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1. Re: Video Basics: Clearification on Nomenclature/Specs
able123 Feb 13, 2012 9:02 AM (in response to prescovidprod)hmmmm
my suggestion is to check out books at your local library and also use google or another search engine to get some of the fundamental info you are looking for... mainly cause you will also get illustrations and graphics that help to " show " you what the text is explaining.
it's not that what you're asking is too hard to answer concisely here... but would take a bit of time and explanation and lead to other questions etc... so that I really think some books and lots of searching on internet would really help you a lot.
For example, if I said to you that some digital video is sometimes related to older FILM cameras regarding terms and adaption... so that it may be assumed at 180 degree film shutter ( that spins near the film gate ) lets light expose the film 1/2 the time, so that 24 FPS means the effective shutter speed is really 1/48th / sec... and that shutter speed determines in part how much the frame gets blurred from "action" .. it may need some illustrations and graphics to really understand what is happening. That shutter speed ( and frame rate combined ) may or may not freeze action to the point where you're happy with slow motion or fast motion playback..
Where 60i ( i = interlaced ) is different than progressive ( 24p p=progressive ) is also best explained with illustration ( for me at least it was very important to see it illustrated )...
You're best off with some basic books with those illustrations etc in my opinion.. and would be faster way for you to learn and use as references for later questions , etc.
good luck
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2. Re: Video Basics: Clearification on Nomenclature/Specs
JSS1138 Feb 13, 2012 9:20 AM (in response to prescovidprod)The convention for long form specs is to list the horizontal resolution, an i or p indicating interlaced or progressive, a slash, and then the frame rate. Like this:
480i/30 - This is normal NTSC video.
480p/24 - This is 'film like' NTSC video.
1080i/30 - One of the ATSC (high definition) standards.
720p/60 - Another ATSC standard.
The shorthand convention is to drop the resolution and slash, and move the i or p after the frame rate. Like this:
30i
24p
30i
60p
Camera makers started confusing the issue by changing the frame rate to field rate, so that the proper notation of 30i got incorrectly listed as 60i. This has caused much confusion.
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3. Re: Video Basics: Clearification on Nomenclature/Specs
JSS1138 Feb 13, 2012 9:25 AM (in response to prescovidprod)Your frame rate choice will be decided by answering one question. Do you want the video look, or the film look? For the former, you'd use a 30i* or 60p setting. For the latter, you'd use a 24p setting.
This applies to any resolution.
*Take note that most cameras incorrectly list 30i as 60i. Technically they do mean two different things, but from a camera settings viewpoint, they mean the same thing.
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4. Re: Video Basics: Clearification on Nomenclature/Specs
prescovidprod Feb 13, 2012 10:18 AM (in response to able123)Thanks all for the speedy reply.
Yes, able123, I am reading everything. It still can be confusing. I understand where 24fps comes from and interlaced and progressive and all that. I just dont understand that when I shoot 60i, and bring it into premeire regardless of the sequence setting (24p or 60i) it still comes in at 29.97.
Now, granted, I am using a cannon vixia hfs10 for now, which wraps the 24p in a 60i package (AVCHD/.mts files), but just not getting why it wont be slower?
I have tried various sequence settings when i open the file, and various export settings when I finish. Still the same result.
That is why i asked about extracting the native 24p from the 60i wrapper the vid camera puts it in.
Jim, thanks also, that explains the nomenclature really well. Ya think the industry could use the same terms? @@&^#@*!!!!
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5. Re: Video Basics: Clearification on Nomenclature/Specs
prescovidprod Feb 13, 2012 10:24 AM (in response to prescovidprod)Correction...Canon Vixia HFS11...(ooooo...big difference....LOL)



