I can't decide a proper way for this... One possibility is this: Info packet 1: ChapterId=1, TrackTime=3min Info packet 2: ChapterId=1, TrackTime=4min Info packet 3: ChapterId=2, TrackTime=3min ... But it seems over complicated. I'd like the ability to do this somehow: Single info packet: Chapters=3min,4min,3min,... (in case it wasn't obvious, all the "3min" stuff I meant as a vlc rational) But this can only be done either with parsable strings, or an array of vlc's. Parsable string is bad, and the current info setup does not allow for an array of vlc's... unless you embed it within a 'vb', which is even worse. Maybe Michael had a point in sorting info fields by "age"... I'd like to not follow the curse of mkv and end up with a container just as complicated. :/ This might be a solution: Single info packet: TrackLength=3min TrackLength=4min TrackLength=3min ... And the order they appear in the info packet is the order of the chapters... It's nice, but it gives significance to the order of the items in the info packet which I am not sure is a good idea. Using "TrackLength1", "TrackLength2", ... Is not good cause it's the same idea as parsable strings... Another note: I'd like to disallow info streams in non live streams.. For any purpose, info packets and chapters can be used. (It should at least be a "SHOULD"...) - ods15