Firefox doesn't load properly some videos with source provided as data URI

I want to embed video in my html page and use data URI to provide video source:<br /> <nowiki>[video controls]</nowiki><br /> <nowiki>[source src="data:video/ogg;base64,[video base64 code]" /]</nowiki><br /> <nowiki>[/video]</nowiki> This code works fine in Opera and Google Chrome, but in Firefox some of my videos are not properly loaded. Video is playing, but I can't seek in it and don't see its length. I use Firefox 21 on Centos 6.2 and Windows 7.