function getWebmTitle() {
    let title = '';
    let d = new Uint8Array(this.data);
    console.time('getWebmTitle')

    outer:
    for( let i = 0; i < d.length; ++i ) {
        //mandatory muxingapp to skip reading header ( title placed before muxinap)
        if (d[i] === 0x4D && d[i + 1] === 0x80) {
            console.log('my exit no title')
            break;
        }
        if (d[i] === 0x15 && d[i + 1] === 0x49 && d[i + 2] === 0xA9 && d[i + 3] === 0x66) {
            for (let j = i + 4; j < i + 20; j += 1) {
                if (d[j] === 0x7B && d[j + 1] === 0xA9) {
                    j += 3;
                    title = String.fromCharCode.apply(null, d.subarray(j, j + (d[j - 1] & 0x7F)));
                    break outer;
                }
            }
        }
    }
    title = decodeURIComponent(escape(title));
    console.log(title);
    console.timeEnd('getWebmTitle')
    return title;
}