All language subtitles for 5. Edit tab - Optical Flow and Speed Warp Edit Tab Kolder Creat

Now, what can we

do if we want to slow down our clip
even more?

This clip was shot at 60 frames
per second.

So we know that the maximum
that we can slow it down to is 40%.

Well, what happens
if we want to slow it down to 10%?

So let's just see what it looks like.

So, I mean, hey, Commander.

Command shift.
Ah, let's do the same thing.

And at this point, let's slow
this section down to 10%.

So I'm going to drag these speed handles
here,

these speed points to 10%,

and I'm going to select the keyframes
here, smooth them out.

Let's play it

very choppy.

We can clearly see that it's skipping.

It's showing us frame by frame.

And it just it doesn't look good.

Like it looks very unprofessional.

No one would actually ever do that.

Now, individually,
we have this really cool section

inside of our inspector here at the bottom
re time in scaling.

Normally it's close like this.

You could just click it and open it
and it gives us some options as to how

we want this slow motion or the speed
change with individually to be processed.

So in this case,
what we're going to want to do is ask

Da Vinci to analyze
this part of the clip differently.

We want it to instead of
just slow down the clip.

So it's you know,
we can see each frame individually.

We want it to generate frames
in between these frames

to basically make it seem as though
it's smooth motion.

Right now, we're missing
frames in between these frames.

And that's why we can see that skipping.

We can see each individual frame.
It doesn't look smooth.

So the way that we can do that is change
the re time process to optical flow.

Optical flow is basically
just asking the program to create

those artificial frames
and to make the footage look smoother.

And what I found is optical flow

is not that processor intensive.

I'm able to playback the clip right away

and it doesn't require
too much power from my computer.

So let's play this back. Let's press play

so we can see
that we're experiencing a bit of lag right

now, slowing down a bit.

And that looks really good.

We can see that we no longer
have that skipping.

Da Vinci has created extra frames
to make this feel smooth.

And in this situation, it's done
an amazing job.

I'm super stoked on this end result.

Now, in some situations, optical flow
might not do the best job.

So what we're going to want to do in
some situations

is go to the second option here
motion estimation

and change that from project settings
to speed warp down here.

Now, I'm not actually going
to press speed warp right now

because it slows down my computer
significantly.

It's very processor intensive
and my fully maxed out

20 2016 inch MacBook Pro

top tier just starts to lag like crazy.

I literally can't even like open up

a new safari window
while this is happening.

Like it's just sucking all the power
out of my computer.

So here I rendered out two examples.

So the first one is just optical flow.

So we have a seal swimming over here

and it does this little jump
and I wanted to slow that down

and we can see that things kind of look

a bit off, doesn't look too great.

So I decided to use Speed Warp,

which is a setting in motion estimation.

So I changed it from project
settings to speed warp.

And if we view that,

we can see in this situation

it actually did not make things
much better.

We can see a lot of weird stuff

happening down here, down below.

Things are just looking off.

So in this situation
I would say that it didn't

necessarily
do a better job at on the top here.

It looks like
it might have done a better job.

I'm not seeing as much skipping
that movement of the rocks

feels a bit smoother,
but down below, everywhere else,

there's some weird stuff going on.

So in this situation, optical

flow might have actually been better

than applying speed warp,
but that's not always the case.

That's why it's important to experiment
with this kind of stuff.

Unfortunately, using speed warp
can sometimes take a very long time.

So what I actually do is
when I want to apply

speed warp to my clip, I'll change motion
estimation to speed warp.

And then right away,
the first thing that I'll do

is right click on the

clip and render in place.

Now, I'm not going to do that right now
because my computer's going to die.

But what that allows you to do
is it renders the clip in place.

You'll get a pop up window on DaVinci,
so I'll just do it for the clip.

Without that selected,
it gives you the option

to select
how you want this to be exported.

And when you press render,
it will render it in place.

It'll render it
to whatever folder you've selected

and it'll replace what you have here
with a rendered clip.

And when I'm changing
the motion estimation to speed warp,

I'm pretty much always going to do that
because otherwise there's no chance

that I, with my MacBook, can get DaVinci
to actually playback the clip

it needs to render it and replace it
in order for it to playback.

