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Spot jitters (field dominance question)
I just submitted my first TV spots using Vegas, and one of the stations threw up a flag; evidently there was some jitteriness when played back on their play-to-air device.
Here’s the comment I got back: “The spots are compressed wrong. The video is interlaced and the GFX are not and it was compressed not matching the field dominance.”
They’re SD spots using the default settings for 720×486, 29.97 in Vegas. The only thing I can think of that might point to the comment above is that the spots have interlaced camera footage from tape mixed with overlayed pre-built animated graphics rendered in frames, but that’s never been an issue (with the system I used before moving to Vegas).
Would rendering the animated graphics in fields fix whatever’s going on? I kinda thought a Vegas render output would make everything peachy (and the spots look good as final MOV/H264 files)??
Thanks,
–Kelly
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7 Replies
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It would help if you told us what your project settings are, including your Deinterlace Method. We’ll also need to know the exact render type and template name you used and any changes you may have made to it.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Project settings are:
NTSC Standard (720×486, 29.970 fps)
Field order: Lower field firstI rendered as the Vegas “Default Template (uncompressed)”. I do notice now that its settings are defaulted to “Field order: None (progressive scan)”. Should I change either my project settings field order to progressive scan or my render settings to lower field first? Could that be the issue?
Wondering, too, if the pre-built graphics clips are still okay as full-frame renders or if I should re-render them in fields as well, or if that even matters (?)
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If they were expecting interlaced video and you sent progressive video, that may be part of the problem. You still didn’t tell us what your Deinterlace Mode is set to. This will affect how the video is processed.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Sorry John… that’s set to “None”. And, I’m not even sure what De-Interlace does, and why I’d want to de-interlace if I have interlaced footage (?)
Regardless (and I’d love to know about it), what should it be set to, and in what circumstances would I use “blend” or “interpolate” (sorry, I’ve never had that option before)?
–Kelly
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[Kelly Griffin] “Sorry John… that’s set to “None”. And, I’m not even sure what De-Interlace does, and why I’d want to de-interlace if I have interlaced footage (?)”
You just rendered interlaced footage as progressive which requires deinterlacing but you set deinterlace to None so you made a mess. This is what they are complaining about. You sent them a progressive file full of interlaced lines.
[Kelly Griffin] “Regardless (and I’d love to know about it), what should it be set to, and in what circumstances would I use “blend” or “interpolate” (sorry, I’ve never had that option before)?”
You always want to set you deinterlace method to Blend Fields unless you have a good reason to set it differently. A good reason would be that you have very fast action and even Blend Fields can’t correctly deinterlace then you would use Interpolate Fields. You never want to use None unless you are specifically using a 3rd party deinterlacer.
What format did they want the video in? What were their specific specifications?
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Thanks very much, John.
So, if I go “Lower field first” on project properties, with “Blend Fields” on de-interlace method, and “Lower field first” on the render setting that should be the ticket?
–Kelly
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[Kelly Griffin] “So, if I go “Lower field first” on project properties, with “Blend Fields” on de-interlace method, and “Lower field first” on the render setting that should be the ticket?”
Yes, that should fix the field order problem.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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