Volume Envelope Effect

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Note

[Deprecated. This API may be removed from future releases of Windows.]

 

The Volume Envelope effect sets the volume on an audio stream.

Class ID (CLSID): {036A9790-C153-11D2-9EF7-006008039E37}

CLSID Variable Name: CLSID_AudMixer

Properties

Property	Type	Default	Description
Vol	double	1.0	Volume, as a percentage of the authored volume. You can produce audio fades by varying this property value over time.

 

Remarks

Each object in a timeline can have at most one volume envelope effect. In a composition or a group, the volume envelope is applied first, before any other audio effects, regardless of its priority. In a source or a track, the volume effect is applied according to its priority.