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AVEncMPVGOPSize property

Specifies the maximum number of pictures from one group-of-pictures (GOP) header to the next GOP header.

This property is read/write.

Data type

UINT32 (VT_UI4)

Property GUID

CODECAPI_AVEncMPVGOPSize

Property value

Encoders can implement this property as an enumerated set or as a linear range.

Remarks

Set this property before starting a recording.

Applies to Windows 8: The encoded GOP size shall be smaller than or equal to the specified number through this property, in order to keep the same B frame pattern set by CODECAPI_AVEncMPVDefaultBPictureCount throughout the GOP or due to scene change. For example, when the number of B frames in a GOP is specified to be 2, and GOP size is 11, then encoder shall produce GOP size of 10 frames or less. When scene change happens in the middle of a GOP, encoder might also insert key frame and produce smaller GOP.

GOP size 0 is encoder dependent and encoders can choose different GOP sizes based on their implementation/quality/performance. Encoders should honor the GOP size and truncate B frames in this case.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps | Windows Store apps]

Minimum supported server

Windows 2000 Server [desktop apps | Windows Store apps]

Header

Codecapi.h

See also

Codec API Properties
ICodecAPI Interface

 

 

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