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visable fields in uncompressed footage
I’ve noticed that footage captured from either my Kona 2 or Io AD with the uncompressed 10 bit codec have visible fields – huge horizontal bars that break the smooth lines of an object. When played back out to an NTSC monitor all is well, but if I scale, move, rotate or composite the clip the fields turn into ugly visible bars. Especially when importing it into AE. As a work around I have been de-interlacing the footage and re exporting a new QT to bring into AE. Is that right? or am I doing something wrong?
Also, I am still changing the sequence settings field order to none so that my text is crisp. Has this been fixed in a FCP/QT/kona/OS upgrade? I’m still running FCP 5.0.2, Kona 1.1.4, QT 7.0.2, OS 10.4.2 Should I upgrade any of these?
-Rick
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8 Replies
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We might be thinking of 2 different things here, but NTSC footage should contain fields. It is really inherent in the format, however you should not see them when playing video on and NTSC monitor. Where is your source footage coming from (beta, DV, Film)?
Jared
Idea Spring Editing, Inc.
Denver Final Cut Pro UG -
I know it is the fields, but unlike DV footage, or uncompressed footage that is imported form say a Cinewave system. The AJA footage seems to show the fields visually as large stripes when paused. Again, this isn’t an issue, except when I try to roto in After effects. Then the image has major stair steps. This happens on two different systems, one with a Kona 2 and one with a Io.
I don’t think this is a “problem” I am just wondering what others are doing in the same situation.
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Large stripes? Is there a way you can post a screen grab?
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G5 Dual 2Ghz <> 4GB RAM <> FCP 5.02 <> Kona 2
ATTO 42XS <> Huge Systems 4105 Fibre -
[Rick Sebeck] “know it is the fields, but unlike DV footage, or uncompressed footage that is imported form say a Cinewave system. The AJA footage seems to show the fields visually as large stripes when paused. Again, this isn’t an issue, except when I try to roto in After effects. Then the image has major stair steps. This happens on two different systems, one with a Kona 2 and one with a Io.”
You should not see stairstepping at all with uncompressed footage, especially what you’re describing as large stripes. Are you cutting in an Uncompressed Sequence (720×486) Lower field first? Almost sounds like you’re putting the footage into a DV timeline which would result in some weirdness.
Also, ensure your Video Processing controls are set to Best.
Walter Biscardi, Jr.
https://www.biscardicreative.comNow editing “Good Eats” in HD for the Food Network
“I reject your reality and substitute my own!” – Adam Savage, Mythbusters
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When you mentioned cinewave and paused a thought popped into my head.
It is my understanding that the cinewave paused on a single field, not a frame. The Kona can do that as well, but you just have to set it up in the Kona Control Panel. I don’t recall of had exactly where it is located (my guess in the codec tab) but it should be there with 2 options somewhat like full fame or single field. Let me know if this solves your problem or not.
Jared
Idea Spring Editing, Inc.
Denver Final Cut Pro UG -
I posted a still here – https://homepage.mac.com/ricksebeck/.pictures/visiblefields.tif
The “pause on a field or frame” is for the NTSC monitor.
Is this just normal fields? Again, its not noticeable on an NTSC monitor until you scale, rotate, or move the image or if you take it into AE to rotoscope and such. Another thing I noticed is that it happens in a 3:2 cadence. That is, 3 frames are smooth, two frames are like this. Any footage i bring in via the kona uncompressed ha this distortion – and I am not saying that it is “wrong” I am just wondering how you all deal with the footage when you scale it of try to composite with it. Again, I de-interlace it first, but I am sure that is adding some degradation.
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Looks like fields to me. this is loosely explained, but you should remember if you have 3:2 pulldown on your footage the 2 ‘jitter’ frames that you see are a combination of the full (progressive) frames surrounding them. Thanks for the picture as it gives a great frame of reference, rather than trying to guess as to what you are seeing.
What format are you capturing from?
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G5 Dual 2Ghz <> 4GB RAM <> FCP 5.02 <> Kona 2
ATTO 42XS <> Huge Systems 4105 Fibre -
[Rick Sebeck] “Is this just normal fields? Again, its not noticeable on an NTSC monitor until you scale, rotate, or move the image or if you take it into AE to rotoscope and such.”
correct these are fields — but the field order looks reversed on the still posted NTSC video on a mac is lower field first.
[Rick Sebeck] “Another thing I noticed is that it happens in a 3:2 cadence. That is, 3 frames are smooth, two frames are like this. Any footage i bring in via the kona uncompressed ha this distortion”
That 3:2 “pulldown” means that the footage was shot at 24p- the extra frames have been added so that the footage plays at 29.97
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