progressively speed up footage

[Mike Kujbida]

If it’s Pro 9, use a velocity envelope to gradually speed it up.
This envelope only goes up to 3x so save the event as a veg file, import it and speed it up more.

[Michael Bushell]

Hi Mike

Thanks for the quick response!

The event velocity envelope seems to only be for video, yes? How can I speed up audio and video progressively in sync?

Mike

[Carlton Rahmani]

There’s actually TWO ways you can do it, using them in sync–at the same time–you CAN increase the velocity BEYOND 5x.

Actually, you don’t even have to use the velocity envelope: All you have to do is click at the end of the clip, then, pressing ‘ctrl’, ‘shrink’ the clip down as far as you can take it. If you don’t press the ctrl button, you’re just trimming the clip down to a certain point; but with ctrl, you’re squeezing the video (and accompanying audio) into a shorter timelength. I just did a test with this, and was able to take a roughly 60-sec clip and shorten it down to about 15-seconds, which, if you do the math, is 4x increase in speed.

If you add on the velocity envelope, you can increase the speed of this clip an extra 300-percent. The clip that began at originally 60-seconds is now five-seconds long, and complete.

I don’t think that the velocity envelope can be applied to the audio–remember that ‘squeezing’ will–but there are ways you can work around this, such as exporting the audio you’ve accelerated through squeezing, export it as a wav. (or some other audio-only format), then reimporting this and try and line it up with the video that you’ve sped up using a velocity envelope but squeezing the NEW audio clip down to the desired length.

(I know I’m making this sound more cumbersome than it actually is. . .)

The thing about the velocity envelope is that you can apply several difference speeds to a piece of video throughout its length. So you can begin with the video at normal speed, then have it go to a higher speed, then freeze it on a single frame–if you set the velocity at that point at zero-percent–or whatever else you want to do. Only, you have to make sure you set enough nodes to maintain a constant speed throughout the desired section. Meaning, if you want one part of the clip to be a steady 100% velocity, then the next part 200%, you have to make sure that you set a node at BOTH ends of the area that you want to be 100%, THEN another node at the 200% point. . .otherwise, the video’s speed will gradually increase from 100 to 200-percent from one determined point to the next.

Also, it is not a sin to take the same piece of video and duplicate it, then have one clip set at one speed, and attach the second piece on at the place where you want to have the speed change.

Overall, it’s completely possible, and not too hard to do. Yes, this sounds a little complicated, but mess around with it and see what you come up with, and how easy it is. Messing around is how you learn.