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Strange Jittery effect when playing back AE rendered QT file in FCP on NTSC Monitor?!
Hey cow friends : )
Here are the specs of my FCP project:
Uncompressed 10-bit / NTSC / 29.97 / lower fields / noneI am working on a project which is going back and forth from AE & Maya to FCP and today an animator gave me a QT file that seemed fine when playing it down in QT but then upon adding to my 10-bit NTSC sequence and rendering (the file was Animation not 10 bit uncompressed) the animation plays back in FCP & on the NTSC monitor in a very strange jittery way.
When i export the sequence after adding supers and rendering out the pieces which were given to me from animators (all animation qt files) the qt file plays fine its just when i play back the sequence in FCP that things look weird.
With agency and client people coming in on Friday I am very nervous about this issue and want to try to straighten it out because obviously they will want to watch on the plasma and/or ntsc monitor i nthe edit suite and not a little qt file.
Up to this point there has been no problems with the renders i have received and brought back into FCP – I also looked at the info for the file in fcp’s browser and it all seems normal to me – the only thing that is different is that the codec is animation so i just render out my 10 bit sequence and it should be ok but its not. In that I am home now and don’t have it in front of me i’m not sure if the AE render itself has any fields in it so when i add to the sequence and render I wonder if that has anything to do with it?? But this jittery action is not just interlacing its wrong flat out…but again when playing it in QT it looks fine – just in fcp and on the ntsc playback monitor does it look wonky.
If I am leaving out ANY details that would help solve this mystery please let me know as I need to resolve the issue asap.
Thank You!
Lisa
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3 Replies
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You can quickly check if its a field issue by applying the shift fields filter from the video category in the effects menu.
Set it to +1 and if this plays normal the fields are reversed in the animation file (rendered with fields set to upper, yours is lower).
(it doesn’t show up on the compi monitor in QT because computer monitors are always progressive and do not show fields. they de-interlace automatically.
If this doesn’t help I do not know what the problem might be?
PS. I’m in PAL land so I might be wrong, but shouldn’t uncompressed always be on upper fields?
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Hey there
thanks for the reply – i will ask the animator and check the filter idea tomorrow to see if it helps – and obviously if that IS the issue make sure he renders lower fields…but like i said in my post i checked in the fcp browser to see the info about the file and it says its lower fields so iam pretty sure that is NOT the issue.
to answer your question though – NTSC 720×486 uncompressed 10-bit is lower fields – CCIR 601.
The only other thing i forgot to mention was that the sequence once rendered was nested in order to add a widescreen filter 1;78;1 i believe to just give it that ltrbx look but that should not as far as i am aware cause this issue.
anyone else have some ideas – going to sleep now hoping for a miracle tomorrow : )
best
Lisa
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Hi Lisa,
Forget about what you see in your FC Canvas or QT.
Your NTSC monitor is telling you that there is an interlacing problem.
If the jittery affect only to the area of the Animation, is because FC is miss-interpreting his
field order. FC can never be sure about the field order of the QT files on import.
Because you are not sure that the Animation have been exported from AE or Maya as “Lower-first”,
don’t you?
Change the field order to NONE or Upper and drag the clip to the time-line again.
Render and see what happens in your NTSC monitor.
Cheers,
Rafael
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