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MFPKEY_RAVG Property

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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.

Applies To

This read/write property is available on the encoder of the following codecs:

Requirements

Client: Requires Windows Vista or Windows XP.

Header: Include wmcodecdsp.h.

See Also