How much fps are required for smooth slow motion?

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.
4 answers Last reply
More about required smooth slow motion
  1. Scaleo said:
    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.
  2. 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.
  3. mad2 said:
    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?
  4. Scaleo said:
    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.
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