IltmmPlay::put_Rate

#include "ltmm.h"

C Syntax

HRESULT IltmmPlay_put_Rate(pPlay, Rate)

C++ Syntax

HRESULT put_Rate(Rate)

IltmmPlay *pPlay;

pointer to an interface

double Rate;

new playback rate

Assigns the media playback rate.

Parameter

Description

pPlay

Pointer to an IltmmPlay interface.

Rate

Playback rate. Must not be zero.

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 playback rate is expressed as a ratio of the normal speed. Thus, 1.0 is normal playback speed, 0.5 is half speed, and 2.0 are twice speed. For audio streams, changing the rate also changes the pitch.

Negative playback rates are supported only for MP4/ISO files. A negative playback rate plays the file backwards but the playback is video-only and only the key frames are displayed.

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.

Platforms

Win32, x64

See Also

Elements:

IltmmPlay::get_Rate

Topics:

Multimedia Function Group

Example

For a C example, refer to the Simple Media Player for C.

For a C++ example, refer to the Simple Media Player for C++.

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