thanks! that worked!
But Im confused...this isn't mirroring correct? Airplay is different? Just curious if this is in HD or not...seems to be good, not noticeably grainy.
Now if I could only make the subs a little larger, but I can't complain...very nice that it works as well as it does. No lag, or graininess.
Glad it worked for you.
Now as for Airplay vs Mirroring, as I understand it, and again I could be wrong
Airplay basically sends the raw video file to the ATV to be played, so the file has to be in a format that the ATV can already play. Where as mirroring takes whatever is displayed on the screen, encodes it as a video stream and then sends it to the ATV, so with mirroring you're not just limited to displaying video files, you can mirror things like applications.
If the file you're airplaying to the ATV is HD then what you get on the ATV will also be HD.
As for the subtitle size, I think
Subler will allow you to change the subtitle size. Open the video file with Subler, double click on the subtitle track, and I'm sure there is some sort of option to scale the subtitles up, then re-save the file.