internal subtitle engine: timed text format (mp4) support

[bluedan]

It's the native format for subtitles in mp4 files, say: spec compliant.
It derives from the 3gpp format description.

Also, I wonder if the way Nero Recode implements subs (Vobsub pictures stored as a so called "private stream") they are detected by the player internally and displayed then.
Haven't tested yet, and won't be able in the near future :roll:

[bluedan]

To add: vsfilter from gabest seems to support that format already (as said in the doom9 forum).
Haven't tested so far unfortunately.
Also I was unable to find anofficial statement from gabest/ docs etc.... :roll: