'Lag' should only occur if your network doesn't have enough bandwidth or if your connection is not strong enough. Since the OP mentioned that they don't have an Internet connection on the TV, your 'app' suggestion will not work in this case.
i wish the smartview would work but audio sync is miles out, im not suggesting bt broadband is ace but it should not be a problem, if i use the your tube app everything is fine, if i try to use screen mirroring or the smartview app, lip sync is out by miles, if anyone can suggest a fix then fine then im all ears, so far Samsung support are a bit **** to say the least.
does smartview work for you without lip sync issues?
Yup, no issues on mine. When you use the YouTube app on your TV (or a Chromecast), it's the app doing the actual download, not your phone. With screen mirroring, it's the phone doing all the work, and then beaming the image and audio to your TV...that does take some processing, so I forgot that part: if your TV or phone (or both) processors are either not fast enough or are doing other things, image might suffer, and sometimes, audio sync. It also is app-dependent sometimes, unfortunately.
But for the most part, it's worked OK for me. No audio sync problems to a 3-year-old Samsung TV.
Most TVs support direct connections (WiFi Direct), so just set your TV to its screen sharing input and then set the S7 to
Screen Mirroring (or Smart View, can't remember what it's called there) so that it can see the TV.
If your TV, however, doesn't support direct connections, then you won't be able to wirelessly cast your screen without a router in the middle.
Gotta correct you, there are ways to cast without a router. Microsoft's Miracast doesn't require home internet or a router. I have one plugged into the HDMI of my TV and screen mirror my phone for Netflix and other streaming.
Thanks! I'll check my TV setting when I get home.On the newer phones that has been moved to the 'Smart View' menu. If you're on the same WiFi and the TVs are supported, you should see the option to cast from TV on the Smart View pop-up. Also check your router if there have been any configuration changes that might be blocking the mirroring traffic packets or VPN that might be active as this might restrict your phone's ability to see the TVs in the network.
If that doesn't work you can try and find an old version of the SmartView app (version 2, I believe) as the latest version on the Play Store removed the ability to mirror from TV as they planned to include that with the phone.
Thanks! I'll check my TV setting when I get home.