Questions about AF100's native frame rates

Arash Ayrom

Arash Ayrom

Cataclysmo
Hi,

I have a few questions regarding the AF100's native frame rates, and native frame rates in general. Hopefully, someone can shed some light on these for me.

According to Jan Livingston's AF100 presentation that was made available as a PDF, the camera's native frame rates are 30p and 25p.

My questions, coming from someone primarily interested in shooting 24p:

1. The camera is to be both PAL and NTSC, correct? Meaning, every camera will have two native frame rates. Do I have this right? If so, why can't they have a third native frame rate as well?

2. If I shoot 24p on this camera, that footage will have a 3:2 pulldown inserted to make it 24p wrapped in 60i. Is this correct?

3. If the above assumption is correct, will there be any quality loss when removing the pulldown in post as compared to a native 24p camera?

I'm asking this due to the AVCHD codec, and whether removing pulldown is more complicated/ less clean than something like DVCPro HD.

4. Lastly, again assuming the 24p-in-60i situation, footage will take up more room than if native, right?

I think with DVCPro HD, it's a simple mathematical computation because it's solely spatial compression, so you have a ratio of 2.5:1 (i.e., 60i takes up 2.5x more space than 24p).

With AVCHD, is this ratio the same? I know it's a much more clever codec, so maybe there's a difference?

-----

Thanks for any help! :)
 
Are you certain? I'm going off of this slide from Jan Livingston's presentation:

1286132566.jpg
 
From their website:
1080/60i
1080/50i
1080/30p (over 60i）
1080/25p (over 50i)
1080/24p (Native)
720/60p
720/50p
720/24p (Native)
720/25p(over 50i)
720/30p (over 60i)
 
hoju said:
According to Jan Livingston's AF100 presentation that was made available as a PDF, the camera's native frame rates are 30p and 25p.
Click to expand...

Haven't looked at the slides to see where you made this out, but the native rates are 24P and 25P, at 60Hz and 50Hz respectively. I am not certain that the 30P is native at this point in time, and until I get the next sample I am not sure that I will know for sure.

1
. The camera is to be both PAL and NTSC, correct? Meaning, every camera will have two native frame rates. Do I have this right? If so, why can't they have a third native frame rate as well?
Click to expand...

As answered above 24P is native.

2. If I shoot 24p on this camera, that footage will have a 3:2 pulldown inserted to make it 24p wrapped in 60i. Is this correct?
Click to expand...

No it will just be the 24 Frames
3. If the above assumption is correct, will there be any quality loss when removing the pulldown in post as compared to a native 24p camera?
Click to expand...

In general removing a 2:3:3:2 pulldown would be virtuall the same, but since that isn't necessary, you don't need to concern yourself.


Best,

Jan
Click to expand...
 
Thanks Jan and everyone else for clearing this up!

I'm guessing it was just an error in the document that cited 30p as native.

A very exciting time to be shopping for a camera!!
 
Jan sent me a revised slide to post with her presentation. I am still working on moving the revised slide in and creating a PDF, but until I get that done, here is the one slide that is of interest. Hope this helps clear things up.

Thanks!

1286156644.jpg
 
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