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AVCHD 1080i – video effects and interlacing
Hi,
I’m working with 1080i AVCHD footage which is rendered in Sony AVC (Blu-ray 1080@60i m2ts template) and played back on an 1080p LCD TV.
When I render, I set the de-interlacing to none as the TV is able to perform deinterlacing. With the exception of certain effects such as zooming on an event using track motion, rotate and crop an event using Event Pan/crop. In these areas the rendered footage looks terrible (looks fine in the preview window at Full resolution). To fix it I have to set the deinterlace to Blend Fields.
Is this normal and if so, can someone explain to me why?
Also, if I use Blend Fields deinterlacing, am I loosing quality? Is the footage then deinterlaced twice? (once by Vegas and a second time by the TV?)
I’ve tried to selectively deinterlace only the events with the effects, using the BCC deinterlace plugin and the upper field template but it makes no difference.
Last but not least, if I switch to a 1080@60p camcorder, will these situations be a thing of the past?
Thank you.
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4 Replies
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[Colin Anderson] “When I render, I set the de-interlacing to none as the TV is able to perform deinterlacing.”
Where do you make this setting? What your TV can and cannot do has no bearing on what you tell Vegas. If your footage is interlaced (and it is…) you need to tell Vegas how to handle deinterlacing.
[Colin Anderson] “To fix it I have to set the deinterlace to Blend Fields. Is this normal and if so, can someone explain to me why? “
This is normal and the “why” is because sometimes the video needs to be deinterlaced in order to process it internally. So you must set a method for deinterlacing if your source is interlaced.
[Colin Anderson] “Also, if I use Blend Fields deinterlacing, am I loosing quality? Is the footage then deinterlaced twice? (once by Vegas and a second time by the TV?)”
Once again, this has nothing to do with your TV. Every TV in the world supports interlaced video and will handle it properly. You need to set this properly so that Vegas knows how to handle the fields in the interlacing.
[Colin Anderson] “Last but not least, if I switch to a 1080@60p camcorder, will these situations be a thing of the past? “
That depends on how you deliver your footage to your TV. If it’s on DVD or Blu-ray then the only progressive format that is supported 24p so you’ll introduce other problems.
Even if you buy a 60p camera, you should shoot 30p unless you are doing special effects like slow motion and then only shoot the slow motion scenes in 60p. There is currently no way to deliver 60p footage as it’s not in any of the standards for TV delivery so you’ll be doing further conversions to meet the TV standards.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
I have a Panasonic TM-700 that shoots 1080 60p. It does not capture 30p, just 60p and four diverent bitrates of 1080i and Cinima mode which is the 24p. But you can shoot in 60p and render to 30p very easily, and there is no interlacing do deal with, just 60 perfect pic per frame. You’ll need an i7 to edit AVCHD smoothly, wheather its 1080i or 60p.
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Hi John, thanks for replying.
I set the deinterlace mode in the project properties along with the field order. I was under the impression that you only needed to deinterlace when you viewed the rendered footage on a progressive only display, like an LCD monitor. Thought I read that somewhere. But reading the passage in the Vegas manual again made me realize that it also tells Vegas how to render effects.
Thanks
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[Colin Anderson] “I set the deinterlace mode in the project properties along with the field order. I was under the impression that you only needed to deinterlace when you viewed the rendered footage on a progressive only display, like an LCD monitor. “
It’s pretty simple. If you use interlaced footage, you MUST select a deinterlace mode other than None.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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