Good slow mo shooting 24p a 1/500 or must you use 30p or 60i?

[omar_]

So you can't really get slow motion in post while shooting in 24p? Can someone explain why you must use 30p or 60i as opposed to 24p. Also, Ive seen 60i on 1/500th shutter look better than 30p in slow mo too, but then you lose shooting in the film look.

Also, why does slow mo look better in higher shutters like 1/500th?

Can you get good slow mo shooting 24p a 1/500 or must you use 30p or 60i?

 

[Warren Foster]

Well say you are slowing down your video to 50%. Using 24p footage it would end up being 12 frames a second. Not very smooth. Whereas 30p or 60i would have more frames and end up smoother.

Shutter speed will only just effect the sharpness of each frame. If you slow down the video, allowing more time per frame, the blur will become more visible. At regular frame rates shooting at the 1/100th range will be fine. This is all depending on how fast everything is moving.

 

[Huy Vu]

Well say you are slowing down your video to 50%. Using 24p footage it would end up being 12 frames a second.

Actually, slowing your video down requires more frame, so it would be 48 frames per second. This require your program to start duplicating frames. Therefore, it makes sense that the more frame you have to start with, the smoother the final result will be. Another factor is whether a frame is progressive or interlaced. 30p is actually very poor for slow motion work, because it's progressive and cannot be duplicated well since there's nothing there for the program to interpolate. Because the way interlaced video is recorded (one field and then the other), 60i has more "motion information" than 30p. It's a fairly simple process to split the two fields and make each of the field their own progressive frame, giving you 60p which makes for a great slow motion look when played back at 24fps! Shutterspeed is very important, because like Warren mention, higher shutterspeed results in less motion blurring and thus "cleaner" looking footage when slowed down. I've found that 1/120 is the minimum when shooting at 60i.

 

[Macville]

Actually, slowing your video down requires more frame, so it would be 48 frames per second. This require your program to start duplicating frames. Therefore, it makes sense that the more frame you have to start with, the smoother the final result will be. Another factor is whether a frame is progressive or interlaced. 30p is actually very poor for slow motion work, because it's progressive and cannot be duplicated well since there's nothing there for the program to interpolate. Because the way interlaced video is recorded (one field and then the other), 60i has more "motion information" than 30p. It's a fairly simple process to split the two fields and make each of the field their own progressive frame, giving you 60p which makes for a great slow motion look when played back at 24fps! Shutterspeed is very important, because like Warren mention, higher shutterspeed results in less motion blurring and thus "cleaner" looking footage when slowed down. I've found that 1/120 is the minimum when shooting at 60i.

That's what he actually meant. That If you were to slow down 24FPS you'd get really strobey slow mo and that you need more FPS. That said, 30FPS down to 24P is nice for a very slight slow-mo look. 48 starts to be pretty good. 60 is a good speed and 120 is too slow for alot of work. 29.97 interlaced will give you a better look because it's actually 60 frames a second instead of 30 frames. So with your DVX I would suggest shooting 60i with a slow down of 40% and a deinterlace in a 24P timeline. Always worked good for me.

Matthew