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Filter Duration in Apple Motion

Setting in and out points for filter effects By Dave Nagel
You want to apply an effect to some footage, but not over the entire duration of the footage. In most programs, you can do this by keyframing multiple parameters to get your effect to cut in at the right time, or, in the case of some filters, you can give the effect a negative pre-roll value. Both methods can be cumbersome. But Apple's Motion makes it a bit more simple, allowing you to set the in and out points of an effect just as you can with any other type of object. Here's a collection of tips for Motion that should help you work more easily with filters and get your effects work done just a bit more quickly.

Adjusting in the mini-timeline
To begin, place a piece of footage into your project. Then, from the FIlter Library, drag any effect onto your footage. (This can be one of the stock filters or any third-party plugin that Motion supports.) I'll use BCC Displacement Map from the Boris Continuum Complete 3 package.

Now select your filter in the Layers palette.

At that point, you'll see the mini-timeline change to purple to indicate that a filter is selected, and you'll see the label change to the name of your filter.

At this point, you can click and drag on the purple bar to adjust the in and out points of your effect simultaneously while maintaining the duration of the effect.

Or you can grab at the beginning or end of timeline to drag the in and out points independently. This will also affect the duration of the effect, so that it may be longer or shorter than your actual sequence, depending on what you want. (For example, you might want to set the in point to a negative value to pre-roll a build-up effect, or you might want to set the in point to a positive value to prevent the effect from showing up at all before a given point in your sequence.)

A pop-up text dialog dynamically shows you exactly where your new in and out points will be, as well as the new duration of the effect.

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Related Keywords:apple motion, filter, mark in, mark out, duration, keyframing

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