When you use the Export Animation to File tool, you can opt to create a compressed file. Compressing an animation converts the data into a format that requires fewer bits, usually so that it can be stored or transmitted more efficiently. The program offers an extensive list of video compression coders to choose from.
To compress an animation output file:
Select Tools > Animation > Animation Properties, or click the Animation Properties button on the Animation toolbar. This button is also available in the Preview Animation and Export Animation to File windows.
In the Animation Properties dialog, select the Output File tab.
Select the desired coder from the Video Compression drop box.
Click OK.