MPEG 4 Video VOP

[DuneSoldier]

Does anyone know anything about MPEG4 video and VOP structures? At the moment, I'm parsing out a 3gp structure. Right now I'm just playing around in Python trying to split up a 20 second file I created into multiple ones.

I've been able to drill in and find the VOP objects in the file. But I can't seem to find any good technical data as to what the VOP structure actually is.

[sxmaxchine]

I have no idea, and getting information of mp4 might be quite dificult compared to theora (.ogv).

[DuneSoldier]

Hmmm yeah, I'm just not sure where to start looking. Unfortunately I think I'm going to be working with MPEG 4 in a few months for work so I'm playing with it to get an understand today.