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Martha Wilson
30fps & 60fps
on Mar 11, 2012 at 1:25:33 pm

I'm shooting a film I'd like to shoot in both 30fps and 60fps. Can I put both frame rates in the same timeline? And have them remain 30fps and/or 60fps?


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Dave LaRonde
Re: 30fps & 60fps
on Mar 11, 2012 at 2:56:12 pm

HOLD IT!

You wrote "film". As in the movies. As in 24fps for actual celluloid frames projected on a screen, or 23.976 (aka 23.98) for movies on TV.

Please clarify your ultimate intent for this project. How will it be played back? What is the destination medium? It makes a big difference in the frame rate at which you ultimately shoot.

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


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Martha Wilson
Re: 30fps & 60fps
on Mar 11, 2012 at 5:30:26 pm

It's an insect documentary. How are sporting events played back? Television, streaming, dvd... Aren't they all shot 60fps? Thanks.


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Bret Williams
Re: 30fps & 60fps
on Mar 11, 2012 at 4:52:33 pm

Well, if you put 60fps in a 30fps timeline you are only going to see every other frame. So that will look slightly odd. Especially on fast motion. You can put 30fps in a 60fps timeline just fine. It will look like 30fps. But it won't look like the smooth motion of the 60fps visuals in the 60fps timeline.


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Martha Wilson
Re: 30fps & 60fps
on Mar 11, 2012 at 5:26:55 pm

I'm filming an insect documentary. The bugs look great at 60 fps per second but I'm a little concerned that interviews might look strange. Then again, this is an insect documentary. What do you think?


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Bret Williams
Re: 30fps & 60fps
on Mar 11, 2012 at 9:25:31 pm

The more frames per second, the better. Television is broadcast at either 720p or 1080i. Both are sixty images per second.

So, if you want to work in a 720p60 sequence, that would cover your bases. The 60p would show as 60p and the 30p would show as 30p. Unfortunately FCP 7 doesn't let you put 60p in a 1080i correctly. It wouldn't map the frames to fields. It would just strip out every other frame. FCP X does perform the operation correctly.


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Thomas Morter-Laing
Re: 30fps & 60fps
on Mar 12, 2012 at 9:35:32 am

"The more frames per second, the better. Television is broadcast at either 720p or 1080i. Both are sixty images per second"

Really? In the UK I'm pretty sure it's 25p or 50i which equates to 25 images per second, and in the US it's 30P or 60i, which are not 60 images per second...I didn't think broadcast was 60p normally.... but I could be wrong.

EDIT- I suspect I AM wrong because Bret you are far more experienced than I am, so hopefully that didn't come across as arrogant or anything, it was a genuine question :)

Tom Morter-Laing
Twitter- @TomTheEditor
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Bret Williams
Re: 30fps & 60fps
on Mar 12, 2012 at 4:34:33 pm

Sorry to forget PAL land. But She was referring to NTSC frame rates in her question.

The US is 60hz. Either 720p60 or 1080i30) I would assume pal is 720p50 or 1080i25.

If it wasn't 720p60, then interlaced material shot or played back would look like it does on a computer monitor. I don't completely understand it, but each field gets mapped to a frame of progressive. The reverse is true if you convert 720p60 to 1080i. Each frame gets converted to a field. Pretty seamless. 24p material simply has pulldown added. There no pulldown that matches up with 30p except repeating every 4th frame which on anything but a lock-off looks like hell.


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