FFmpeg is a complete solution to record, convert and stream audio and video. It includes libavcodec, the leading audio/video codec library. FFmpeg is developed under Linux, but it can compiled under most operating systems, including Windows. The project is made of several components:
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PHP can be run at localhost. It is very easy to setup a localhost and get your PHP pages running. Better than online server for practicing and building things before you upload the final PHP web based application at remote online server or at your web host.