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Are you scaling the videos in flash at all?
I'm actually making the flv smaller on the stage after the encoding from 640 x480 (original QT size) to 450 x 300
Did you re-encode to 450X300 or pull in the 640X480 video and display it in a player that is 450X300?
I ask because scaling is a very tenuous thing. Common sense says that when you scale something down it will be fine, perhaps a little blurry from pixels getting crushed together, and when you scale up, it will get pixelated because the software has to make information up. Fact of the matter is, real-time scaling is bad in both directions. That is likely your problem with the lines and artefacting that you are getting.
I would re-encode the videos to be the size that they will display at.
I recoded 640 x 480 then pulled in and displayed. I'm recoding again this time in the original size the flv will be seen as
450 x 300, let you know when I'm done.
I find pans, zooms and speed ramping looks awful if less than 700kpbs. So encode to HQ 700 in first instance
U used QT Pro exported the original qt.mov from 640 x480 to 450 x300.
The smaller version looks fine.
Then I exported the smaller .mov to Flash usng
maintain aspect ratio
the movie looks decent but look at the beginning text how it is dostorted
how does it look to you?
plz click Decafe button
The text at the beginning doesnt look great. Rest of the video is passable.
I would normally use a nice big mov to create my FLV's - 1024 x 526. But it is painfully slow converting it to flash if you're using the CS3 encoders.
If I were you, I'd upgrade to CS4 and use the H264 encoder to f4v. There is a considerable difference in the quality, and it encodes really fast. Downside - people have to have flash player 10.