import MPEG4 video into Flash using AS2

Hi there, I want to import a .mp4 video into my Flash application. The player is Flash Lite 3.1, using ActionScript 2.0. I tried the code like this:

video_mc.play("videoname.mp4");

But it's running very slow in the divice. It takes very long time to start playing, and the video pictures are jerky. How can I improve it to make the video runing more faster and fluent? Should I add more code to the AS2?

Hope anyone could help me with this. Many thanks!