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field issue on broadcast monitor
Hi C4D people,
If anyone can shed some light on this issue, I would be extremely grateful. I will try to give you alll of the details.
I have made some moving elements in C4D that I need to composite in After Effects. I first tried rendering out everything progressively (without fields) but had some serious interlacing issues on my broadcast NTSC monitor. Trying a field render, it appears to be giving me the same thing.
The C4D project is set up at 30fps (I see no way to set it to 29.97 fps). I have rendered out as even field first (which I believe is the same thing as lower field first). In After Effects, I am interpreting the C4D quicktimes as lower field first, 30 fps.
When I render out from After Effects, my final quicktime is rendered lower field first at 29.97 fps.
Is there anything that I am doing wrong as far as you can see?
Thanks in advance.
-Frank R.
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5 Replies
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Sounds okay, but you still may wanna try to do a quick test render and try all possible combinations. Simpl animate a sphere moving fast across the screen and render it out with different field settings, then mangle it thru AE, also trying every possible combo. Only one of the clips is going to look alright on your monitor and that will give you the right combo for your particular needs.
Mylenium
[Pour Myl
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Hi Mylenium,
Thanks for your advice. I tried many different techniques, from motion blur to rendering 60fps. to different field orders. I am starting to feel that this issue may not be a field issue, but more of an NTSC issue. I get some aliasing on the edges of animation that is going up and down. Some of my animation looks fine, it is really only the segments that have vertical movmement. I am starting to think that may be the issue, and if that is the case, my only resort would be to change the animation.
I hoped that rendering out at 60fps could help, but it looked exactly the same. I am looking at the quicktimes directly out of C4D without going through After Effects, and I see that steppiness on the graphic, so I know if the problem is to be fixed it would have to be dealt with in C4D.
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Mmh, that’s indeed extremely odd. If it’s so arbitrary. Even in a “wrong” setup, it should at least be replicable every time. Well, let us know if you have a solution.
Mylenium
[Pour Myl
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If you are rendering 60 fps, progressive, and reinterpreting in AE, theoretically, you should be fine. I suspect what you are viewing is a ” red herring”. here’s a checklist. When you bring your 60 fps footage into AE, make certain it is correctly interpreted by AE as 60fps, no fields.
When you render out at 29.97 pick field dominance, ususally lower field first. That is mostly a hardware playback issue. Speaking of which, what are you using to view on NTSC? Is it giving you actual fields? some computer to video output combos do not represent interlacing properly as they play frame only of 1 field. One other question, is this a keyable element? is the matte set properly? Sorry I have more questions than answers, but fields can be a nasty issue, like some kind of a virus. -
Hello,
Thank you for responding to my post…I did revisit my issue. Unfortunately, I am still at a loss. I really think it is the limitations of NTSC. I only notice the problem while there is vertical animation. I tried re-rendering at 60fps and putting it in a 29.97 comp. going lower field first but still no improvement. I think it of being like a credit roll in which the speed must be exact or you will see artifacts due to the iinfrmation being caught in between the scanlines.
i may have to change my move so that there is less vertical movementt, ii am not suree what else i can do from here.thanks again for your information. they were good ideas.
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