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30p in final cut pro: is it worth it?
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[Russell Lasson] “If you shoot at 30P then you have one complete frame every 1/30th of a second.”
But when the 30P is shown in NTSC, every 60th of a second, you’ll see a field from one 30P frame combined with a field from the next 30P frame. This is one of those things that makes me crazy. In practice, the 30P still looks good, but why bother for NTSC? It looks great in Windows Media. No need to deinterlace.
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Really? Wouldn’t it just show field one of the frame and then field two instead of using a field from a different frame?
(I’m not a 30P expert. I like 24P.)
-Russ
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That doesn’t make sense, Tom. You’d have to have 60p to achieve what you are saying.
30p is still 60i, just that each field in any given frame is identical.
Jeremy
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So a DVD player would just treat 30P like 60i right? No need to use the progressive switch. That switch is just for 24P, right?
-Russ
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Most likely. But it will still display progressive which looks best on all progressive tv sets that a lot of people have today (lcd’s, plasmas, computers, web stuff). It’s worth it to shoot 30p.
Jeremy
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The way I understand it, you have to think in terms of 60i, not 30. Where do those 60i fields come from? Field-1 comes from frame A, Field-2 comes from frame A, Field-3 comes from frame-B. That’s where the interlace look comes in. The problem is that the 60i display is interlacing each field with the next. So those last two fields, taken from different frames will be interlaced. And they look it because they have different motion recorded in them.
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Cool. I will never again shoot at 60i, unless I need to.
-Russ
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[JeremyG] ”
That doesn’t make sense, Tom. You’d have to have 60p to achieve what you are saying.30p is still 60i, just that each field in any given frame is identical.”
Yes, that’s completely true and I get that, but I still see Barry Green’s point that 60i is going to interlace every field with the next field and therefore, fields with different motion will be interlaced.
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You are right, in 60i, each field can be a different point in time in the motion of your subject, that’s where the interlace comes in.
With Progressive sensors, one picture is taken every 30th of a second, and then split into two fields.
Jeremy
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[Dave LaRonde] “Perhaps our JeremyG doesn’t have a broadcast monitor.”
Wow! Those could be fightin’ words! Watch out or Jeremy might just sneak over sometime and unplug your broadcast monitor in retaliation.
-Russ
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