IltmmConvert::EstimateOutputSize

#include "ltmm.h"

C Syntax	HRESULT IltmmConvert_EstimateOutputSize(pConvert, Duration, pSize)
C++ Syntax	HRESULT EstimateOutputSize(Duration, pSize)

Retrieves the estimated conversion output size, in bytes, for the specified duration.

Parameter	Description
pConvert	Pointer to an IltmmConvert interface.
Duration	Value the represents the duration in seconds for which to retrieve the estimated output size. Pass the value –1 to estimate the conversion output size for the whole file duration.
pSize	Pointer to a variable to be updated with the estimated output size for the duration.

Returns

S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

The estimated output size is calculated using the following equation:

Size = (Bitrate * Duration) / 8.

The returned size depends on the state of the convert object.

If the object is in the running state, the returned size is related to the actual number of bytes that have been written.

While if the object is not running, the returned size is a theoretical value dependent on the conversion settings and the chosen encoding settings.

Required DLLs and Libraries

LTMM

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Functions:	IltmmConvert::EstimateOutputBitRate
Topics:	Multimedia Function Group