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Andrew Wason from Motionbox Inc. sent me the following workaround, which allows you to activate video smoothing for FLVPlayback components (in this case the instance FLVPlayer):
MovieClip(FLVPlayer.getVideoPlayer(FLVPlayer.activeVideoPlayerIndex))._video.smoothing = true;
By converting the component video player’s data type to a MovieClip, you get around the video player’s access control and can directly access its video object. This way you can then change its smoothing parameter.
See it for yourself:
Thanks again to Andrew for sharing this workaround.