The AirPlay's playing principle is, if nPlayer sends a file to the Apple TV, playback is done on the Apple TV. You have to set up Apple TV's subtitle on Settings of Apple TV. Please refer to the link below for the details :
nPlayer Help - Changing the subtitle style of the PIP mode
Hello dear nPlayer mania!
Thank you for latest update!) It's brilliat!
I have one more comments for furure updates. Please specify each update in details, what is done, which bug was fixed and etc. This is really usefull and help your client to look what is gob was done from your side and how many wishes were sent to your from your clients.
P.S. look at release note of facebook - brrrr(((