quicktime problems

de-interlacing is the process of removing half of your resolution to avoid motion artifacts when viewing interlaced footage for the web.

if your picture consists of lines 1,2,3,4,5,6,7,8, etc de-interlacing removes the odd lines 1,3,5,7 etc. With interlaced material thats exactly what you want, otherwise you get 2 fields showing up on computer monitors. But if you shoot progressive you do not want to de-interlace (you are throwing away half of your vertical resolution)

As far as I can tell i'ts a bug in quicktime.
 
I now dream in h.264. All my dreams are also less than 50MB and are 400 x 225 pixels. Of course this is only when I'm sleeping and not staying awake to verify that my file has uploaded to the server.
 
Darkline said:
de-interlacing is the process of removing half of your resolution to avoid motion artifacts when viewing interlaced footage for the web. if your picture consists of lines 1,2,3,4,5,6,7,8, etc de-interlacing removes the odd lines 1,3,5,7 etc. With interlaced material thats exactly what you want, otherwise you get 2 fields showing up on computer monitors. But if you shoot progressive you do not want to de-interlace (you are throwing away half of your vertical resolution) As far as I can tell i'ts a bug in quicktime.
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??? wow, well I'm just not getting that behavior. I guess when you watch my movie you'll see... I deinterlaced it and when you pause it or scrub it, it has that nice 24fps progressive look to it. but I'm gonna try and do another run (just for my own testing purposes) where I *don't* deinterlace and see what happens. But from memory, it gives me the thing you say I'm supposed to get when I deinterlace: jagged edges and ghost-type double images. :huh:
 
hi flint

you're exactly right on the nose. The problem is quicktime has it the wrong way round. You should not be de-interlacing unless you shoot interlace. The reason it looks good to you is because quiktime has an error. Take a still into photoshop and de-interlace and you'll see the result. Presuming you shoot with the DVX in progressive mode then de-interlacing only degrages your footage.

I can only presume why it looks good is exactly what I said before, quicktime has an encoding error and has it the wrong way round. it's defaulting to de-interlace when the box isnt checked. When you check it, it leaves your footage alone and does not de-interlace.

very very wierd..

one thing you could try is de-interlacing directly in your editor, or like I say in photoshop. This will show you what it does to your image.
 
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