Note - the phone is just used as a controller so no battery drainage on the phone. Mezzmo itself on the PC is also a paid for application - but as I said there are other ways such as PLEX for using a chromecast dongle for streaming -for me Mezzmo is just simple, I have it anyway and it works on my smart TV's - but the chromecast works better than the smart tv using the built in (non chromecast) movie media server app. Note MEZZMO for android is 5 EUR -IHMO absolutely first rate as it does exactly what it needs to do - but you can get a 15 day trial for free to check it out. The phone is essentially the remote controller or handset for the application. The movie library / folder(s) will then be displayed on the phone - just click what you want to see on the TV and away you go. Note the list of servers is displayed ON THE PHONE app so click say the server you want your movies to come from.

You should then see your movie folders - browse to the one you want and start streaming. Start the Mezzmo app on your Phone - this acts as a controller for the TV - just click on the Mezzmo server icon on the PC you want to stream from. Switch your TV to the input where you've plugged in the chromecast dongle and ensure it's connected to the network. I use MEZZMO on the PC - start that up and on your Android / IPhone install MEZZMO for Android. These movies are on Local folders or network accessible folders on your PC / network. It's not very clear on the sales blurb about Google's Chromecast (probably for obvious reasons) but this device works fine for watching locally stored movies etc on your TV when streamed from a local PC (or PC connected to your network).

Chromecast app for pc windows 10