Sometime last year Fabio asked this question on his blog:
"Every day on the web new video related sites appear. Video sharing, video delivery sites or simply mashups, all Flash Video based. I'm very happy about this but there is a thing I can't understand and it is : why very often is video.smoothing property not used ? This is completely obscure to me because in my opinion a smoothed video is always better than a blocky one."
Say you have a FLA file (AS3) with an instance of the FLVPlayback component on stage and named it flvpb. You simply need to add the following code to enable smooting:
Hope this helps, go use it and tell your friends how smooth you are.
"Every day on the web new video related sites appear. Video sharing, video delivery sites or simply mashups, all Flash Video based. I'm very happy about this but there is a thing I can't understand and it is : why very often is video.smoothing property not used ? This is completely obscure to me because in my opinion a smoothed video is always better than a blocky one."
Of course he's right, video.smoothing is simple yet effective, once turned on your video will look a lot better. Take the following example. 
On the top you see the intro screen of a movie trailer with smoothing turned on, and on the bottom the same screen without smoothing (it looks bad because this video was scaled down quite heavily). Big difference, the top one looks a lot better.
Unfortunately smoothing (a property of the Video object in Flash/Flex) is turned off by default. To turn it on you simply set smoothing to true. Something like
myvideo.smoothing = true;
But what i you're using the FLVPlayback component? How does one access the underlying video object there? It's quite simple really if you know where to look. The FLVPlayback component uses the VideoPlayer object under the hood, and VideoPlayer extends Video and therefore inherits the smoothing property. Say you have a FLA file (AS3) with an instance of the FLVPlayback component on stage and named it flvpb. You simply need to add the following code to enable smooting:
var videoplayer:VideoPlayer = flvpb.getVideoPlayer(0);
videoplayer.smoothing = true;
Note that you have to specify an index when calling getVideoPlayer(), but if you are not dealing woith indexes then it should normally be 0 anyway.videoplayer.smoothing = true;
Hope this helps, go use it and tell your friends how smooth you are.
Personally I've had to avoid .smoothing on a few ocaissions because performance drops through the floor on larger dimension videos (with on2 especially). So really smoothing is fine when upscaling significantly, but best avoided otherwise?
that could make sense but I haven't tried it. So folks, use with caution, test your footage before deploying it.
BTW I think the latest Player performs better with smoothing. Tinic has some info too:
http://www.kaourantin.net/2007/06/mip-map-what.htm...
http://www.flashcomguru.com/apps/hd_full/hd.html
You can go full screen on that. Not sure about performance but it seemed ok here.
http://www.adobe.com/devnet/flex/articles/video_fl...
then use Stefan's tip.
I've had a developer build me an ap to record from a client's webcam and have suggested using the video.smoothing property to reduce pixelation. I found this code on Julian Pscheid's site:
(flv.getVideoPlayer flv.activeVideoPlayerIndex).smoothing = true;)
My developer said the ap wouldn't compile with the code and thought it could be only compatible with the old FMS. Is this code OK to use with FMIS?
It would be nice if we could automatically turn it on/off based on performance.
WARNING: The component 'FLVPlayback' requires ActionScript 2.0.
WARNING: The component 'DataBindingClasses' requires ActionScript 2.0.
i'm using fcs4 AS3