VP 22: Keep Keyframe Automation Proportional on Time-Stretch

Soniclight-2.0 wrote on 9/9/2025, 4:32 PM

Let's take something simple - basic Vegas video intro title:

When I reduce or stretch out the Generated Media event, the keyframes for whatever FX I have automated for it such as Glint or Color Correction do not follow proportionally and seem to vanish or sit at the original length keyframes location in the combined keyframes automation timeline, so I have to re-do them.

(Maybe the use of "automation" isn't quite Vegas-speak, I'm basically just translating what I do with track automation lanes in Steinberg Cubase Pro. But hopefully I'm making sense anyway.)

I must be missing something really basic here to not have this happen...
Thanks.

Comments

bvideo wrote on 9/9/2025, 8:54 PM

If you change the event length with ctrl-drag on the right edge, the keyframes change proportionately.

Soniclight-2.0 wrote on 9/9/2025, 9:51 PM

@bvideo - I've tried that, both with regular select + Ctrl drag, and selecting the Time Stretch version of select. Maybe I have some Vegas preference set that is preventing this?

Here are the results of some temporary applications of this boo-boo.
The keyframes just don't want to behave...

The first here is the original length:

Second is stretched out longer:

Third, made shorter:

Soniclight-2.0 wrote on 9/15/2025, 4:38 AM

It's been a few days, no follow up. And still not solved.
So gotta bump... 😎

Jack S wrote on 9/15/2025, 10:59 AM

@Soniclight-2.0 I don't know whether this will solve your problem. After you've extended your event, select all your key-frames, click and drag the end key-frame while holding down the Alt key. All the selected key-frames will extend proportionally. If you shorten the event resulting in the last key-frame sticking to the end, lengthen the event until the key-frame moves back into position, use the Atlt+drag method to bring them within your new event length, then expand them accordingly. Not an ideal situation, but I don't think there's an automatic way of doing it.

Soniclight-2.0 wrote on 9/15/2025, 11:37 AM

@Jack S - Thanks, as you said, not ideal, but nice to know. Seems like something that should happen automatically on + or - time stretch. Much like how frames and audio data changes in those circumstances.