I need to create an animation in Flash and supply it as a video file.

It involves animating some text/client logo and some shapes/fades etc

I have tried a quick test and exported as an AVI (uncompressed) at 1280x720 size, and it seems quicktime and windows media player are unable to play the file back properly, it plays very slow and jagged, and the logo I have used is vector, appears fine in Flash when faded from alpha 0 to 100 to create a fade, but in the video the fading process seems very bad quality

Any help is much appreciated