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GOP Structure

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bruno silva
GOP Structure
on Aug 7, 2008 at 9:41:17 pm

Does anyone know the difference between these GOP structure and what they even mean? IBBP IBP IP, I came across these while using Compressor and messing with the options in the dvd settings.

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Craig Seeman
Re: GOP Structure
on Aug 7, 2008 at 10:18:22 pm

See this brief description.

GOP - Group Of Pictures.

GOP - Begins with an "I" frame, followed usually by a number of "P"
and "B" frames

- GOP's can be as small as a single I frame, or as large as
desired, but usually no more than 15 frames in length.

- the longer the GOP, the more efficient, but less rubust the

I frame - "Intra-coded" frames

P frame - P frames are predicted based on prior I or P frames

B frame - Bidirectionally predicted frames based on appearance and
positions of past and future frames

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