Hi David. If you are on a shared server, you will not likely get very far. You will be docked for using too many resources. Even if the video is 30 seconds long. Processing videos produces a spike in cpu and disk usage. Can you check your control panel?
Most providers of hosting do not inform you that you have exceeded a certain level - they just immediately begin to limit your resources.
There are several threads about this long-standing issue. There are also some things you might be able to adjust, too.