youtube to mp4 stackoverflow

1var links = new String();
2var downlink = new String();
3var has22 = new Boolean();
4has22 = false;
5var Marked = false;
6
7var FMT_DATA = fmt_url_map;//This is html text that you have to grab. In case of extension it was readily available through:document.getElementsByTagName('script');
8
9var StrSplitter1 = '%2C', StrSplitter2 = '%26', StrSplitter3 = '%3D';
10if (FMT_DATA.indexOf(',') > -1) { //Found ,
11    StrSplitter1 = ',';
12    StrSplitter2 = (FMT_DATA.indexOf('&') > -1) ? '&' : '\\u0026';
13    StrSplitter3 = '=';
14}
15
16var videoURL = new Array();
17var FMT_DATA_PACKET = new Array();
18var FMT_DATA_PACKET = FMT_DATA.split(StrSplitter1);
19
20for (var i = 0; i < FMT_DATA_PACKET.length; i++) {
21    var FMT_DATA_FRAME = FMT_DATA_PACKET[i].split(StrSplitter2);
22    var FMT_DATA_DUEO = new Array();
23
24    for (var j = 0; j < FMT_DATA_FRAME.length; j++) {
25        var pair = FMT_DATA_FRAME[j].split(StrSplitter3);
26        if (pair.length == 2) {
27            FMT_DATA_DUEO[pair[0]] = pair[1];
28        }
29    }
30
31    var url = (FMT_DATA_DUEO['url']) ? FMT_DATA_DUEO['url'] : null;
32
33    if (url == null) continue;
34    url = unescape(unescape(url)).replace(/\\\//g, '/').replace(/\\u0026/g, '&');
35    var itag = (FMT_DATA_DUEO['itag']) ? FMT_DATA_DUEO['itag'] : null;
36    var itag = (FMT_DATA_DUEO['itag']) ? FMT_DATA_DUEO['itag'] : null;
37    if (itag == null) continue;
38    var signature = (FMT_DATA_DUEO['sig']) ? FMT_DATA_DUEO['sig'] : null;
39    if (signature != null) {
40        url = url + "&signature=" + signature;
41    }
42    if (url.toLowerCase().indexOf('http') == 0) { // validate URL 
43
44        if (itag == '5') {
45            links += '<a href="' + url + '&title=' + username + title + quality240 + '"style="text-decoration:none"><span class="yt-uix-button-menu-item" id="v240p">FLV (240p)</span></a>';
46        }
47        if (itag == '18') {
48            links += '<a href="' + url + '&title=' + username + title + quality360 + '"style="text-decoration:none"><span class="yt-uix-button-menu-item" id="v360p">MP4 (360p)</span></a>';
49        }
50        if (itag == '35') {
51            links += '<a href="' + url + '&title=' + username + title + quality480 + '"style="text-decoration:none"><span class="yt-uix-button-menu-item" id="v480p">FLV (480p)</span></a>';
52        }
53        if (itag == '22') {
54            links += '<a href="' + url + '&title=' + username + title + quality720 + '"style="text-decoration:none"><span class="yt-uix-button-menu-item" id="v720p">MP4 HD (720p)</span></a>';
55        }
56        if (itag == '37') {
57            links += ' <a href="' + url + '&title=' + username + title + quality1080 + '"style="text-decoration:none"><span class="yt-uix-button-menu-item" id="v1080p">MP4 HD (1080p)</span></a>';
58        }
59        if (itag == '38') {
60            links += '<a href="' + url + '&title=' + username + title + quality4k + '"style="text-decoration:none"><span class="yt-uix-button-menu-item"  id="v4k">MP4 HD (4K)</span></a>';
61        }
62
63        FavVideo();
64        videoURL[itag] = url;
65        console.log(itag);
66    }
67}
68