You're welcome

However, UTF8 is a uhmn, character encoding format, and the .srt file has to be encoded in UTF8 in order for the subtitles to displayed by quicktime (which runs the video on the ATV). If it is not, quicktime will crash.
I think subcleaner by default encodes in UTF8, but if you download srt's from the internet, or edit them yourself, you will often find that they are not encoded in UTF8, and if you do not do so yourself, you will end up with a video that crashes the first time subs are to be displayed.
It's really easy to fix though, open the .srt in textedit, "save as", and then choose "UTF-8" as the format (if you can't, then first choose "make plain text", in the "formats" menu). Don't change anything, and just save with the same name.