So this is another clip that I have here
that I wanted to show you guys,

because this is an example
of where Speed Warp actually works

really well and it shows just how powerful

this option is within Da Vinci.

So I have this clip here.

This is shot at 4K 60 on a phone

and I want to slow it down just up here.

Now, I've actually rendered out
each version of this clip,

one with optical flow, one with speed warp
and one with just the project settings

so that you guys can see the difference
between all of these.

So the first one is just project settings.

So where we're going from 100% to 10%,

there's a little little section right here

where we're at 10% and obviously
it looks very unprofessional.

You can see each individual frame.

It just doesn't look good.

Now, I tried optical flow
and let's take a look at optical flow.

We got some weird stuff happening here.

Even with optical flow,

I thought that optical flow
is going to work

well because it's a simple, simple
kind of frame, you know?

And we have a blue background.

Your subject is removed
from the background.

So this I thought,
would be a great example for optical flow.

But we can still see that
there's like a lot of blending here.

We can see at this stage
where is it right here?

Like that just does not look good.

The helmet, it's like blurry.

Things just don't look good.

Now, what I did in this situation

was I, I selected Speed warp.

So now we can watch Speed Warp.

It looks much better.

It's still not perfect,

but we're not getting that same kind
of artifacting and ghosting.

That optical flow was giving us
the tire is staying solid

throughout the entire time
and things are looking pretty good. Now.

If I wanted to make this look even better,

I would have shot at a much
higher shutter speed.

Now I shot this at double shutter.

So since since we're shooting 60 frames
per second, I was shooting

at a shutter of one over 120.

That's basically the rule
that every filmmaker follows.

But if I wanted to make this clip
feel like it was actually shot

at a very high frame rate,
I would have shot at a much higher

shutter speed
so that we're not getting any motion blur.

So optical flow and speed warp,

they're going to struggle with motion blur

because you don't have that crisp, clean
edge, you don't have all the detail.

Everything is kind of already blurry
because of the motion blur.

So if you do want to achieve
the best effect possible,

then you're going to want to shoot
on a higher shutter speed.

That speed warp
clearly did a much better job

and it's a very viable option
in this situation.

I would probably use that clip
if I needed to slow it down.

That much in an actual production,
in an actual commercial or whatever.

Speed Warp actually uses

A.I., It uses artificial intelligence
to try to figure things out.

That's why it takes much longer.

This dirt
bike clip actually took about 5 minutes.

I timed it just to analyze the clip
and apply that speed warp effect to it.

And then right away
I had to right click and render in place

just so that DaVinci wouldn't bottleneck
and I can still edit in the program.

So it's important to render in place
when you're changing the motion estimation

to speed warp.

Now there are some other options here in
real time process and motion estimation.

We have some other options here.

I've experimented with these and really

the only one that I have personally
use is speed warp.

If you are not getting the desired
effect with speed warp or

optical flow,

feel free to play around, experiment,
try different things.

But in my experience, both optical flow
and speed warp work, the best.

Now we do have this other setting frame
blend here

and nearest
and I pretty much never use those.

Let me just show you guys an example
of what frame blend it looks like.

If you go back to the steel clip,
I have this frame blend example.

And basically what frame Blend does
is it blends the

the previous frame
and the next frame together.

And in this case
it might not look so terrible.

But when we compare this image

to just optical flow,

optical flow

looks way, way better in my opinion.

So frame blend is there.

It will blend

the previous frame in the next frame
to try to kind of generate a metal frame.

In my opinion, I haven't ever used it.

I don't think I'm ever going to use it,
but it's there.

So that is my exact process.

On how I read Time and Speed ramp my clips
with in Da Vinci, as well as how I use

optical flow and speed Warp
to slow things down even more.

I highly recommend that you go ahead.

Open Da Vinci
if it's not already open and experiment

with all of these different features
just so that you can get

a firsthand experience
on how all of this works.

The more you play around and experiment
with these features, the more experienced

you'll be as an editor,
and you'll have a better idea

as to what options work
best in certain situations in the future.

So that's it for this video.
I hope you guys enjoyed.

I hope you learn something new
and I'll catch you in the next one.