I 've searched on posts about closed captions and found not so much so…
I use Handbrake to rip dvds to mp4. With the subtitle options i select Closed Captions if available. The Handbrake wiki ( https://trac.handbrake.fr/wiki/Subtitles ) says that CC’s are passed thru to the output file (in mp4’s they will appear as subtitles). When i open the finished file in either QuickTime or VLC the subtitles do appear properly (when, of course, the subtitle track is selected). In Media Player I show 2 subtitle options in the subtitle tab: one is (eng); the other is (und). neither one, when selected, produces viewable subtitles (side note: they don’t appear in XBMC, either). The Apple TV pref and the Media Player settings are both enabled to show subtitles.
Is there something I’m doing wrong (and/or fundamentally misunderstanding) or does Media Player NOT support passed-through closed captions?