Creating a Variable Speed Effect
Variable Speed effects involve changing the rate of playback to achieve fast-motion or slow-motion effects. The Avid editing application creates slow-motion effects by duplicating frames in the original media. It creates fast-motion effects by eliminating frames from the original media.
To create a Variable Speed effect:
| 1. | |
(Option) If you require a fixed duration for the clip based on a segment
in the sequence, mark the segment in the Timeline with IN and OUT
points.
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| 2. | |
(Option) If you want to use only part of the source clip for the motion
effect, mark IN and OUT points in the Source monitor.
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| 3. | |
In the Source monitor, click the Motion Effect button.
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| 4. | |
Select the Variable Speed option.
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| 5. | |
Specify the play speed for the Variable Speed motion effect by doing
one of the following:
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Type a number of frames in the Frames text box.
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Type a frame rate in the FPS text box. To indicate reverse motion,
enter a negative number for the play rate.
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Type a percentage of the current play rate in the % Speed text box.
To indicate reverse motion, enter a negative number for the
percentage.
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Select Fit To Fill to automatically set the Variable Speed
parameters so that the duration of the motion effect will match the
IN to OUT duration marked in the Composer monitor.
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To create similar effects, see the following:
| 6. | |
(Option) If Original Preference is set as the Motion Effects Render
Using option in the active Render setting, select one of the following
four available options:
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Duplicated Field — The Avid editing application creates the
effect using one field.
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Both Fields — The Avid editing application creates the effect
using both fields.
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Interpolated Field — The Avid editing application creates a
second field for the effect by combining scan line pairs from the
first field in the original media.
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VTR-Style — The Avid editing application creates a second field
for the effect by shifting selected video fields of the original media
by a full scan line. This technique is similar to that used by high-
quality professional video decks when playing footage at less than
normal speed.
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| 7. | |
(Option) If a specific motion effect type is set as the Motion Effects
Render Using option in the active Render setting, The Avid editing
application automatically selects that type in the Motion Effect dialog
box, makes all other types unavailable, and displays the Ignore Render
Setting check box. For example, the following illustration shows that
Both Fields has been selected as the active Render setting.
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If you want to override the Render setting, click the Ignore Render
Setting check box, and then select one of the four options.
| 8. | |
Complete the effect by doing one of the following:
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Click Create to create the new clip and close the dialog box.
Another dialog box asks you to select the bin for the effect.
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Click Create and Render to render the clip — creating new media
files — and close the dialog box. Another dialog box asks you to
select the bin for the effect.
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A new clip appears in the Source monitor and in the current bin. The
clip has the original clip name followed by the frame rate in
parentheses. You can then edit this clip into your sequence as you
would any other clip.
