Join Jason Osder for an in-depth discussion in this video Higher quality encodes with variable bitrate encoding in Adobe Media Encoder, part of Premiere Pro Guru: Outputs and Media Encoder.
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We just talked about a scenario where you're in a huge hurry, and speed is more important than quality. But what about the reverse? When you want to make sure that you're getting the maximum quality for the compression you're doing. Well that's when you want to get into variable bit rate encoding. So let's see how that works. I'm here in the encoder interface. And in fact, I'm exactly where we just left off. Which was, we just finished an MEPG2 constant bit rate encode and you can see that this is grayed out.
I can't run another encode here or adjust these settings. And, the reason is, if you scroll over to the right here, that the status is done. But, in this scenario, where I want to run exactly the same source compression, but change the quality settings, the easiest way to do that is just going to be to reset the status. So, just a right click on here and Reset Status and now I'm back to where I was just before I actually ran the in code. And if we go into the detailed settings, you'll see that I've still got that constant bit rate.
There it is, CBR. So we talked a lot about the differences between CBR, VBR 1 Pass, and VBR 2 Pass, but in the scenario where you're going for quality, and we're still doing a DVD encode here but what I'm showing you is totally relevant to H.264. Also the types of files that you'll upload to YouTube or Vimeo. I do this a lot with all those types of files. Which is to move to the highest quality. Remember, fastest least quality, slowest highest quality.
So go ahead and click that. And now we’re going to have VBR 2 Pass that’s going to take a little bit of time and now you can tweak these settings. So you have the minimum, the target and the maximum, and just know that it’s going to vary between these. Now, I don’t usually tweak the settings until I see that there is actually a problem, that there is something wrong. Sometimes depending on the recommendations on something like Vimeo, I'll just bump up the top and the average. But if I run a compression and I see some bad noise or artifacting, I'll absolutely come in here on my variable bit rate and up the minimum, meaning it never drops below four.
You can also type in if you want an exact number. And then I'll move all of these up, maybe the average at six. And the top at eight. Now you have to be careful here because this does have to do with size. this is a very short video and if we were to burn it to DVD it'd be hardly use any of the space on the DVD but if your working with 90 minutes or 120 minutes you do have to be careful of size. So, here we are on our a 2 Pass and we've really tweaked this for the highest possible quality so we'll just click OK.
And we were on the last one, so I don't think I'm going to run this one. But rest assured, it would A take longer, and B probably look better. And I say probably, because when it comes down to the naked eye different people see things differently, and also, different video encodes differently. A very simple video, say me talking to camera, very still with a plain background, you might not notice the difference between variable bit rate, because there's not that much variation. Constant bit rate might be just fine.
But if you want the highest, best quality, and you don't mind waiting, go for VBR 2 Pass.
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- Understanding compression terminology
- Exporting directly from Premiere Pro
- Using the Media Encoder interface
- Outputting media for Apple and Android devices
- Adjusting settings
- Automating compression workflows