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Building an MPEG-2 for broadcast

From: Compressor 4 Essential Training

Video: Building an MPEG-2 for broadcast

While it's occurring less and less, we still get asked to deliver, on occasion, in broadcast, a large bit rate MPEG-2 file. If you get asked this, we are going to sit back, and we are going to see how we can use Compressor to solve this problem. And I just want to make a point again that you can use any starting video file you want. I am using our Mission Statement. I am going to look at a particular Apple MPEG-2 preset. So I am going to open my Apple presets, and I am going to look here at MPEG files. There are four settings. I am going to talk about MPEG-1s when we do PowerPoint a little bit later in this title.

Building an MPEG-2 for broadcast

While it's occurring less and less, we still get asked to deliver, on occasion, in broadcast, a large bit rate MPEG-2 file. If you get asked this, we are going to sit back, and we are going to see how we can use Compressor to solve this problem. And I just want to make a point again that you can use any starting video file you want. I am using our Mission Statement. I am going to look at a particular Apple MPEG-2 preset. So I am going to open my Apple presets, and I am going to look here at MPEG files. There are four settings. I am going to talk about MPEG-1s when we do PowerPoint a little bit later in this title.

I've got three MPEG-2 settings here. MPEG-2 Transport streams, they are going to be used predominantly for DVDs. We are ignoring that. You'll notice the only difference between the other two we have left is what kind of color space, and I'm not going to get into that beyond probably for broadcasters if they ask you to deliver an MPEG-2 file, this will be the one they want, a 4:2:2 color space. It just means it's got a little bit more information as far as chroma sampling goes. I have dragged this and dropped this up top. I am going to take a look at the Encoder tab, so I am going to come down here.

I am going to light up the Inspector. You will see we are building an MPEG-2, and its stream use is Generic. It's kind of important that you understand that it can be used for all sorts of stuff. And in this case, we are going to build a high-def MPEG-2 file. I am going to come here to Quality, and this is where you'll pay attention to what your broadcaster wants. In this case I am going to just use a One pass VBR. I am going to make it do a faster compression, a faster analysis step. It won't be as thorough, but the bit rate I am using, the numbers I am going to use, we probably don't need to do two passes.

I am going to take that bit rate, and I am going to take it all the way up to 30. Notice the variable-ness. The maximum bit rate is going up as well. When I get this to 30 or so-- we'll not make it exactly 30-- it's automatically gone in just the maximum. So it's going to be 30. It could peak as high as 35, and it probably be a value of about 25. That's the whole concept of that variable bit rate. One thing that makes Stream Usage different between Generic and SD DVD and Blu-ray are some of the extras that are thrown here, and you can see that very evident there, that YUV encoding like this 4:2:2 is not for DVD use.

So this is good for our broadcast delivery, based on what our broadcaster asks for, a 30-megabit stream that has some VBR to it as an MPEG-2 file. So I am going to save that. Let's put all those details in here like we've been doing so far. MPEG-2 30 megabits per second. We might even add 1-pass here. You don't have to. It's a nice bonus. And we'll do this for broadcast delivery. I am going to hit Save. And pretty much as I have been doing across the way, I am going to trash the one that I've attached here and grab the one from the Custom Setting, because it's going to buy me the ability to have it automatically append all that to the name of the video. And I will say Submit.

Go to town, and here it goes with that compression. When done, this will be a fairly high data rate for an MPEG-2 file, and what we get on the far end is this MPEG-2 that can be used for a broadcast. The cake is almost finished being baked. Java is successful. I want to go ahead here and take a look out in the Finder, and you can see that this is a fairly large file to some of the other compressions we've done. But the beauty here is this is an MPEG-2 that's really meant less for a playback on your computer--although your computer could do it--and more for a broadcaster for a play-out workstation, which is pretty much how most broadcasters handle playback.

Very few of them use videotape anymore. They play back from a digital file. And that's a great use of the MPEG-2 presets.

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Compressor 4 Essential Training

32 video lessons · 8679 viewers

Jeff I. Greenberg
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