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If the 1080i is 24p with pulldown, yes you can inverse telecine back to the original film frames, downscale to 720p, and reencode.
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Or you can use a player and TV that handles pulldown and interlace correctly.
- My sister Ann's brother -
If it is film based you do not need to reduce the resolution to get rid of interlace artifacts all you need to do is inverse telecine.
If it is video based you can deinterlace your source to 1080p60.
How did you get the notion that you need to reduce resolution to get rid or reduce interlace effects?
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- My sister Ann's brother
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A film source telecined to 29.97 interlaced frames per second will result in a duplicate frame every 5th frame if you deinterlace to 29.97 fps (leading to several little jerks every second during playback). If you inverse telecine you will remove that duplicate frame and be left with the original 23.976 film frames per second.
If your source isn't telecined film, but rather real interlaced video, deinterlacing to 29.97 fps will be smoother. Decimating to 23.976 fps will result in a jerky video. Best of all is to smart bob to 59.94 fps -- if your intended playback device supports it.
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