Has anyone succeeded installing ffmpeg-php on a windows server environment?

Don't do this. There is no good reason to deal with the headache. Even if you get it working, the continued hassles you'll deal with are far worse than learning the basics you need to get a Linux server running. Building a transcoding service in PHP under Linux is hard enough already (speaking from experience). If you must run a Windows server, write your code in a Microsoft language for a Microsoft environment. If you must use ffmpeg and PHP, get a linux server. You can prototype on an Amazon EC2 micro instance for free (for the first year). You can take an old desktop you have laying around and run a Linux server on it. You can even run one inside a VM. There is no solid reason you should be doing this in Windows.