Editly not working, trying ffmpeg concat demuxer

.gitignore

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+/node_modules/
+*.mp4

README.md

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+
+
+ffmpeg -i odcinek1-kuba.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | hexdump
+
+^ daje waveform w dwubajtowych intach

package.json

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+{
+  "name": "vizualizer",
+  "version": "1.0.0",
+  "description": "ffmpeg -i odcinek1-kuba.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | hexdump",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^14.0.1"
+  },
+  "dependencies": {
+    "editly": "^0.3.0"
+  }
+}

tsconfig.json

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+{
+	"compilerOptions": {
+		"moduleResolution": "node",
+		"noImplicitAny": true,
+		"noImplicitThis": true,
+		"sourceMap": true,
+		"module": "commonjs",
+		"target": "es6",
+		"allowJs": false,
+		"strictNullChecks": true,
+		"esModuleInterop": true,
+		"outDir": "build"
+	}
+}

visualize.ts

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+const editly = require("editly");
+
+const graph_density = 1000;
+
+const threshold_at_point = 1;
+
+const inertia_s = 0.1;
+const inertia_samples = inertia_s * graph_density;
+
+let position = 0;
+let last_swap_position = 0;
+
+const s = (n: number) => Math.round(n / graph_density);
+
+const minutes = (units: number) => Math.floor(s(units) / 60);
+
+const formatTime = (units: number) =>
+	`${minutes(units)}:${Math.floor(s(units) % 60)}`;
+
+let keep_loud_until = 0;
+
+let total_speaking = 0;
+
+const results: [string, number][] = [];
+
+process.stdin.on("readable", () => {
+	let chunk: Buffer | null;
+	let was_loud_last_time = false;
+	while ((chunk = process.stdin.read()) !== null) {
+		for (let i = 0; i < chunk.byteLength; i++) {
+			position++;
+			const byte = chunk[i];
+			const volume = Math.abs(byte - 128);
+			const is_loud: boolean =
+				volume > threshold_at_point || position < keep_loud_until;
+			if (is_loud) {
+				total_speaking++;
+			}
+			if (is_loud != was_loud_last_time) {
+				results.push([
+					is_loud ? "silence" : "speaking",
+					position - last_swap_position,
+				]);
+				last_swap_position = position;
+				was_loud_last_time = is_loud;
+			}
+			if (volume > threshold_at_point) {
+				keep_loud_until = position + inertia_samples;
+			}
+		}
+	}
+});
+
+process.stdin.on("end", () => {
+	console.log(results);
+	const spec = {
+		outPath: "./out.mp4",
+		width: 800,
+		height: 600,
+		fps: 30,
+		defaults: { transition: { duration: 0 } },
+		audioFilePath: "/home/kuba/Downloads/odcinek1-kuba.wav",
+		clips: results.map((e) => ({
+			duration: s(e[1]),
+			layers: [
+				{
+					type: "title",
+					text: e[0] === "silence" ? " " : "Kuba Mówi",
+					position: "center",
+				},
+			],
+		})),
+		fast: true,
+	};
+	console.log(spec);
+	editly(spec).then(() => console.log("done!"));
+	console.log(formatTime(total_speaking));
+});