#include "ltmf.h"

C Syntax

HRESULT IltmfConvert_EstimateOutputSize(pConvert, Duration, pVal)

C++ Syntax

HRESULT EstimateOutputSize(Duration, pVal)

IltmfConvert *pConvert;

pointer to an interface

double Duration;

duration in seconds

double *pVal;

pointer to a variable

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




Pointer to an IltmfConvert interface.


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.


Pointer to a variable to be updated with the estimated output size for the duration.



The function was successful.

<> S_OK

An error occurred. Refer to the Error Codes or the HRESULT error codes in the MediaFoundation documentation.


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


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


Win32, x64

Help Version 19.0.2017.10.27
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