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If there are many effects in one location, especially multiple effects stacked within a composite, it's possible you may need to render portions of your sequence. Rendering effects simply means that you are creating, or rendering, video files of the effect's result. In this movie, we'll take a look at when and how to render effects, so that you can play back any amount of video streams. So here we are, again, with our big stacked composite, and as we saw in the previous movie, we start dropping frames downstream here.
I've also added a Timewarp effect, and I've made it go really, really fast, so it turns into a blue-dot effect. So we really do have to render two locations for this to play back in real time. Now, let's talk about when we would want to do this. If you export a sequence, the effects are automatically going to render when it creates the video file, so you don't need to render the effects when you just export a QuickTime. However, if you're going to tape, you're going to need to render your effects, because you need to play back at full quality.
So you'll need to render all blue-dot effects. I have one right here. And if I wanted to render, I'm just going to select the effect, and then come to my Render Effect button above the Timeline, and I choose which drive to send it to, and I'll click OK. This renders my motion effect, like so. So blue-dot effects always need to render when you're going back out to tape or when you just need to screen it.
Now, the other instance in which you would need to render is when your sequence is not playing back in real time. So if I play this out, let's go ahead and get some diagnosis bars down here in my time code track to see exactly what's going on. Ideally, we would be switching to full quality if we were going out to tape, but I'm just going to demo this in Draft Quality for now. So I'm going to go ahead and play this through by pressing spacebar.
So we had some feedback that our drives were being taxed right around here, and then we just started dropping frames. So from here on, we were having trouble, and we're going to need to render that in order for that to play back in real time. So one of the most common errors when people are rendering effects is they simply put an in point at the beginning of the sequence, put an out point at the end of the sequence, then come up to Clip and Render In/out. This is a terrible idea.
This wastes time and it wastes drive space. Let's talk about why. I'm going to go ahead and clear my in and out and I want to talk about Avid's top-down rendering method. When Avid renders V8, it also renders V7, V6, V5, V4, V3, V2, and V1. So when I render this effect, it's actually rendering the composite result of everything below it. Same thing for V7. When I render V7, it renders V7 and below. Same thing for 6, same thing for 5, and so on.
So if I render all of my effects in the sequence, it is extremely redundant, it's wasting space, and it's wasting your time; therefore, we're going to use the diagnosis bars in the time code track to render intelligently. To do this, I'm just going to add a video track, Ctrl+Y or Command+Y, and I'm going to come into my Effect palette, and I'm going to go to the Image category, and I'm going to apply a mask. Now, where am I going to apply this mask? The mask is just an effect that I can render so that I can render everything on V9 and below.
Therefore, I'm going to apply my mask from this point in the timeline on over. So I'm going to monitor V9. What I want to do is at this point, slightly before, I'm going to apply an edit on V9. Let me just deselect V8 through V1 by Shift+Dragging through my tracks. And I'll add an edit, and I will drag my mask effect over on this portion of V9, and this is the only effect I'm going to render.
I'm going to ignore everything else because all of the tracks on V9 and below are going to be rendered when I render this mask. So remember how many frames were dropped and then when we render this, Render Effect > Data drive. It's going to take just a little bit of time. And we'll go ahead and play through this, and let's see if we solved our problem. I'm going to go ahead and press the spacebar to play.
As you see, everything played back in real time, and we have absolutely no warning bars in our time code track, which means that there's no problem in the spring buffer, everything is filling up just fine, and Avid is playing back in real time. So I definitely encourage you to diagnose the areas in your sequence that need rendering, and if you're just editing, you of course have the Video Quality menu and the Format tab that you can change. But if you do need to render, make sure to render intelligently by diagnosing where the problem is occurring and then finding a targeted way to render that portion of the timeline.
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