Function imageToWebp

lib/exif.js:20–45

(media)

async function imageToWebp (media) {

    const tmpFileOut = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.webp`)
    const tmpFileIn = path.join(tmpdir(), `${Crypto.randomBytes(6).readUIntLE(0, 6).toString(36)}.jpg`)

    fs.writeFileSync(tmpFileIn, media)

    await new Promise((resolve, reject) => {
        ff(tmpFileIn)
            .on("error", reject)
            .on("end", () => resolve(true))
            .addOutputOptions([
                "-vcodec",
                "libwebp",
                "-vf",
                "scale='min(320,iw)':min'(320,ih)':force_original_aspect_ratio=decrease,fps=15, pad=320:320:-1:-1:color=white@0.0, split [a][b]; [a] palettegen=reserve_transparent=on:transparency_color=ffffff [p]; [b][p] paletteuse"
            ])
            .toFormat("webp")
            .save(tmpFileOut)
    })

    const buff = fs.readFileSync(tmpFileOut)
    fs.unlinkSync(tmpFileOut)
    fs.unlinkSync(tmpFileIn)
    return buff
}

async function videoToWebp (media) {