I couldn't find an obvious post on this, so apologies if this has been answered before.
What is the lowest res format to export an animation? I have to admit I am not au fait with the formats in the export menu, and managed to render a 2 gig file lasting 3 minutes (rendered in 25 hours on my lowly g4 cube


Also is there a way to alter the speed logarithmically (animation speeds up or slows down) without importing the animation into an external editor?
Thanks!