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The 720p template isn't 59.94fps

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Jason BrownThe 720p template isn't 59.94fps
by on Dec 14, 2009 at 1:24:46 pm

I'm still trying to understand this...so the question may be a bit naive.

In another forum I was discussing HD resolutions and someone mentioned that 720p standard was 60 FRAMES per second (59.94). If this IS the case, why is the default template for 720p have the frame rate as 29.97.

-Jason


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Brian CharlesRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 2:12:09 pm

A frame rate of 59.94 (or 60i) gives you 60 interlaced fields or 29.97 fps.

I think the confusion arises due to how many video cameras report their frame rates, many of those that shoot 24p are still recording this as 60i.



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Dave LaRondeRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 4:09:36 pm

What happens when you drag the footage in question onto the Make Comp icon at the bottom of the AE project window? Check the comp settings after you've done that.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Kevin CampRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 4:21:06 pm

i'm not sure why the default frame rate for 720p isn't 59.94 in ae...

sure, you can have 720p30 and 720p24, but i can't think of any reason you would use either of those. if you wanted to work in 30 or 24 fps, then you'd should be working with 1080p. then you'd get 2x the resolution per frame. the biggest advantage of 720 is the higher frame rate.

in short, just create a 720p60 comp preset and use that (that's what i do), unless you have footage that is not 60 fps.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Jason BrownRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 4:37:36 pm

I fully understand how to create a comp with the correct frame rate.

I get the fact that (as I'm told) 720p video *can* run at a video FRAME rate of 60 frames per second.

What I don't get is why AE's template for 720 is 29.97, NOT 59.94.

Everyone who I know that is shooting 720 @ 60fps uses it in a 29.97 comp so it plays back footage in slo-motion.

I just wanted to make sure that I understood things correctly and this is an oversight or slightly incorrect on Adobe's part to have the *standard* template set correctly.

Thanks Kevin!

-Jason


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Todd KoprivaRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 4:56:36 pm

If you think that something is wrong, or if you want something done differently, then the best thing to do is to tell the After Effects team directly.

Yes, we actually read those.

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Todd Kopriva, Adobe Systems Incorporated
putting the 'T' back in 'RTFM' : After Effects Help on the Web
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If a page of After Effects Help answers your question, please consider rating it. If you have a tip, technique, or link to share---or if there is something that you'd like to see added or improved---please leave a comment.


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Jason BrownRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 6:33:43 pm

I have no idea if it's right or not...that's what I'm trying to figure out.


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Dave LaRondeRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 7:00:34 pm

Y'know, I'm not certain if an AE composition can display the time as 59.94. It can display as 24, 30, 30 Drop Frame (aka 29.97), but 59.94? I dunno.

Have you tried simply stepping through that 29.97 comp one frame at a time? Have you noticed that the timeline cursor stops on HALF-FRAMES? If so, the footage is 59.94, but the timeline isn't DISPLAYING the seconds and frames as 59.94.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Jason BrownRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 7:28:17 pm

To clarify Dave,

I don't have footage at 720 60p. I'm trying to understand (as people are telling me) that 720p has a FRAME RATE of 59.94. If that is the case, I'm trying to figure out how you would work with it in AE. I'm just trying to wrap my head around it...I don't have a specific issue.

-Jason


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Joey BurnhamRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 6:27:51 pm

[Jason Brown] "What I don't get is why AE's template for 720 is 29.97, NOT 59.94."

Cause they are the same thing. 59.94 is 60 interlaced FIELDS per second and 29.97 is 30 interlaced FRAMES per second.

There are plenty of articles on why this is but when HD was first coming out there was a lot of confusion out there and some things just stuck.


[Jason Brown] "
Everyone who I know that is shooting 720 @ 60fps uses it in a 29.97 comp so it plays back footage in slo-motion."



They are shooting progressive, no? Different ballgame.

Joey




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Jason BrownRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 6:43:16 pm

Either I'm missing something...or someone is wrong. Please read this post from the Cinematography forum:

http://forums.creativecow.net/readpost/54/858345


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Kevin CampRe: The 720p template isn't 59.94fps
by on Dec 14, 2009 at 9:56:14 pm

if you have an hd camera, and you shoot 720p60, you will get 60 unique frames every second. they will each be progressive frames, not interlaced or doubled. i have used 720p60 footage in ae and i can tell you that this is the case, 2 of the stations i work with broadcast in the 720p standard.

if you were to drop the footage into the 720 ae comp preset, it will skip every other frame, not slow it down. you could slow it if you changed the interpret footage settings from 59.94 to 29.97 or time stretched it in the timeline by 200%.

the 720p30 comp can be rendered out as 59.94 if you set it that way in the render settings and the render should usually produce 60 unique frames per second... but why not just work with a 59.94 frame rate comp to start with.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Jason BrownRe: The 720p template isn't 59.94fps
by on Dec 20, 2009 at 2:16:25 am

Thanks Kevin for the clarification.

[Kevin Camp] "but why not just work with a 59.94 frame rate comp to start with."

I was pretty much asking that in the same terms of "why doesn't adobe set the standard frame rate of the 720 template as 59.94"

Thanks again for the information. This makes MUCH more sense to me now.

-Jason


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