http://www.vbulletin.org/forum/showthread.php?t=263950

First of all, you will need to create a new BB Code:

Login to your Administration Panel, find "Custom BB Codes" in the sidebar, click it. And click add new BB Code:

Title: attachvideo
BB Code Tag Name: attachvideo
Replacement:

<script type="text/javascript" src="http://yoursite.com/flashplayer/jwplayer.js"></script>
<div id='mediaspace_{param}'>Loading the player...</div>
<script type='text/javascript'>
jwplayer('mediaspace_$attachment[attachmentid]').setup({
'flashplayer': 'http://yoursite.com/flashplayer/player.swf',
'file': 'http://yoursite.com/attachment.php?attachmentid={param}',
'controlbar': 'bottom',
'width': '720',
'height': '480',
'type': 'video',
'provider': 'video'
});
</script>

Replace "yoursite.com" with the domain of your site.

It will give you this message:
"The following BB Code replacement may not be properly formed. All HTML attributes should be enclosed within double quotes. "

Click "Continue", since the BB Code will work without any problems...

Example:
[attachvideo]2322[/attachvideo]

Description:
With this BB Code you will be able to embed multiple videos that are uploaded as attachments.

Use {option}: No.

Remove Tag If Empty: Yes.

Disable BB Code Within This BB Code: Yes.
Disable Smilies Within This BB Code: Yes.


Save it...

Now, how to take out the attachment ID from the link?

Let's say that you uploaded some .flv file, when you hover over it, you'll see something similar to this:
http://yourdomain.com/attachment.php...1&d=1302358811

Part that you need is "2322"

Simply wrap it in:

[attachvideo]2322[/attachvideo]

You need JW Player for this, download it here:

http://www.longtailvideo.com/players/jw-flv-player/

Create a new folder in your public_html called "flashplayer", upload these files in it:
- jwplayer.js
- player.swf
- swfobject.js
- yt.swf

http://vbsupport.ru/forum/showthread.php?t=23804

@kerk,
вот шаблон в 4ке

PHP Code:

<li>
<img class="inlineimg" src="{vb:stylevar imgdir_attach}/{vb:raw attachment.attachmentextension}.gif" alt="{vb:rawphrase file_type_x, {vb:raw attachment.attachmentextension}}" />
    <a href="attachment.php?{vb:raw session.sessionurl}attachmentid={vb:raw attachment.attachmentid}&amp;d={vb:raw attachment.dateline}"<vb:if condition="$show['newwindow']"> target="_blank"</vb:if>>{vb:raw attachment.filename}</a> 
({vb:raw attachment.filesize}<vb:if condition="$show['views']">, {vb:rawphrase x_views, {vb:raw attachment.counter}}</vb:if>)
</li> 


как туда корректно вставить твой код?

PHP Code:

<if condition="$attachment[attachmentextension] == 'flv'">
            <!-- FLV -->
              <embed src="pl.swf" width="400" height="250" allowscriptaccess="always" allowfullscreen="true" 
flashvars="type=flv&amp;volume=50&amp;width=400&amp;height=250&amp;file=attachment.php?$session[sessionurl]attachmentid=$attachment[attachmentid]&amp;showstop=true&amp;autostart=false" />
            <!-- FLV -->
         </if>

          <if condition="$attachment[attachmentextension] == 'mp3'"> 
            <!-- MP3 -->
             <embed src="pl.swf" width="300" height="20" allowscriptaccess="always" allowfullscreen="true" 
flashvars="type=mp3&amp;volume=50&amp;width=300&amp;height=20&amp;file=attachment.php?$session[sessionurl]attachmentid=$attachment[attachmentid]&amp;d=$attachment[dateline]&amp;showstop=true&amp;autostart=false" />
            <!-- MP3 -->
         </if>