Upload vídeo error

Hi to all,

I've changed my php.ini file to change the max upload size, well at the first time this dont work with me beacause my php system have the 5 version and i rename to php5.ini and all works fine. Well, i have uploaded one vídeo file with 10mb and everything is alright but now i'm trying to upload a new file and i have always the same error "Undefined", i've tryed vídeos with 10mb, 20 mb and less than 10mb and always the same error.

What can i do, maybe the problem is the extension or the bitrate maybe....

Can you help me????

Thanks a lot, i hope realy that you can help me.

Best Regards