Jerome Martinez - 2014-03-12

Good idea.
I added a full list of non-media tracks, example:

Other #1
ID : 3
Type : Scene description
Format : System Core
Codec ID : 2

Other #2
ID : 4
Type : Object description
Format : System
Codec ID : 1

Other #3
ID : 5
Type : Hint
Format : RTP
Codec ID : rtp

Other #4
ID : 6
Type : Hint
Format : RTP
Codec ID : rtp

Available in Development snapshots (version 20140312 or upper).