Free the mouse Replay GOP
Home | Changes | Index | Search | Go
GOP stands for "Group of Pictures" or how often a keyframe is present.

More technically, there are three types of frames in an MPEG-2 video stream. I Frames (Key Frames), P Frames, and B Frames.

A standard sequence of I-B-B-P-B-B-P-B-B-P-B-B-P-B-B-I would have a Group Of Picture of 15, with 15 representing the interval at which I-Frames repeat.

In the context of the ReplayShow structure, GOP_count is the number of key frames. GOP_highest and GOP_last are referencing start of a GOP, namely the I Frame so when you resume viewing you don't get strange MPEG artefacts.

NOTE: The distance between I Frames are usually not constant in a file but usually don't exceed more than 15 or 18 frames.

-- LeeThompson - 24 Mar 2002

Your post will appear before this form in chronological order (newest at bottom)

Topic GOP . { Edit | Attach | Ref-By | Printable | Diffs | r1.3 | > | r1.2 | > | r1.1 | More }
Revision r1.3 - 01 Apr 2003 - 04:41 GMT - TWikiGuest
Parents: GuideSnapshot > ReplayShow
Copyright © 2001 by the contributing authors. All material on this collaboration tool is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback.