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Frame blending using pixel motion: method used to go from progressive to interlaced footage, clean
Hi all!
Ok, I have a situation: I have a progressive QT (1080 29.97fps) movie to deliver as interlaced (1080i 29.97fps). The footage has some stop-motion and pixelation effects…so I was told that if I simply add this QT into fcp7 and export as interlaced or also I do it through compressor, my QT interlaced it will be not as clean as my original one because of this pixelation effect I am doing.
So, I was told to use the pixel motion effect from After Effects to double my frames the cleanest way. There is a tutorial around this forums, but it doesn’t really explain how to really use this effect , I am having trouble understanding how my frames will be double it, what I am doing:
importing QT into a new sequence, then Layer > Frame Blending > Pixel Motion, then what do i do? I guess I have to double the duration of my sequence, but then how does AE creates these extra frames? I need the clip rendered with twice the frame count…
The tutorial explains steps after frames are already doubled it, but can’t figure this out…WITHOUT USING FRAME BLENDING though..
can somebody help with this extra step? thank you so much everybody!!!
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5 Replies
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Hello Dave!
I will try your suggestion tomorrow once I am back in AE…but I was referring to this post, where apparently, if you do what he is saying, you have a clean/real interlaced footage,and yes, i need it for broadcast, the method I wanted to try out with pixel motion in AE is this one:
https://library.creativecow.net/articles/solorio_marco/interlacing_progressive_footage.php
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i’m with dave. i don’t think you’ll have any problems simply rendering your 29.97p footage as 59.94i without adding the frame blending.
if you were mixing footage and/or graphcis that were where some was interlaced and some was progressive, then you’d like to make them all the same (either all interlaced of all progressive), but since it sounds like you have one piece that’s all progressive, i don’t think you’ll need to worry about it.
that being said, if you want to do the frame blending trick, drop the footage into a new comp. enable pixel motion frame blending for the footage layer, add the comp to the render queue, click the render settings (probably says ‘best’) and in the field rendering setting choose upper field and render.
the output will be interlaced.
one pitfall with this method is if there are cuts in the piece, the interpolated field created by the pixel motion will be garbage. it may not be too noticeable at playout speed (heck it’s only 1/60 of second), but it may be an issue. the only way to get rid of that issue is prior to rendering with fields you need to split your clip at each cut (move the cti in the timeline to the frame after a cut and then hit command-shift-d). once you’ve done that at each cut, render as with fields and you should be good.
Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
Thanks Dave,
now I am thinking, if I am just rendering as interlace from AE, why don’t I do that from FCP7 already? So exporting the progressive QT and re-importing into an interlaced sequence, isn’t this then the fastest and easiest way?
what would be the difference from doing it from AE and FCP7?
thanks again! -
I will actually be editing in AE too…I am thinking to do all my effects and frame cuts in AE, and export from there a progressive QT.
Then importing into FCP7, and exporting upper filed dominance from FCP, how does this sound?
I need to deliver 1080i 29.97fps, ProRes(HQ) for broadcast
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Hi Dave!
I am actually doing compositing with AE and other stuff that can only be done in AE..The editing cuts in fcf7, and from there i was thinking to export to interlaced, so I don’t need to go back to AE, correct?
I think is the easiest workflow to export interlaced from FCP7, if is really exporting as such for broadcast..This is all I need to know, if I can trust exporting interlaced from FCP from a progressive footage placed into an interlace sequence?
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