Windows apps
Collapse the table of content
Expand the table of content
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

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


Property GUID


Property value

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


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.


Minimum supported client

Windows 2000 Professional [desktop apps | UWP apps]

Minimum supported server

Windows 2000 Server [desktop apps | UWP apps]



See also

Codec API Properties
ICodecAPI Interface



© 2018 Microsoft