Velocity Envelopes can be used to speed up, slow-down, and freeze video in Sony Vegas. To use a velocity envelope, right-click a video event and choose Insert/Remove Envelope > Velocity. Drag the envelope up to increase the clip speed or down to decrease the speed. Drag it to 0% and the clip will freeze. Setting it to a negative value will cause the clip to play in reverse. Double-click to add anchor points to speed or slow down the clip at different points. Remember, if you speed up or slow down a clip with velocity envelopes, the clip will vary in length and may need adjustments to avoid looping.
Tip: While dragging the velocity envelope hold the Ctrl key to move it in fine increments.
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Robert began making video tutorials on YouTube nearly 12 years ago. Teaching Photoshop and Sony Vegas, he's made over 250 video tutorials helping over 10 million people and has been recognized by Sony. He loves being able to share his knowledge with others and inspiring them to create something awesome.