there’s a few ways, here’s one”
export your current edit
(is your show rendered? then export a reference movie, it;s faster, and ok for what you need to do)
bring it back in,
and cut it into a timeline, but instead of a normal edit, use FIT TO FILL.
mark in & outs around the usable content of the show in the viewer,
in a new timeline, ad an in point at the beginning,
right click on the duration field of teh canvas and set it to frames,
and type 1000 into the duration,
then do a fit-to fill edit,
so you get a fairly even representation of your show in 1000 frames,
then export the timeline as an image sequence.
(export using quicktime conversion)
nick