MPEG frame type

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(n.) Moving Picture Expert Group frame type; one of the three basic types of frames created by an MPEG encoder. The frame types are as follows:

1. Intracoded frame (I-frame): A picture coded using only information drawn from itself. Like a key frame, an I-frame provides an access point in the data stream.

2. Bidirectionally predictive frame (B-frame): A picture coded using motion-compensated prediction from previous and future reference frames. B-frames provide an efficient means of coding but require a memory buffer for future reference frames.

3. Predictive-coded frame (P-frame): A picture coded using motion-compensated prediction from the previous reference frame.