Large File Uploads, max file sizes and timeouts

Hey all, Two related questions. If I remember correctly this has been beaten to death before on the list, but here I am having issues with it, and ending up at somewhat of a loss still. I've built a media management system for a video company. It is built to handle large data assets, such as extended full size video files. As such, I've set the max upload file size in the php.ini file to around 3GB. I'm running into a bug where the system seems to think that the file upload is done at about 140MB on a 300MB file. Everything seems to close out fine within the system, acting like the file was originally 140MB and it uploaded just fine in the system. But it really is a 300MB file, I promise. Does this ring any bells with anyone? This is all over a local network, so I'm not inclined to believe that it is network lag triggering the connection to close... Second, can anyone point me in the right direction within the documentation to tell how to override the php.ini fiole on a particular page to allow a larger file upload size and a longer session timeout? Thanks all, Wes