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Thanks for your help, my PHP is not very good. I have modified the embed code, but it now it embeds "http://www.youtube.com/v/&rel=1". I can't find anything wrong with the sscanf line or the sections relating to YouTube, I've compared it with the other working sections and have found no differences...
Edit: I also commented out the section that resets your max size value based on your ini file, because for some reason it would always reset to 35KB.