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FFMPEG - Convert to WAV

A forgiving node script that converts pretty much any audio file into a *.WAV, as it includes a check that the file is not already a WAV- this check is expecting confirmation of the mime-type being avalible from a previous step, however.

Determine Mime-Type - Audio⁠

By default, the WAV renders at 44.1 PCM - however, you can go deep with FFMPEG and I highly recommend the

FFMPEG Knowledge Expert GPT⁠

for exploring and learning about these variables.

import { promises as fs } from "fs";

import path from "path";

import ffmpeg from "fluent-ffmpeg";

import ffmpegInstaller from "@ffmpeg-installer/ffmpeg";

ffmpeg.setFfmpegPath(ffmpegInstaller.path);

export default defineComponent({

async run({ steps, $ }) {

const mimeType = steps.mime_type.$return_value.mimeType;

const filePath = steps.mime_type.$return_value.filePath;

const fileName = steps.mime_type.$return_value.fileName;

// Define the path for the new WAV file in the temp folder

const tempFolder = "/tmp";

const newFileName = path.basename(fileName, path.extname(fileName)) + ".wav";

const newFilePath = path.join(tempFolder, newFileName);

// Check if the MIME type is already audio/wav

if (mimeType === "audio/wav") {

$.export("newFilePath", filePath);

console.log("File is already in WAV format. No conversion needed.");

return {

newFilePath: filePath

};

}

try {

// Convert the audio file to WAV using ffmpeg

await new Promise((resolve, reject) => {

ffmpeg(filePath)

.output(newFilePath)

.on("end", () => {

console.log(`File converted successfully: ${newFilePath}`);

resolve();

})

.on("error", (err) => {

console.error(`Error converting file: ${err}`);

reject(err);

})

.run();

});

// Ensure the new file exists before proceeding

await fs.access(newFilePath);

$.export("newFilePath", newFilePath);

$.export("newFileName", newFileName)

return {

newFilePath,

newFileName,

};

} catch (error) {

console.error(`Error converting file: ${error}`);

throw new Error(`Error converting file: ${error}`);

}

});

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