Allow automatic indexation

[fengalin]

As suggested in this discussion:

"I frequently listen to radio programs in my car (they last between 30 and 50 minutes). The car's music player navigation is convenient to jump between tracks (e.g. mp3 files), but not to seek within a specific track.

It would be great if a smart system could cut the file:

• Every 2 or 5 minutes.
• Not in the middle of a sentence.
• Cut depending on the type of audio sequence: conversation, music, ..."