Help as in who, and how exactly? I'm not being sarcastic but seriously asking how someone might use this to setup a streaming service. Do they include this just so you can send demo media through it to prove that there is in fact a way get mediastreamvalidator to pass and we should spend more time passing option flags to ffmpeg?There are several tools available that can help you set up an HTTP Live Streaming service.
What's Apple's intended use case for mediafilesegmenter?
The mediafilesegmenter is a reference implementation of an HLS packager (for VOD). It is not intended to be used in a production environment; it is designed to produce working examples and as a validation tool for an actual production workflow.