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
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows XP [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
| Header |
|
See also