IWMEncAudienceObj::put_VideoBitrate
![]() |
The put_VideoBitrate method specifies the bit rate of the video stream in the current audience.
Syntax
HRESULT put_VideoBitrate(
short iRenderSiteIndex,
long lBitrate
);
Parameters
iRenderSiteIndex
[in] short containing the audience stream index. Because an audience can only contain one stream of each type, iRenderSiteIndex must be zero.
lBitrate
[in] long that indicates the video bit rate, in bits per second (bps).
Return Values
If the method succeeds, it returns S_OK. If it fails, it supports the IErrorInfo interface and returns an HRESULT error code.
Remarks
If you are working with a profile that uses a constant bit rate (CBR) mode with the full frames (uncompressed) video codec, changing the bit rate has no effect.
Example Code
// Include libraries.
#include <windows.h>
#include <atlbase.h>
#include <comdef.h>
#include "C:\WMSDK\WMEncSDK9\include\wmencode.h"
// Declare variables.
HRESULT hr;
IWMEncoder* pEncoder;
IWMEncProfileCollection* pProColl;
IWMEncProfile* pPro;
IWMEncProfile2* pPro2;
IWMEncAudienceObj* pAudnc;
// Initialize the COM library and retrieve a pointer to an IWMEncoder interface.
hr = CoInitialize(NULL);
if ( SUCCEEDED( hr ) )
{
hr = CoCreateInstance(CLSID_WMEncoder,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWMEncoder,
(void**) &pEncoder);
}
// Retrieve a specific profile.
if ( SUCCEEDED( hr ) )
{
hr = pEncoder->get_ProfileCollection(&pProColl);
}
if ( SUCCEEDED( hr ) )
{
hr = pProColl->Item(11, &pPro);
}
if ( SUCCEEDED( hr ) )
{
hr = CoCreateInstance(CLSID_WMEncProfile2,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWMEncProfile2,
(void**) &pPro2);
}
if ( SUCCEEDED( hr ) )
{
hr = pPro2->LoadFromIWMProfile(pPro);
}
// Retrieve the first audience in the profile.
if ( SUCCEEDED( hr ) )
{
hr = pPro2->get_Audience(0, &pAudnc);
}
// Specify the video bit rate for the first stream.
long lVidBRate = 600000; // 600 Kbps.
if ( SUCCEEDED( hr ) )
{
hr = pAudnc->put_VideoBitrate(0, lVidBRate);
}
// Release pointers.
if ( pAudnc )
{
pAudnc->Release();
pAudnc = NULL;
}
if ( pPro2 )
{
pPro2->Release();
pPro2 = NULL;
}
Requirements
Header: wmencode.h
Library: wmenc.exe
See Also
.gif)