26 – Blender Video Editing (Keyframes can be easy /A Versatile fade in…)


Hello Youtube. Mikeycal here and this is video
number 26 in my series in Utilizing Blender as a video editor. Now, in the previous video,
I introduced you to meta strips. But today I want to talk about key frames again. Now,
I talked about key frames for the first time in video 18. So, you can go over there and
watch that video if you want a more comprehensive explanation of how keyframes work. But, I
think the problem with that video was that it made us look at so many different windows,
like the graph editor and the dope sheet, that it might have made some people think
that dealing with key frames was actually just to complicated for them. Today, I want
to show you that you don’t have to use the graph editor. You don’t have to use the dope
sheet, in order to actually insert key frames and erase keyframes. It’s really easy to use
key frames on your strips. So, what better way to demonstrate that than to show you guys
how to do a fade in from black using keyframes. Instead of doing it the way that I taught
you in a previous video, which showed you how to do it using a “gamma cross” effect.
So, let me show you how you do a gamma cross fade in first, and show you why it’s not really
the best way to do it. So, let’s go down to our add menu, go to effect strip. And we are
going to lay down a color strip. Now, the way that you do a gamma cross fade in is,
we right click on our color strip, we hold our shift button down, to group select, and
we right click on our footage that we want to fade into. We go to the add menu, effect
strip, and we do a gamma cross. Now, you can see it actually generated this gamma cross
layer, right here. What I want to do now is show you guys a feature that I only discovered,
probably in the last 5 or so months – and I use it all the time. And that is, this little
feature down here in the frame menu. It’s called Set Preview Range. And, this allows
us to repeat play a small segment of our video and it doesn’t change the Render Frame Range.
It just allows us to, kind of, cache the footage and watch it over and over again. To see the
changes that require a caching of video, in order to see it. So, in this case, we’re going
to hit the “P” button. And draw a square over the area that we want to render over and over
again. And hit the play button It’s goin g to play this over and over again. And you
can see it’s doing the fade in, as we would think it should. OK, so, what’s the problem
with doing a fade in using the Gamma Cross? Well the Problem is that it links the color
strip and the footage together. So we can’t put anything in between them. And, this is
a problem if you have transparent images that you want to cover parts of your footage. That
you want to be seen beneath the fade. But above the footage. Or sometimes, you’ll have
titles, and when you’re fading in, you want to be able to see the titles over the footage
while you fade in. I’m going to show you a Green Arrow, over here that has a transparent
background. I’m going to try to put this arrow underneath this gamma crossed fade in and
show you how it ignores this. So let’s take these two strips, I’m going to move them up.
And I’m going to grab this and I’m going to move it to the first frame. And we’re going
to play this over and over again. By doing the preview range it’s going to always recache
– so we’re going to see… As you can see, it’s not showing the arrow at all… It’s
because it completely ignores it when you do a gamma cross. It only looks at the color
strip and the footage and it crosses between those… Ignores everything in between. So
that’s not going to work for us if we need to have transparent PNG’s above our footage
and below a fade in. So, let me move the arrow out of the way again. And we’re going to delete
the Gamma strip and the color strip. And we’re going to do it now using keyframes instead
of using the gamma cross – the fade in that is… So let’s put this on frame 1, and go
to add effect strip. And we’re going to add a color strip again. And now, just make sure
that your color strip is selected by right clicking on it. And make sure that you are
on Frame 1. Go over to the Opacity setting, it’s set to 1 which means Full visibility.
And we’re going to insert a keyframe into it by holding the cursor over the property
and hitting “i”. You notice that it turned Yellow, that’s blenders way of saying:a keyframe
has been inserted into this property. So, Now, All I need to do is hold my cursor over
the VSE. Push the “Page UP” button and that jumps us to each segment break – or whatever.
And now, all I have to do is set this Opacity to 0 and hit “i”. And we now have a transition
that we can actually see. So let’s actually watch this over and over again. Give it a
second to cash. So there we go… So now you can see, there’s a fade in but this time it’s
using keyframes on the opacity instead of actually linking the color strip to the footage.
And the advantage of this is that I can now grab this color strip- that has the keyframes-
in the opacity, I can pull it up. I can grab this transparent PNG. I can put it right underneath.
And you can see, I’m going to play it back, you can already see it. So, look the Let’s
hit the refresh sequencer button. Whenever you get these little glitches, by the way,
how it like, jumping, that means that you need to hit the refresh sequencer button.
And force it to recache everything again. So it’s going to play through a couple times.
And you can see that it’s doing the fade in, and it’s also honoring the fact that there
is a image strip below the color strip that has transparent background. So there you go.
That is an easy way to create a fade in that allows you to have transparent PNGs under
it. It’s also better because, all of the keyframes are linked to this one strip, so no matter
where I put it… I’m going to hit my “P” button again and we’re going to draw this
section to watch this over. And I’m going to hit refresh sequencer and place the green
line inside of there, hit play. And you are going to see that it does the fade in from
a different location. It’s not locked to one position in my project. So, now the question
you might have is… Well I created keyframes. How do I get rid of them? Well, you can simply
get rid of keyframes by right clicking on the strip that has keyframes inserted into
them. And you can see the green here that means that it has keyframes in it. RIght Click
on this property and there is an option that says “Clear Keyframes”. Once I do that, it
deletes all the keyframes for that strip and it just becomes a regular color strip again.
So you can start all over again. You can Page up and page down buttons, uh, to set this
keyframe here, page up… set this to zero. And now we have a working fade again – that’s
mobile. So it’s way better, in my personal opinion, to use a fade with keyframes rather
than a gamma cross. I will see you guys in the next video.

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