Just noticed this issue with the latest Android TV Beta (7.24.0.13291) on my Bravia TV, as soon as I try and transcode I get the error. Happened with both TV Shows and Movies .
Direct play works fine.
I can play the same files using PMP and transcoding works fine on that, so looks like something in the client, not the server.
Happens if I choose the new player or the standard one.
Tried on various servers (remote and local) problem exists on all of them.
So after more testing,… it appears to something to do with passthrough.
If I enable passthrough in the Plex app on the TV (I have a receiver) then I get the problem.
If I disable passthrough then it works, once disabled, the TV has to transcode the audio as the TV does not support DTS, wheras if passthrough is enabled then the receiver will handle the DTS
Tried on my Shield which is running 7.24.0.13291 and transcoding works fine with passthrough enabled.