Making .mp4 with Actionscript 3 and what to use for 3D animation

Dear user,
I have to load several images and then do 3D image animation.
For this if I use Flash CS4 platform,do I have to use Papervision 3D or other 3D open source classes.
Further,I have to create a movie file which contains all the image animation and allow user to view it.
It is similar to animoto.com website concept.
So,is it possible to make .mp4 files with actionscript or I have to rely on AIR platform.
Thanks in advance.