Smoothing slow motion using motion blur – Apple Final Cut Pro 5 User Manual
Page 1100
Chapter 16
Changing Clip Speed and Time Remapping
313
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Note: While clips using frame blending can play in real time at preview quality, frame
blending on a field-per-field basis is much more processor-intensive, and is only
performed when the clip is either rendered or played via a third-party video interface
with real-time hardware processing that’s capable of field blending.
You can make a clip play backward by turning on the Reverse option. Alternatively, you
can enter a negative speed setting.
Note: Frame blending and reverse speed can be applied to both constant and variable
speed clips.
Smoothing Slow Motion Using Motion Blur
While using frame blending is an excellent way to smooth out the apparent motion
of a slow-motion clip, extremely slow speeds such as those below 20 percent can still
result in strobing. To further minimize this effect, you can use the Motion Blur effect
in the Motion tab.
Slide the Samples setting to the right until you achieve the amount of blur you need
to cover the strobing of your clip (the higher the Samples setting, the longer
rendering takes) and then adjust the % Blur setting until you strike a good
compromise between the sharpness of the clip and the smoothness of the motion.
Note: Motion Blur is not a real-time effect, and in fact can be quite render-intensive
at its higher settings. For this reason, you may find it best to adjust the speed and
duration of your clip with Motion Blur turned off, enabling it only for the final render.
To turn off Motion Blur without individually removing it from every clip, you can
deselect the Motion Blur checkbox in the Render Control tab of Sequence Settings.
For more information on using the Render Control tab, see “