This is one of those appealing magic tricks that we all have seen numerous times in different commercials, music videos, and even some feature films. Combining slow motion, fast forward, and normal speed in the same frame, however, may seem as a difficult and even impossible task at first sight but it’s clearly not.
What’s more, you can use a bunch of different video editing techniques to create the same effect depending on the clip that you have on your timeline. In this particular case, talented video editor Justin Odisho covers three particular methods that you can apply instantly in Premiere Pro CC.
Regardless of which one of those methods you would opt for, you should start off by duplicating your clip first. Once you have those two videos on top of each other, it’s time to mask out a certain portion of the entire frame and adjust its speed separately. Since there is a clear line between both sections of the clip in the first example, you can easily pull this off by using only the Crop effect.
To do so, open the Effects Panel, search for the latter and drag it onto the top copy. Hide the visibility of the lower track to be able to see what you’re doing, and simply crop out the image so that it meets the exact intersection point. Additionally, you can apply some feathering to blend and smooth the effect even further.
Finally, you should alter the speed of either clip by right-clicking on it, choosing Speed/Duration…, and setting the speed accordingly. It may sound obvious, but if you’re planning to mix slow motion with normal speed, it’s highly recommended to shoot your video at a higher frame rate in the first place so that you’ll be able to get seamless results and proper slow motion later in post.
The second and third examples are a bit trickier than the first one, yet the main principle of producing the effect remains exactly the same. You can either utilize the Pen tool to create a Mask and separate both portions of the clip, or pick any of the multiple keying tools available in Premiere Pro CC to combine these two different images.
Plus, you can not only manipulate the speed of different sections of the video and use the above techniques, but you can even reverse either clip for a more advanced type of feel. All in all, the creative possibilities to of these techniques are virtually endless, so take your time and try out each one of them on multiple videos and see what you can get on your own.
[source: Justin Odisho]
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