These instructions are for Linux. I don't know the first thing about Windows or Mac.
Building the ffmpeg-php Extension
Build and install PHP if it is not already installed
Unpack the ffmpeg-php sources
tar -xjf ffmpeg-php-X.x.x.tbz2
Change to the ffmpeg-php extension directory and run phpize (included with your PHP installation) to build configuration files. NOTE: if your php installation does not include phpize, you may have to install a php-dev package for your distro (usually named: php-dev, php-devel or similar)
cd ffmpeg-php-X.x.x/
phpize
Configure and build the extension.
./configure && make
Install the shared extension.
sudo make install
If everything went as planned, ffmpeg-php is now installed as a shared extension.
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Fatal error: Cannot instantiate non-existent class: ffmpeg_movie in C:\websitetesting\videostreaming\UPLOAD\include\classes\class.video_duration.php on line 60