Mediabrowser freezes my server (mac mini 2011)

I'm trying pro version and MediaBrowser. I've managed to set it up and login through Internet. Browsing through media library is O'k.
But when I try to play video through Mediabrowser, ffmpeg process eats out CPU on a server and nothing can be viewed on a client. Serviio is installed on mac mini 2011.
Is there a way to totally disable any transcoding for everything including MediaBrowser?
Otherwise, Pro version and Mediabrowser has no sence for me...
But when I try to play video through Mediabrowser, ffmpeg process eats out CPU on a server and nothing can be viewed on a client. Serviio is installed on mac mini 2011.
Is there a way to totally disable any transcoding for everything including MediaBrowser?
Otherwise, Pro version and Mediabrowser has no sence for me...