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MFPKEY_BDELTAQP Property

Specifies the delta increase between the picture quantizer of the anchor frame and the picture quantizer of the B-frame.

Constant for IPropertyBag

g_wszWMVCBDeltaQP

Data Type

VT_I4

Default Value

0

Remarks

Picture quantizer (QP) is a measurement of how compressed a frame is. Higher values represent higher compression ratios. The QP can be set in half-point increments. A B-frame is typically compressed at a QP the same as or 0.5 higher than the anchor frame's QP. By specifying a B-frame QP delta higher than 0, it is possible to compress B-frames at an even higher compression ratio.

The B-frame delta QP can be set only in whole-point increments. This property must be set to an integer value from 0 to 31. The recommended value is 1.

Requirements

Minimum supported client

Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Wmcodecdsp.h

See also

Media Foundation Properties

 

 

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