thanks to you three. i am using a Mac with Handbrake and MacTheRipper. i am seeding a MP4 torrent. see my Ryouna Kasai thread for download. it looks pretty good. please tell me your impresions.
i used a deinterlaced method called "slow". here are some explanations from handbrake FAQ:
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HandBrake's traditional deinterlacer, "Fast", is a simple linear filter. It averages together a column of pixels above and below the current one being filtered. In this average, it weighs down the value of pixels from the "bad" field being filtered away to practically nothing, while boosting up the value of pixels from the "good" field being preserved. The end result looks little better than simply line doubling, with jagged lines along any diagonals or curves. In fact, it can look a little worse than line doubling. Because the alternate field is suppressed but not entirely eliminated, it's sometimes possible to see its ghost in the output, as it subtly changes color and brightness to reveal the outline of an object that shouldn't be on screen until the next frame.
This is why HandBrake now offers a better method of deinterlacing, developed for the MPlayer project (the yadif filter). This new method does not have the problems "Fast" has. There should be fewer issues with jagged lines and no ghosting.
"Slow" looks to frames before or after to figure out which pixels to base its guesses on. Then, when it guesses, it tries to follow edges in the current frame. This means sometimes, instead of guessing based on a vertical column of pixels the way "Fast" always does, it will follow diagonals, sampling pixels that are, say, to the lower left and upper right of the current pixel. Most of the time, this will be good enough, and it should look better than "Fast."
"Slower" goes a bit further, and looks to frames before or after again, to tweak its guesses based on what it knows of the previous and next moments in time.
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i think with "slow" i picked the right one.
EDIT: and please pay attention to my other questions:
http://www.akiba-online.com/forum/showthread.php?p=186875#post186875