crunchy.js

const request = require("request");
const { spawn } = require('child_process');
const fs = require('fs');
const cliProgress = require('cli-progress');

main();

function main() {
    if(process.argv.length < 3) {
        console.log('Usage: crunchy [url]');
    } else {
        download(process.argv[2]);
    }
}

function download(url) {
    let duration = -1;
    const options = {
        url: url,
        headers: {}
    };
    const outname = url.replace(/https?:\/\/.+\.[a-z]+(\/[a-z-]{0,5})?\//, "").replace(/[^a-zA-Z0-9]/g, "_")+'.mkv';

    request.get(options, function (error, response, body) {
        if (error) {
            return console.log(error);
        }
        const start = "vilos.config.media = ";
        const end = "vilos.config.analytics = ";
        if(body.search(start)===-1 || body.search(end)===-1) {
            console.log('error');
            return
        }
        const test = body.substring(body.search(start) + start.length, body.search(end) - 7);
        let langs = {};
        const meta = JSON.parse(test);
        duration = Math.floor(meta.metadata.duration);

        const streams = meta.streams;
        for (let i in streams) {
            langs[streams[i].hardsub_lang] = streams[i].url
        }
        if (fs.existsSync(outname)) {
            fs.unlinkSync(outname);
        }
        getStream(langs["enUS"])
    });

    function getStream(url) {
        function pad(num) {
            var s = "0" + num;
            return s.substr(s.length-2);
        }

        let ffmpeg = spawn("ffmpeg", ['-hide_banner', '-v', 'quiet', '-stats', '-i', url, '-c', 'copy', outname]);
        const durationstr = pad(Math.floor(duration/60/60)) + ':' + pad(Math.floor(duration/60)) + ':' + pad(duration%60);

        const bar1 = new cliProgress.Bar({}, cliProgress.Presets.shades_classic);
        console.log("Downloading to: ", outname);
        bar1.start(duration, 0);

        ffmpeg.stderr.on('data', (data) => {
            let timestr = data.toString().substr(data.toString().search(/[0-9]{2}:[0-9]{2}:[0-9]{2}/),8);
            let timearr = timestr.split(":");
            time = 1000*(parseInt(timearr[0])*60*60 + parseInt(timearr[1])*60 + parseInt(timearr[2]));
            bar1.update(time);
        });

        ffmpeg.on('close', (code) => {
            bar1.stop();
            console.log(`ffmpeg exited with code ${code}`);
        });
    }
}