Sending films on HD->AppleTV but still show subtitles?

Unless you need to reduce the file size, you might be better off just repackaging your movie with either MP4Tools or Subler. In any case both of those programs will let you add the SRT file to your movies.

A.

 

If you do not need to shrink the files, many/most MKVs can be re-written very quickly by Subler or MP4Tools into files that iTunes can read. If you do need to shrink the files, then Handbrake is the right tool.

If you are going to use Handbrake anyway, you can use it to add the SRT file. In the Subtitles tab, click on "Track" and choose "Add External SRT".

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Use the Airflow app (http://airflowapp.com/) to cast almost any movie to the Apple TV or Chromecast.
You can include subtitle files, and format and sync the subtitles to you liking. No need to create separate versions of the movies.

 

You should be able to see the subs in the .srt file by turning on closed captioning on your Apple TV - I think if you press and hold the "ok" button, it calls up the options that include closed captioning.

FYI, if the subs are of the forced type, e.g. English translation of non-English dialogue, Handbrake can burn-in the subs for you during the transcode to the ATV-friendly format. Go to the Subtitles tab in H/B and, in the main window, select "Foreign Audio Search" from the drop down bar; then check "Forced Only" and "Burned In". H/B will now search for "forced" subs - typically applicable only to incidental non-English dialogue - and burn in to the video image the applicable subtitles (in the original font, no less). You will not then have to turn on CC to see the forced subs as they're part of the video image.

If you want the entire subtitle track burned in, select the track you need from the dropdown box but do not check "Forced Only". H/B will then burn in the entire subtitle track.