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1-pass VBR, 2-pass CBR and 2-pass VBR Compression with Real Media, QuickTime and Windows Media

When it comes to real-time streaming videos and using Windows Media, Real Video or QuickTime there are differences between 1-pass VBR compression, 2-pass CBR compression and 2-pass VBR compression within each architecture. CBR stands for Constant Bit Rate and VBR stands for Variable Bit Rate.

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If your're looking to do real-time streaming using Windows Media you should select 2-pass CBR. In Real Media choose 2-pass VBR for real-time streams and for QuickTime choose 1-pass VBR. Even though each of these methods of compression generally has a specific meaning, there is no uniform agreement on how each method should operate within each proprietary streaming architecture. Content encoded with each of these compression methods listed (1-pass VBR for QuickTime, 2-pass CBR for Windows Media and 2-pass VBR for Real Media) can go on a streaming server as longer as you are using for example 2-pass VBR for Real Media content. Don't try encoding with 2-pass VBR using QuickTime for real-time streaming because your videos won't stream properly. 2-pass VBR encoding for QuickTime would only be good for downloadable streaming videos.

The fact that each proprietary format has different ways that it utilzes 1-pass VBR, 2-pass CBR and 2-pass VBR is a downfall because it makes it confusing for those encoding content. It would be nice if the organizations which created each format made the compression methods consistent across each format.

Learn more about compression methods such as 1-pass VBR, 2-pass CBR and 2-pass VBR in our upcoming Video Streaming and Compression class.

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Scrubbing Audio and Audio Previews in Adobe After Fx was the previous entry in this blog.

Creating Your Personal Workspace in After Fx 6.5 is the next entry in this blog.

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