Yes, not using Apple TV. Media in iTunes and use Apple TV to get on the big screen and stereo. Easy. Granted if you have an eclectic mix of acquired media of different formats you might have some work to get to this stage, so I can understand why you might not want to…
The first thing that springs to mind is that you don’t mention any DLNA servers. I don’t know how or even if your Smart TV can see networked media if it is not served up using DLNA. Twonky is an example of DLNA server software for the Mac.
I’ve experimented with DLNA Servers on my Mac serving up my Sony BD player which is DLNA compatible. It was a faff compared to iTune and Apple TV.