There has been some discussion of this topic in another thread specific to Vizio (https://forums.plexapp.com/index.php/topic/29480-vizio-internet-apps/), but I wanted to start a new topic un-bury it from the depths of the other topic...
I am working on a plex client app for the Yahoo Connected TV Platform. My understanding (though I haven't confirmed this) is that this encompasses all Vizo Smart TVs and the Vizio Co-Star LT device, as well as several Samsung and Sony devices. A list of some devices using this platform can be found here: http://connectedtv.yahoo.com/tvdevices/. I have seen indication that a few other manufacturers might also use this platform on some devices, like Toshiba, Hisense, and others.
All I can confirm for sure is that every Vizio Smart TV I have tried is able to use the app I have created.
The app is currently in an Alpha state and soon to be released to the first few testers. So far, the only testers lined up are for the Vizio TVs. Please PM me if you would like to help test on other platforms or the co-star LT.
I hope to have a release ready for the app store within about a month, but that is realistically probably a pretty aggresive schedule. Naming/Branding for the app is still up in the air a bit based on some recent communication with the Plex team, but at the moment I'm calling it CRASH Player. Not very inspired, but based on my long-standing nickname Crash.
Most recent tests show excellent performance up to 1080p over ethernet or a solid wireless connection for Direct Play videos. Though the devices may vary in their media support, I have found that my TV seems to support the following formats very well:
Transcoding is a little tougher because of hardware limitations on the devices (at least the ones I have tested), but I believe a strong PMS machine would deliver the same performance. MKV (one of the more popular) is not a supported container format, and the media player (at least in my TV) does not support the HLS protocol typically used in the better Universal Transcoder. I am still working on the Transcoder performance and testing and will test the Universal Transcoder on some of the newer devices, but at this point I'm getting at least 'reasonable' results from a somewhat underpowered Plex server.
I should have the first Alpha release available for a limited number of testers within a week, assuming the holidays don't get in the way too much.
Watch this thread for more updates if you are interested in a Plex client for the Yahoo Connected TV platform.
Rob 'Crash' Hales