Baileys: [BUG?] Some audios don't work on Android but work on Web

When I try to send an mp3 audio file, it gets muted on Android but works on the Web. The problem also occurs on other phones, but I’m not sure if it happens on iOS.

One example of what I’m attempting to do is download a WhatsApp video, convert it to mp3, and then respond with the audio:

export const videoToAudio = async (data: Buffer, start: number, end: number) => {
    const filePath = path.resolve(BASE_DIR, uuidv4())

    const input = `${filePath}.mp4`
    const output = `${filePath}.mp3`

    fs.writeFileSync(input, data)
    return await exec(input, output, start, end)
}

const exec = async (input: string, output: string, start: number, end: number): Promise<string> => {
    try {
        return new Promise((resolve, reject) => {
            ffmpeg.ffprobe(input, (_, metaData) => {
              const { duration } = metaData.format
            
              let clipDuration = duration
              if (end) clipDuration = end - start
            
              ffmpeg()
              .input(input)
              .inputOptions([`-ss ${start || 0}`])
              // .toFormat("mp3")
              .outputOptions([`-t ${clipDuration}`])
              .output(output)
              .on("end", () => {
                resolve(output)
                unlink([input])
              })
              .on("error", (err) => {
                unlink([input, output])
                reject(err)
              }).run()
            })
        })
    } catch (err) {
        console.log(err)
        throw new CommandError()
    }
}

On the other side:

const audio = await videoToAudio(data, start, end)

// the jid is being passed on the background, but the object is the same as the second argument from the native function
await group.sendMessage({ audio: { url: audio } }, true)

I’m not sure about my memory, because I just migrated the code from another lib. But I think that in my previous tests it was working fine.

Does anyone know what’s causing the issue or have some ideas for me to try?