Shooting for Twixtor

[Chad Carlberg]

I don’t know the camera system, but if your camera shoots 60 progressive frames per second, you’re not doing any time remapping, you’ll edit in a 24frame timeline and those 60 frames will happen sequentially, slowing you down to exactly 2.5 (24+24+12=60) times real time. This is the way to go unless you want to slow it further.

[Pierre Jasmin]

not sure, it’s maybe true for 60 to 30 but not to 24.
going from 60 to 24 ends up with 2/3/2/3 patterns (jump 2 frames, jump 3 frames, jump 2, jump 3)
60 FPS: [0][1][2][3][4][5][6][7][8][9][10][11]
24 FPS: [0][2.5][5][7.5][10]
which in effect will be (I forget if nearest is before or after when 0.5 in FCP)
so something like frame 0,2,5,7,10,… from the source on the 24p timeline
which is not necessary a pleasant effect on footage with a lot of motion, particularly that at 60 samples per second to start there won’t be any Motion blur which would help to remove the stuttering.

Yes you can do frame blending for frame 2.5… but at that point you probably do better with Twixtor calculating the dot 5 frame…

aside the issue that FCP conforms you on input to your settings, so if you try to edit 24P it will read only 24 FPS from the 60 FPS

pierre

[Chad Carlberg]

That was all very confusing. The reality is this: I know from a lot of PRACTICAL experience that shooting 24PN with a frame rate of 60FPS gets you EXACTLY 60 whole frames per second, which, when added to a 24frame timeline gives you PRECISELY 2.5x slow mo. 48 gives you 2x, 36 1.5x etc.

Just try it. Waste less time. You’ll see that I’m right. There’s no interpolation involved. Period.

p.s. when you are shooting slow-mo, always shoot PN. When you want to shoot the effect of 12fps, shoot it 24P. Shooting 24PN will give you 2x speed rather than frame double.

[Pierre Jasmin]

Ignore the camera for a second,
Say you render in AE at 60P (60 full frames per second) an animated counter that changes of a value at each frame (1,2,3,…) as a quicktime movie, and you import that in FCP in a 24P project it will and can only skip some frame (unless you intermediate to still image sequence – then of course it will be 2.5 slow mo on load).

[Chad Carlberg]

Ignore Pierre for a second,
Skip After Effects. Shoot 24PN at 60frames. Import p2 from FCP. Watch it in a 24P sequence. No render. perfect 2.5x slow. It will cover 60 frames exactly.

Just for kicks, import it into a 60fps timeline, it will be exactly one second.

p.s. Pierre obviously knows 10,0000x more than I. I’m not even placating him; that’s true. But this is one thing that I know very well. I do it for a living. My company is Slow Motion For a Living With FCP and HVX200, inc.