Variable Frame Rates

[inthedark]

Thanks for everyones help in the past! i was just having some trouble regarding framerates. When i want to switch from the film look 1080 24p to slow motion i switch the recording format to 720 60p. When i put the 720 in a 24p timeline, it appears normal speed and i still have to slow it down. I was wondering if i was doing it wrong or if i should be achieving slo-motion through a different process such as overcranking or other ways im not very familiar with. Thank you!

Hpx170

 

[David Jimerson]

You want the Recording Format to be 720p/24pN and then make the frame rate 60 in the Scene File.

 

[inthedark]

okay thank you. what is the significance of pn over p is there any critical difference?

 

[David Jimerson]

Big difference. The pN mode records only the frames shot, so everything you need is already done for you (in this case, the footage will be a 23.976 file and will already be in slo-mo). The P mode records everything in a 60p stream, and you have to manually remove frames.

Be aware, though, that shooting variable frame rates in pN mode means you won't record sound with it.

 

[inthedark]

alright so when i wanna do fast sports scenes ill set it to 720 24pn and crank the frames to 60. and for the rest of my shots i use 1080 24p, but i notice horizontal lines whenever theres movement in the shot. Should i be cautious when using 1080 24p?

 

[inthedark]

im confused as to what the difference is of slowing down 720p 60p to 40% or shooting the way you said.

 

[David Jimerson]

alright so when i wanna do fast sports scenes ill set it to 720 24pn and crank the frames to 60. and for the rest of my shots i use 1080 24p, but i notice horizontal lines whenever theres movement in the shot. Should i be cautious when using 1080 24p?

Are you using FCP?

You want to shoot 24pA and not 24p standard, and then import the clips with pulldown removal. Then, you won't see the lines.

 

[David Jimerson]

im confused as to what the difference is of slowing down 720p 60p to 40% or shooting the way you said.

If you shoot 24pN with a frame rate of 60 in the scene file, the footage will already be slowed down. The camera does it for you. If you play it back in the camera, you'll see it's already slo-mo.

 

[inthedark]

Yes i use final cut pro, alright ill try that. Ok that makes sense thank you!

 

[wolf1200]

Thanks for the info David, i was just wondering the same thing.

 

[David Jimerson]

In pN mode, in this scenario, the camera shoots 60 fps. Watching it in the LCD or viewfinder, it looks just like normal 60 fps video. However, when it's recorded, what the camera does is take each 60 fps frame and lay them down at 24 fps, recording them as 23.976 files. The effect is exactly the same as projecting film shot at 60 fps at 24 fps.