What do you mean by "you can't make changes on php.ini file"? It doesn't exist? Create it! It's not writable (e.g., 444 permissions)? Change it to 644! You can enter your settings but they appear to have no effect? Run this script:
before and after making a change, and see if it shows up (the setting does change). Do you have the line in .htaccess telling the server where to find php.ini? E.g.,
(or wherever you put php.ini, if not in the site root).

I would really put the video somewhere else, though- simply for the server load aspects.