base64 format */
			if (/data:_data\/([a-zA-Z]*);base64,([^"]*)/.test(file)) {
				data = atob(file.split(",")[1])
					.split("")
					.map((c) => c.charCodeAt(0));
				/* From remote server/URL */
			} else {
				data = await (await fetch(file)).arrayBuffer();
			}
		} else if (file instanceof URL) {
			data = await (await fetch(file)).arrayBuffer();
		} else if (file instanceof File || file instanceof Blob) {
			data = await readFromBlobOrFile(file);
		} else {
			return new Uint8Array();
		}

		return new Uint8Array(data);
	};

	createFFmpegCore().then(ffmpeg => {
		const { FS } = ffmpeg;
		console.log(ffmpeg);


		const transcode = async () => {
			await FS.writeFile('input.webm', await fetchFile('https://raw.githubusercontent.com/ffmpegwasm/testdata/master/Big_Buck_Bunny_180_10s.webm'));
			await ffmpeg.exec(['-i', 'input.webm', 'output.mp4']);
			const data = await FS.readFile('output.mp4');
			document.getElementById('video').src = URL.createObjectURL(new Blob([data.buffer], { type: 'video/mp4' }));
		}

		transcode();
	})
</script>`	

[df257]

when I use: await ffmpeg.exec('-i input.webm output.mp4'); This error is gone, there will be other error