Bi-Directional Predictive Frame

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What Does Bi-Directional Predictive Frame Mean?

A bi-directional predictive frame (B-Frame) is part of an MPEG video compression standard. In this method, groups of sequential pictures are aggregated to form a group of pictures (GOP), which are displayed in sequence to provide video. A single bi-directional predictive frame relates to other frames directly preceding or following it.

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By recording just the information that differs from a preceding picture or a following picture, the data storage requirements for each individual picture become much lower than in a technique that would store each successive image completely.

A bi-directional predictive frame may also be known as a bi-directional frame.

Techopedia Explains Bi-Directional Predictive Frame

Using other factors like slices per frame, experts are able to come up with more precise compression ratios for these types of MPEG files. New techniques such as temporal trajectory filtering can also help. New MPEG standards are maintained by the Motion Picture Experts Group, a creation of the International Organization for Standardization and the International Electrotechnical Commission.

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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.