Hidden track?

i have a mpeg file of a concert
when you play it start to finish it seems to be one clip
if you click on the progress bar as it playing and skip back it has more footage not seen it the first time thru. it actually has multiple hidden tracks
and it never seems to be at the same place you click before
i seemed odd when i first got this file 53mb and only a small part of the show
i would like to pull out the multiple tracks..and make it one continuous file
is this possible


thanks..k