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uncompressed avi losing quality.. (lots!)
i am taking a major hit in quality when i use uncompressed avis in after effects… i have no oidea whats going on here…
i am renering out clips as uncompresse avi, then reimporting them into a new project.
the avi looks fine in the preview window, but looks terrible in the comp. it really looks terrible! (look at screenshot)
if i drop in the same clip compressed as mjpeg, it looks fine in the comp! wtf??? I cant be using compressed files though, because clips may go through 2 or 3 rerenderings…
i’ve tried googling this issue, but i cant find anything… i took a screenshot, how do i post it here? isn’t there an uploa image thing here?? hhmm
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5 Replies
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I exported it from after effects… its just a regular ntsc dv avi…
i just don’t get what could be happening to screw it up like this..
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i just solved the problem, maybe you can make sense of this:
i remembered the other day i used the effect “force motion blur” to fix some shadow issues, and i noticed that it also improved the quality of some 2d images in the comp…
so on a whim, i tried adding force motion blur to the project, and still nothing… then i thought, well let me try turning up the shutter angle to 360 (default is 180).
and woah! PERFECT. what a difference
the composition settings motion blur did not do anything, the “force motion blur” effect fixed it perfectly. go figure..
the problem is it takes much much longer to render.. i mean like 4 to 8x longer.
i reduce the time considerably by setting “samples per frame” to 2. setting it to 1 had no effect on the avi quality.
still, i don’t know why i am having this issue. somethings going on… but at least this is a fix for now…
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oh, yes, i did look at the footage interpretation, everything is the same, ntsc dv, same pixel aspect, same fps, same color depth, same everything…
the weird thing is that compressedd footage doesnt have the same proble, its only with uncompressed. i tried quicktime uncompressed as well, same problem..
i might just try exporting the project and trying it on another PC because this makes no sense.
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DV and other NTSC formats have different field dominance…
DV is lower field first, all other NTSC SD formats (like uncompressed) default to upper first.
Back to Dave’s point…footage interpretation.
TimK,
Director, Consultant
Kolb Productions, -
Scott, What they are trying to tell you is that you have to turn the fields off on the .avi movie in your project window. So in the project window right-click on the movie, go to “Interpret Footage>Main” and in the “Fields and Pulldown” section set the “Separate Fields” option to “Off”. That should fix your problem.
A lot of interlaced video that looks great otherwise, looks like garbage in AE until you turn off the fields. The fact that the video in the preview window looks fine and the problem is only evident in the composition window in AE should be the first clue that you’re having field interpretation problems.
Hope that helps.
-E
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