Media file size
Using Jamroom
try using M rather than G.
I see in the manual that its reads:
Quote: The available options are K (for Kilobytes), M (for Megabytes) and G (for Gigabytes; available since PHP 5.1.0), these are case insensitive.
http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
But give it a go as
upload_max_filesize = 1024M
memory_limit = 1024M
post_max_size = 1024M
And also make sure that the php.ini that you are editing is the one that is in use by the server. Sometimes servers that use control panels have alternative php.ini files.
You can check that your changes are taking effect by putting this in a php file and view it in a browser: