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Old 15th April 2011, 14:32   #10  |  Link
space1999
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Join Date: Mar 2011
Posts: 37
Quote:
Originally Posted by zambelli View Post
<SNIP>

AP's most important features are:
  • Interlaced encoding support (both frame and field modes)
Apologies for my ignorance, but,
what is/are the exact difference(s) between the field-based and the frame-based encodings?

EDIT:

Nevermind, I should have paid more attention to the damn documentation :–/

Quote:
FrameType

I

The buffer contains an I frame.

P

The buffer contains a P frame.

B

The buffer contains a B frame.

BI

The buffer contains a B frame. All macroblocks are encoded as intra-blocks. This is similar to an I frame, but cannot be used as a reference frame.

II

The buffer contains top field I, bottom field I.

IP

The buffer contains top field I, bottom field P.

PI

The buffer contains top field P, bottom field I.

PP

The buffer contains top field P, bottom field P.

BB

The buffer contains top field B, bottom field B.

IB

The buffer contains top field I, bottom field B.

BIB

The buffer contains top field BI, bottom field B.

BBI

The buffer contains top field B, bottom field BI.

BIBI

The buffer contains top field BI, bottom field BI.

Skipped

The buffer contains a skip frame.

Remarks

Frame types I, P, B, and BI are used for progressive and interlaced frame encoding.


The remaining frame types are used for interlaced field encoding to describe how each field is encoded. For interlaced field frame types, the field type indicator BI means that the field is type B but all macroblocks are encoded as intra-blocks.

Last edited by space1999; 16th April 2011 at 14:24.
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