Equivalent to audio LFO in Resolve for video FX?

Hi folks,

In audio production great use of LFOs (low frequency oscillators) is made.

For example to take a filter and make it oscillate (between two values) at a certain frequency, according to a certain wave shape, like square, saw, pulse or random (or many more).

Is there something equivalent to this for video FX in Resolve?

Say for example i want a gamma value to move between two points and then back again at, say 0.2 hertz. Ok, i could draw it in with a spline, but if i want this to keep going for two minutes, then it gets very tedious to draw in.

LFOs are often used in audio make sounds change subtly, almost (but not quite ) imperceptibly over time, and i'm imagining such tricks might also be useful in video FX.

Any ideas or pointers to how this can be achieved would be appreciated!

And just to explain, i'm exploring Resolve for creating video art (so, not commercial video production).

I've never seen such a thing for video, and have only ever heard of it for audio during Live Reinforcement as a way to eliminate feedback. I've never heard of anyone using it for post production audio.

Your gamma example is something an OpenFX plugin could do. It could also possibly be done with a DCTL script. I’m in the process of learning OFX programming so it’s possible I could put together a plugin for this if there was enough interest.

The Fusion page might have some After Effects type expressions you could animate with.

You could try using the Perturb or Shake modifiers on the gamma.

Animate Expression to draw a sinuosidal ...

Thanks for the tips guys, will check it out!

@Gary, nice, could be interesting! .....

I guess the main difference with audio is that with video you're dealing with a certain frame rate, so in fact some LFO speeds would not be possible, although i guess your plugin could round off the number to the nearest value allowed by the frame rate. So the plugin would show your chosen LFO speed, and then (in brackets?) the actual speed it'll be rounded off to.

@Jim Simon, i think you're getting confused with something else, LFO modulation doesn't really have any application for that, you'd be more likely to reach for a notch filter with some kind of dynamic element built in.

A college uses a device that sweeps the entire frequency range so that any feedback frequencies are constantly changing and never get a chance to "build up". That's the only time I've ever heard of such a technique for audio. I've never hear of anyone doing anything like that in post production.

Of course, the technique is best used for speech. It does tend to mess with music.

SIN

A college uses a device that sweeps the entire frequency range so that any feedback frequencies are constantly changing and never get a chance to "build up". That's the only time I've ever heard of such a technique for audio. I've never hear of anyone doing anything like that in post production.
Of course, the technique is best used for speech. It does tend to mess with music.

This is probably not the place to go into this, but......... maybe LFOs have some application in sound reinforement or audio restoration, i'm not an expert in that. But it's not what most people first think of when discussing LFOs.
If you're saying that LFOs are not used in audio post production, then i'd take issue with that. What is audio "post production"? Mastering? Sure, LFOs are not used much if at all in mastering. But if you would also call mixing "post production", then of course they're used all the time, for example in a chorus or flanger effect for example. Same goes for creating sound effects. Or for (as i explained in my earlier post) to subtly vary a sound over time to trick the ear into constantly find it interesting.

If you're saying that LFOs are not used in audio post production

Sorry, no. Just that you're the first I've ever heard mention it.