velocity envelope and slow motion effect

mitteg wrote on 8/9/2002, 2:31 PM
Hello!

I'm a Adobe Premiere user, but I came across VV and I must admit that it's better than Premiere!! I'm having a problem when trying to make a slow motion effect. Can I only accelerate the video to 300% ? This is not enough most of the time. I need to change the speed of the clip 4 times and finally speed it up to 700% at least ! How can I do it with VV3.0 ?

This is my first post in this forum. Thanks in advance !

Regards,

Robert from Spain.

Comments

SonyEPM wrote on 8/9/2002, 2:41 PM
Time stretch the event (crtl+drag the right edge) and add the velocity envelope to the same event. This will allow you to speed the thing up to 1200%.
Shredder wrote on 8/9/2002, 2:59 PM
oops, SonicEPM beat me to it

Firstly, you say you're trying to do a slow motion effect, but then state that you can only accelerate the video to 300%, so I'll attack both angles.

Slow motion: Piece of cake, as the velocity envelope can slow down to 1% so that should be fine.

Acceleration: 700% doesn't seem to be currently possible with just a velocity envelope.

You can do something like this by time-stretching the event (hold CTRL while resizing), which will let you alter the speed between 1/4x & 4x

You can then use a velocity envelope on top of that, to inrease the 4x another 3x, 12x total. I was able to play a 60sec clip in 15 sec by stretching, and then by adding a 300% velocity envelope play it in 5 sec (12x)

Since the velocity envelope can slow the clip as well, you could still use it to achieve the range of 100% - 1200% by ranging the envelope between 25% & 300%

- Jon
Shredder wrote on 8/9/2002, 3:25 PM
I tested this theory & it didn't work as expected. I stretched the clip to 400% speed, and then added a 25% velocity envelope, theoretically restoring the speed back to 100%.

I lined up the original clip underneath the speed altered one & they weren't aligned, the speed altered clip was 13 frames slow for every 15 seconds of video.

I tried 24% but that was too little & 26% was too much.

Is my math faulty?

- Jon
SonyEPM wrote on 8/9/2002, 4:00 PM
What are you trying to do Shredder, keep us honest?

I hope you can live with us calling it an oddity, something that we'll look into at some point in the future when we have some time. You aren't running into some real world problem because of this are you?

Shredder wrote on 8/9/2002, 4:23 PM
No, I'm not running into a real world problem due to this. I often like to do 'sanity checks' on the software I use. I work for a software company & it's usually the really obvious things that everyone assumes will work that are often broken, since those things are rarely double checked. The problem is that those incorrect assumptions can be the foundation of a much larger thing that breaks in the long run.

I can live with an oddity (God knows my wife does)... Go fix the real pains in the butt, like the really annoying Audio Resample Quality setting not sticking for new projects!

- Jon
SonyDennis wrote on 8/9/2002, 5:46 PM
I just tried it and it is EXACT.

Did you set the 25% velocity envelope using a mouse drag or a context menu "set to" command? Because if the former, it might be 24.6% or 25.4% and just rounding to the nearest integer for display.

///d@
Shredder wrote on 8/9/2002, 5:56 PM
Nope... I did a mouse drag. Considering that you can't zoom into the track enough to ever see decimal velocities, can the feature be changed so that if you set it by sliding the line, that it is truely set to whatever is displayed? in that case it's simply an integter snap.

It's more intuitive that way.

(Not that it's that big a deal in any case)

Problem solved...

- Jon
SonyDennis wrote on 8/10/2002, 12:36 AM
I see your point, let me think more about it.
///d@