Hi philm.
Whilst I know virtually nothing about any Humax devices (I've joined the forum ahead of buying a device), I do have a Sony Android TV. Unfortunately they are unable to play .ts files, however they do play .mkv files. These files allow you have subtitle. (I have converted my DVD library to .mkv and I know this works fine.) May I suggest that you download MKVToolNix and use that to change the 'container' for your videos. Just drag your .ts file into the top windows, set a destination at the bottom and click the 'Start multiplexing' button. It won't take long to do.