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Combustion 4 Everyone Part 4: TimewarpTime remapping made easy
Combustion 4 now includes Timewarp, a fully functionally time-remapping operator that has the ability to keyframe time changes. With Timewarp you can speed up, slow down, freeze, or even play footage backwards cleanly and easily. If you are familiar with time remapping in other applications, then this feature should be easily recognizable. If you are not familiar with this concept, follow along to see how it works.
Step 1: Create a new workspace and import a video clip that has a great deal of motion and apply the Timewarp operator to the clip. The graph in the Timewarp Controls panel has a dotted line that represents the speed of the clip and a solid line that represents time.
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The Y-axis of the Timewarp graph represents speed. By default your speed line should be flat at 100%. The X-axis of the graph represents time. Since the clip progresses forward at a constant rate the line progresses upward.
In order to manipulate time (speed up, slow down, etc.) you place control points on the time (solid) line. The easiest way to create speed changes in your footage is to first place control points, and then manipulate the curve. Lets say, for example, you want your clip to play at normal speed for two seconds then the speed drops to 50% for one second, before returning to normal speed for the rest of the clip. In this example, I am using a clip from Artbeats.
Step 2: Place a control point at 2:00 on the time graph, move to 3:00 on the time graph and place the second control point.
You will notice the control points on the graph have Bezier handles. Use these handles to control the curve of the speed graph. By default the handles are joined, but you can break the handles for more precise control by first holding the Control key then clicking and dragging the appropriate handle.
Step 3: In this example, select the first control point you created, break the handles (by holding down the Control key) and adjust the right handle until the tangent drops to 50%.
Step 4: Select the second control point you created, and click and drag the entire control point down until the incoming curve flattens out.
Step 5: Continue to adjust point position and Bezier handles until the graph represents the motion changes you want.
Experiment with speed graph control points and the Duration amount to create a clip that plays forward, stops for a few seconds, reverses time and even changes its length.
If the speed curve is equal to 0% then you have created a freeze frame. If the curve drops below 0% your clip will play backward. If the curve is greater than 100% the clip will play faster in the Timeline.
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