PPTP tunnel using a Raspberry Pi

Well, this guy has everything covered.

Add srt to mp4

Without transcoding, and make it compatible with iTunes/iOS
Get MP4Box (bundled with Osmo4.app for OSX), and run:

Osmo4.app/Contents/MacOS/MP4Box -add input.mp4 -add input.srt:hdlr=sbtl:lang=gre out.mp4