MF_VIDEO_MAX_MB_PER_SEC attribute

Specifies, on IMFTransform, the maximum macroblock processing rate, in macroblocks per second, that is supported by the hardware encoder.

Data type

UINT32

Remarks

This is a read-only attribute.

H.264/AVC encoders:

This attribute is affected by the following properties:

• MF_MT_VIDEO_LEVEL (which is an alias of MF_MT_MPEG2_LEVEL)
• CODECAPI_AVEncCommonQualityVsSpeed
• CODECAPI_AVEncMPVDefaultBPictureCount

If the MF_MT_VIDEO_LEVEL attribute is present, the encoder should return the processing rate for the highest bitrate and resolution supported at the specified level. If the MF_MT_VIDEO_LEVEL attribute is not present then it should use a default level of 4.

If the CODECAPI_AVEncCommonQualityVsSpeed ICodecAPI property has been set, the encoder should return the processing rate corresponding to the value set for this property. If the CODECAPI_AVEncCommonQualityVsSpeed attribute is not present, then it should use a default value of 0 which should be the fastest processing mode.

If the CODECAPI_AVEncMPVDefaultBPictureCount ICodecAPI property has been set to a valid and supported value, the encoder should return the processing rate corresponding the value set for this property. If the CODECAPI_AVEncMPVDefaultBPictureCount attribute is not present, then it should use a default value of 0 B frames.

Only the lower 28 bits should be used by an application. The upper 4bits are reserved for future use. Applications should ignore the upper 4 bits and MFTs should set the upper 4 bits to 0.

Requirements

Requirement	Value
Minimum supported client	Windows 8.1 [desktop apps | UWP apps]
Minimum supported server	Windows Server 2012 R2 [desktop apps | UWP apps]
Header	Mfapi.h

See also

Alphabetical List of Media Foundation Attributes