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Velocity Envelope Workflow

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Joshua Jackson
Velocity Envelope Workflow
on Sep 12, 2017 at 2:00:03 am

Hello...
I'm having a really hard time figuring out velocity envelopes.
I'm working on a motorcycle video and I'm wanting most of it at 10x speed, slow down for a portion, and then speed up to 4x or so.

I've done other videos where I use the ctrl+drag method to change speed.
It works exactly as I would expect, but it has no affordance to changing those speeds.

I have my timeline set up at 1x speed, markers are placed in key areas, etc...
I have a couple velocity anchors, where I want to change from 10x to 1x.



When I drag the beginning up to 10x, I see the little notches that say looping is happening.



You'll notice that the play head is not where it was, before increasing the velocity before the play head.
It seems natural, to me, that nothing would change after the 1x point.

Instinctively, I drag the beginning of the clip to the right (to shrink the clip to the point where I want to go to 1x).
Unfortunately, it moves the envelope points and now 1x doesn't start where I intend it to start.



Obviously, I'm just not understanding how this works.
I even tried slicing the clip at the 1x point and doing the velocity only on the first part.
Unfortunately, the same issue happened on the 10x - 1x fade (or whatever you would call that).
I did notice that I could pull the end of the clip to the left and it would snap at the notch.
But, when I slide it, the velocity envelope fade gets cut off (like it's still all the way over at the right, where there's no clip).

I've been watching YouTube tutorials and reading articles, but it just isn't clicking.
Somebody, please explain how I should accomplish the task that I'm working on.
JJ


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Graham Bernard
Re: Velocity Envelope Workflow
on Sep 12, 2017 at 7:03:58 am

Yeah, it does take time to get a grip on this.

1] For the present just ignore the Looping Notches.

2] Place your First Marker where you want a change and Name it - CRASH or whatever, it's your reference.

3] Where the VeloEnvel and Marker intersect Add Point.

4] If you wish/want to sustain the NEW velocity change its value to HOLD and apply the velocity you want: 200%, 400% or anything.

5] Go to your next point of reference, HITCHHIKER, or whatever . . . add MARKER and name it Hitchhiker. and repeat 3] and 4] above.

6] Now observe where your Notches are they getting ever closer to your changes? If so you are starting to run out of Video, and so be aware!

The HOLD is not just for STOP it is to also sustain a velocity. TIP: set your PREVIEW PLAYBACK to someting less than 1, I've used 0.25 on those faster sections. This assist me in getting a finer understanding of what te video looks like at a 1/4 speed WITHOUT screwing with the Velocity Envelope.

Does this help?

Here's one I just did:


* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Joshua Jackson
Re: Velocity Envelope Workflow
on Sep 16, 2017 at 2:23:25 pm

Ok...
I've been working with it, on another video, and I think I'm starting to understand.
The big thing is I'm having to work front-to-back.
I think my problem was that I was trying to start at key points and work around them.
If you just start, at the beginning, and adjust keyframes, as necessary, it seems to make more sense.
Of course, I haven't made it to the end.
I'm not sure what will happen, when I slide the end into place.
Hehehe...
JJ


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Joshua Jackson
Re: Velocity Envelope Workflow
on Sep 16, 2017 at 5:41:50 pm

Sliding the end into place worked as expected.
It didn't mess with the envelope or keyframes.
JJ


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Graham Bernard
Re: Velocity Envelope Workflow
on Sep 20, 2017 at 4:25:54 am


[Joshua Jackson] "Sliding the end into place worked as expected.
It didn't mess with the envelope or keyframes.
JJ"
Excellent!

* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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