automated converting between gif and mp4 with single image convertion separated

addAudio.js

@@ -0,0 +1,9 @@
+const { exec } = require("child_process");
+
+module.exports = function addAudio(inputVideoFile = __dirname + '/input.mp4', inputAudioFile = __dirname + '/input.mp3', outputFile = __dirname + '/output.mp4', callback) {
+    console.log('adding audio to video file');
+    exec(`ffmpeg -i ${inputVideoFile} -i ${inputAudioFile} -c:v copy -c:a aac ${outputFile} -y`, () => {
+        callback(outputFile);
+    });
+
+}