Is 24PN really 24fps or is it 23.98fps?

R

rcjaffe

New member
I'm recording sound on a separate device like a film shoot. I need to know if the 720/24PN mode is really running at 24fps or if its truly running 23.98fps.

If it's 24fps I'll run my audio recorder at 30fps NDFTC/48.048kHz sampling rate so when I pull the video down to 23.98 the sound will stay in sync being pulled down to 29.97/48.000kHz.

If it's recording 23.98fps in camera I'll record audio directly at 29.97/48kHz.

In the end things have to match up with film being telecined and pulled down from 24 to video at 23.98. The final conformed HD master will be 1080/23.98. The 720p will be uprezed to 1080p.

Thanks,
RJ
 
I found this link that kind of answers my own question direct from Panasonic.

http://shop.panasonic.com/webapp/wcs/stores/servlet/prModelDetail?storeId=11301&catalogId=13251&itemId=95592&modelNo=Content12072005012903035&surfModel=Content12072005012903035

How does the HVX200 record 24P?
It shoots every frame as a progressive frame, so it is true 24P (more accurately known as 23.98 fps). In most recording modes, duplicate frames are added in a 2:3 or a 2:3:3:2 pull-down cadence and the progressive frames are divided into two fields in order to conform to existing interlace 29.97 formats. The 2:3 mode follows all of the conventions of film to tape transfer, so that the recorded material can be treated as a film transfer or in the 2:3:3:2 mode it can be extracted for 24 frame editing. In the 720p "Native Capture" mode only flagged frames are captured with 23.98 time code; these files are directly compatible with a 720p 24-frame timeline, and require only 40% of the storage capacity of 720p 60 fps or 1080i HD recording.

Thanks for everyone's help. I hope it works.

RJ
 
I believe 23.98 is just 23.976 rounded up. AfterEffects wants to see 23.976 but the same footage in FCP could be put on a 23.98 timeline. I work at a post facility and we use them interchangeably like that. It all depends on the program you're working in. But it is very different than true 24.

RJ
 
"true" 24p (meaning 24.000 fps) is something that 97.5% of us will never encounter. For all practical purposes, 24p on video always means 23.976 fps.
 
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