How To Slow Down Audio In Sony Vegas, How Speed Up Or Slow Down Your Videos

Method 1: Change Playback RateMethod 2: CTRL-TrimMethod 3: Insert Velocity EnvelopeMethod 4: Slow Motion Effect

Sometimes you just need a change.

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In this case, we mean a change in speed! Many movies utilizeslow motionfordramatic effector tomake action sequences cooler and more intense.Others usefast motionto give the impression oftime passingor forgoofy comedylike old-style Keystone Kops movies. Whatever the reason you want to change your playback speed,VEGAS Prohas you covered with arobust toolset for slowing or speeding up video. You can go even further bymaking time runs backwards for playful and dramatic effect.

In this tutorial, we’ll first cover somegeneral concernsabout changing playback speed. Then, we’ll get into thetools available in VEGAS Pro. We’ll follow these steps:

Method1:Change Playback Rate


Method3:Insert Velocity Envelope

Method4:Slow Motion Effect

When we’re done, you’ll have agreat understanding of how to slow or speed up footage in VEGAS Pro. Read on to find out more!


When slowing or speeding up footage,it’s always a good idea to remember what video is. Video is agroup of still pictures played back in rapid succession to give the illusion of movement. When slowing or speeding up footage, youchange the rate at which the pictures are playedback, so it can havebig consequences on the smoothness of the motion.


Slowing Down Footage

When you slow footage, you’re slowing the rate of pictures running past your eyes.Each individual picture stays there longer, sothe slower you go, the more of a chance that the lingering pictures might start to look staggered and choppy. This is especially true of slower frame rate footage like24 or 25 fps(and to a lesser extent, 30 fps).It’s often difficult to get good, smooth slow motion from lower frame footage.Higher frame rate footage like 50 or 60 fps or higher has less of a chance of seeming choppy, depending on how much you slow it, but it also has the potential for the same thing.


Speeding Up Footage

Speeding up footage is much less of a concern.Many professional-level cameras offer variable frame rates, meaning you can create slow motion or fast motion directly in the camera and there’sno need to slow it down or speed it up in post.If you’redealing with it in post, you’re most likely dealing with normal footage of a standard frame rate, like 24p or 30p or 60p, and you’ll have to keep the above concerns in mind.

Planning ahead helps

The best way to achieve a speed change, especially slow motion,is to fit the new effective frame rate of the footage evenly within the frame rate of the project. In short, you want the new speed of the footage to result in whole frames being displayed.A standard method of achieving good, smooth slow motion in a 24 fps project is to shoot 60 fps and then slow it down to 24 fps in post.This works well because if youslow 60 fps 2.5x, or 40%, the effective frame rate is 24p. Soeach 60 fps frame matches a 24 fps frame on the timeline, and there’s no need to drop frames, interpolate frames, or resample frames. Each frame is used whole, so the result is glass-smooth slow motion. The same is true if you slow 30 fps down to 80% playback in a 24 fps project. The result is milder slow motion, but it’s also perfectly smooth. It’s definitely much smoother than you would be able to get slowing 24 fps footage.

Changing Speed Methods in VEGAS Pro

Most of the methods for changing speed in VEGAS Pro involve resampling frames. Simply put, VEGAS Pro analyzes and blends existing frames for intermediate steps between frames. It makes new frames byblending old ones together. This canresult in double-images or ghosting in frames, but it’s necessary to achieve changing playback speeds.

If you use the method above ofslowing 60 fps or 30 fps footage in a 24 fps project, youdon’t want resampling, you want whole frames. So in that instance, disable resampling. More on that in a bit.

Interpolating frames means creating whole new intermediate frames as if they were recorded by the camera in the first place.There’s no blending of frames, so there’s no double image or ghosting, and each frame is crisp. As we’ll see later, theSlow Motion effect utilizes this technique for smooth slow motion.


VEGAS Pro offers a number of ways to speed up or slow down footage. We’ll take them in order of sophistication.


Method 1: Change Playback Rate

Thesimplest and most precise way to speed up or slow down motionis tochange its playback rate in the Media Properties. This method makes it especially the kind of smooth slow-motion we described above, as we’ll see in a moment.

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Drag a video clip to the timeline. When the pop-up box asks if you want to conform the project properties to the media properties, click Yes.

Right-click the video event. ChooseProperties. In the Properties box, note thePlayback Ratetoward the bottom. At default, the Playback Rate is 1.000, or normal speed.

Click the up or down arrows next to the Playback Rate value. The playback rate changes in increments of .001. This is useful if you want to make very subtle changes in speed, such as when you’re using PAL-framerate footage in an NTSC-framerate timeline, and need to conform the footage just enough to fit. For noticeable speed changes, an increment that small could take all day, sojust type in a number. For example,2.500 speeds up footage 2.5x, while.250 cuts the playback to one quarter speed, or a 4x slowdown. Themaximum speed value allowed is 4.000, or a speedup of 4x,and theslowest value allowed is .250.

Changing the Playback Rate, you can speed up or slow down the footage by as much as 4x.

Choose 4.000, speeding up the Playback Rate 4x. On the timeline,note three things about the video event.

The video eventhas not changed length, but it now hasthree loop points. The 4x speed increase means theduration of the video is now ¼ of what it was, but because the video event did not change length on the timeline, VEGAS Pro looped the media back to the beginning. It did it three times, and as a result, the video plays four times in the span of the video event.

Within the video event, there’s awavy line, indicating that the speed has changed. Themore you increase the playback rate, thetighter the wavebecomes. If you slow the playback rate, the wave becomes much wider.

✓Note also thatthe audio event is unaffected. The audio did not increase speed and VEGAS did not loop it. Click the left edge of the video event and press Play. The video plays back at 4x speed, but theaudio plays back at normal speed and is not syncedto the video.Click Ignore Event Grouping.

You can simplydelete the audio event. Select the audio event and press delete.

Or you canconform the audio to the video. First,trim the video so it no longer repeats. Select the video event andtrim the right edge inward until it snaps at the first loop point. Then,holding CTRL, trim the right edge of the audio event until it snaps at the right edge of the video event. As you trim,the audio waveform compresses, and when it’s snapped into place, the audio is sped up and isnow synced with the video event. We’ll explore a bit more about CTRL-Trim in a later step.

✓Theprocess works for slowing videoas well, just in reverse. Drag another instance of the same video clip to a later point on the timeline. Right-click and choose Properties.Type a value of 0.500 into the Playback Rate, cutting the playback speed in half. On the timeline, the video event has not changed length, but a wider wavy line is displayed on the video event. Again, the audio event has not changed. With Ignore Event Grouping still activated,trim the right edge of the video event to the right until it snaps at the loop point. The length of the video event is now doubled, but the entire video clip is now displayed.CTRL-trim the right edge of the audio event and drag it to the right until it snaps with the end of the video event. The audio waveform stretches out, and the audio is now slowed and synced with the video.

Now let’s look atslowing 60 fps in a 24 fps timeline. Create a new project. This time,set the project properties to a 24p project, using a template or just changing the project frame rate to 23.976 and the Field Order to None (Progressive).Drag a 60p clip to the timeline. When the pop-up box asks if you want to conform the project properties to the media properties,click No.

Right-click the media event and choose Properties. Next to the playback rate, a box appears which saysConform to Project Frame Rate.

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Click the box.


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