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Needing answers to interlacing q’s
Are commercial films rendered to DVD as interlaced or progressive?
Why do film DVD’s look so good on both interlaced tv’s and progressive computer screens?
When I render out to DVDA 720×480 widescreen from my HDV 60i upperfield footage/timeline, should the render field be set to upper or lower fields? It defaults to lower field but my project settings are upper. Should they be the same or different for best results.
Should all my pics and media text be set at upper field as well for the best rendering results?
tks for your help,
t.
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10 Replies
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Most films are printed to DVD as progressive, and they become interlaced at either the DVD output or the display.
Commercial DVDs look great because they begin with a very high quality source. GIGO…
MPEG2 for NTSC delivery is LFF. HDV is UFF. Let Vegas manage the difference for you, use the templates or modify existing templates, but don’t mess with field order.
Still images and graphics shouldn’t be assigned fields. Let them remain progressive; field order (or lack thereof) will be assigned by your output template.
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Tks DSE!
Your answers are helping me understand the process. A few more q’s if you don’t mind.
Are all commercial DVD’s mpeg 2 then?
So I should be editing in Vegas with upperfield selected, but leave the DVDA render template to lowerfield?
I was under the impression that graphics should be set to the same field as your project, but I’ll try rendering as progressive.
I’ve noticed that I see horrible interlacing lines on fast moving objects in my footage and on clips that I’ve slowed down in the timeline. Should I deinterlace those spots? Can I intermingle progressive/interlaced/deinterlaced footage on the same timeline?
I also am seeing a significant amount of flickering on footage with grass and gravel(smaller objects). Is this possibly the cameras (HC7) weakness or is it a rendering issue?
tks, t
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Good questions, I would like to see the answer to these too….
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Any standard DVD must be MPEG-2, no variant.
The settings in the project depend on the main source material you use. What, how, why they are, comes only to 1 point: they (are correctly interpretered on the time line and) relax CPU’s muscle, e.g. you have ntsc hdv material but your project is set to pal hdv then the cpu suffers decoding/transcoding all the time and you yourself work also very heavy.
For which field first etc., there’s no relationship between source and your end product. That’s why it calls RENDER AS…
The issues about flickering and so on are big themes that not only amateurs but experters always confrnt. We should learn more, then could solve some of them.
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Tks KB,
So a 24p DVDA render and a rented commercial DVD are all mpeg 2 compression files?
So the Vegas project settings are really just for cpu workflow load and previewing? They won’t affect the way it is rendered then? It doesn’t matter the different formats on the timelines then either?
Is it better to have DV on a seporate track then the HDV track?
Would I be thinking correctly that shooting progressive vs interlaced should get rid of flickering and interlacing issues?
Gosh I’ve got a lot of questions! I’m really enjoying video production but I’m really picky on quality. I’m learning as much as possible these days. I appreciate everyone’s input greatly.
The Cow is great! A wonderful tool I’m on almost everyday.
t.
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[TerryAdrian] “Would I be thinking correctly that shooting progressive vs interlaced should get rid of flickering and interlacing issues?”
24p is still scanned 60 times a second on a crt TV. Flickering is not an issue. Did you mean twittering? -
Could you explain twittering please?
t.
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[TerryAdrian] “Could you explain twittering please?”
Twittering is an interlacing problem – where thin horizontal lines (less height than a scan line) twitter or ‘sparkle’.
Flickering is frame rate problem. Film is shot at 24fps but projected at 48fps. The cadence is aabbccdd, etc. Now some Panasonic cameras record 24pn (exactly 23.94 frames a second) – then the NLE adds redundant frames back in to match NTSC specs. The reason is the same as film – 24fps, by itself, would be unwatchable – too much flicker. And savings – half as much film is used in one case and memory cards capacity is extended in another.
The movement you are seeing in your HDV footage of the grass ‘dancing’ is probably a failure of the Mpeg2 codec in recording – try blurring that section of the picture – that’s about all you can do with it.
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Tks for the explain Ramond!
Seems like almost all of my footage I shoot has twittering in it somewhere. It’s really amature looking when someone’s teeth are twittering when they smile.
I’m thinking I need a better cam that shoots progressive.
t.
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Make sure you don’t have the camera’s sharpness turned up. Turn it off or turn it down and do a test.
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