MFPKEY_RAVG Property
Specifies the average bit rate, in bits per second, used for 2-pass, variable-bit-rate (VBR) encoding.
Constant for IPropertyBag
g_wszWMVCAvgBitrate
Data Type
VT_I4
Remarks
In both constrained and unconstrained VBR, this value is the average bit rate across the duration of the content.
You must set this value for both modes of two-pass VBR encoding. After you begin processing samples, you must not query for this value until you are finished encoding the stream. The encoder interprets a request for this value as a signal that the encoding session is over; the next sample that you process is treated as the beginning of a new session.
This property can also be read at the end of a 1-pass VBR encoding session.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows XP [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
| Header |
|
See also