How much fps are required for smooth slow motion?

[Scaleo]

Hello,

I have been trying to make a ''Twixtor'', but I have encountered a problem.
When I try to make it play in slow motion (under 30% velocity) it gets choppy, though it was recorded at 91 fps in MW2 and 50 to 60 fps in BF3.
Isn't that enough to make it at least run smooth at 25% velocity?
I have seen videos where it was recorded at 60 fps, and they used 15% velocity and 3% velocity while it was really smooth, and my videos are choppy when recorded at 91 fps and using 30% velocity.
I am using Sony Vegas 7 pro.
Can someone help me? .

Thank you for reading.

 

[mad2]

Hello,

I have been trying to make a ''Twixtor'', but I have encountered a problem.
When I try to make it play in slow motion (under 30% velocity) it gets choppy, though it was recorded at 91 fps in MW2 and 50 to 60 fps in BF3.
Isn't that enough to make it at least run smooth at 25% velocity?
I have seen videos where it was recorded at 60 fps, and they used 15% velocity and 3% velocity while it was really smooth, and my videos are choppy when recorded at 91 fps and using 30% velocity.
I am using Sony Vegas 7 pro.
Can someone help me? .

Thank you for reading.

Dont hold me to this but I think since you want 25% speed, you would need to record at 4 times 30fps for smooth video so around 120 fps for very smooth slow motion.

 

[djscribbles]

It could simply be that the slow motion videos that were smooth used post processing to fill in the gaps in between frames, much like a tween, or the way 240hz HDTVs upscale things.

 

[Scaleo]

Dont hold me to this but I think since you want 25% speed, you would need to record at 4 times 30fps for smooth video so around 120 fps for very smooth slow motion.

Okay, but how do people get such a smooth slow motion scene when MW2 can't go above 91 fps?

 

[mad2]

Okay, but how do people get such a smooth slow motion scene when MW2 can't go above 91 fps?

It possible to uncap the framerate of mw2 i believe. Prob a conf file with vsync or something of the sort.