There is no need to improve my script??! Just a simple copy! (You may rename MY variable names, at least!! Buffoon!)

Same script (with auto-update + multilingual + multi format support [mp4, aswell as high quality flv + normal flv!!]):
http://userscripts.org/scripts/show/28918

Or... you could use this script, which does work:

http://userscripts.org/scripts/show/28178

Hi people,

I've done the same as you, but i looked behind the scenes so there were some problems in the code, i've tried to sove:

      // ==UserScript==
      // @name          Download ANY Video from YouTube
      // @namespace     http://userscripts.org/users/37550
      // @description   adds a link to download flv from You Tube
      // @source        http://userscripts.org/scripts/show/28937
      // @identifier    http://userscripts.org./scripts/source/28937.user.js
      // @version     5
      // @date          2008-06-62
      // @creator       Sn1p1ng Guy117
      // @include       *youtube.*/*v=*
      // ==/UserScript==
      
      
      
       var download_url = 'http://www.youtubemp4.com/video/';
       var playerDiv = document.getElementById('movie_player');
       var flashvars = document.evaluate("attribute::flashvars", playerDiv, null, XPathResult.STRING_TYPE, null).stringValue;
       var video_id = flashvars.match(/video_id=([^(\&|$)]*)/)[1];
       var video_format = '.mp4'; 
       var video_url = download_url + video_id + video_format;
      
      function getEl(w){
      	return document.getElementById(w);
      }
      
      
      
      autoupdate();
             desc = getEl("watch-views-div");
             descP = desc.parentNode;
             dv = document.createElement("a");
             dv.innerHTML=" Download MP4 ";
             dv.setAttribute("rel", "nofollow");
             dv.setAttribute("class", "actionLink");
             dv.href=video_url;
             descP.insertBefore(dv, desc);
      
      function autoupdate() {
      var day = GM_getValue('day');
      if(day == undefined){
      	GM_setValue('day',new Date().getDay());
      }else{
      	if(day != new Date().getDay()){
      
      		GM_xmlhttpRequest({
      			method:"GET",
      			url:'http://userscripts.org./scripts/source/28937.user.js',
      			onload:function(result) {
      				if (result.responseText.indexOf('@version     1') == -1) {
      					var div = document.createElement("div");
      			div.setAttribute("style", "background-color: #00FF00;");
      					div.appendChild(document.createTextNode('There is a new version of the "Download ANY Video from YouTube" userscript.'));
      					div.appendChild(document.createElement("br"));
      
      					var a1 = document.createElement("a");
      					a1.setAttribute("href", "http://userscripts.org/scripts/source/28937.user.js");
      					a1.appendChild(document.createTextNode('Click here to install the script update'));
      					div.appendChild(a1);
      
      					document.body.insertBefore(div, document.body.firstChild);
      			GM_setValue('version',version + 1);
      				}
      			}
      		});
      		GM_setValue('day',new Date().getDay());
      	}else{
      
      	}
      	}
      }
      

I don't guaranty anything but the syntax errors are gone. ;)

Ditto for me - I've installed and re-installed, but never see the "Download MP4" link. Too bad... this sounds like exactly the script I wanted. I've got very little use for low-res FLVs, but would love a quick and easy way to grab the MP4s.

Np. By the way Author, your include should be correctly put as http://*youtube.com/watch?=v*

Script isn't even working now, at all, no matter how many times I re-install.

Oh! ^^ Sry for that one dude... I missunderstood! ;-D

Yea... looks like that... Well... just use...
http://userscripts.org/scripts/show/28918
Now available in over 10 languages! :-)

Not yours. His.

Yea... For sure! If my script was uploaded first, it has to be a copy!?! *eye-roll*

FLV because not all videos are available as mp4!

haha yea script copy. and this isn't mp4 format, it's flv....

Same script (with auto-update + multilingual) already exists at:
http://userscripts.org/scripts/show/28918

Whereabouts should this link be? I've installed it three times total, haven't seen it yet...

*EDIT* Whooops, found it.