LEADTOOLS Multimedia Features > Multimedia Function References > IltmmPlay Interface > IltmmPlay::put_Rate

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.

Elements:	IltmmPlay::get_Rate
Topics:	Multimedia Function Group

IltmmPlay::put_Rate

Returns

Comments

Example