FLV image falls behind audio

Hi all,
I have a client who wants video with an alpha channel overlaying other images in an iPad application.
AFAIK this can only be done with FLV video files but the video files have pretty poor performance in the sense that often the audio starts and after a bit the image tries to catch up by increasing the framerate or skipping frames.
The videos are really short (3 to 5 seconds) and have a datarate of approx. 500kbps (onMetaData shows 500). Using an app called System Status I notice the CPU (ipad 2) reaches about 60-75% load when playing the video.
Does anyone know how to prevent the lag or know of another neat trick to display video with an alpha channel?
[edit]
Same thing happens (a tiny bit less?) with videodatarate==256.
Not really statistical but lower CPU load when playing the video seems to correlate with better playback.
Thanks in advance,
Manno

Thanks, Ill give it a try today and let'cha know. The article is quite interesting. :)

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