Microsoft DirectX 9.0


The SetPreviewMode method sets the preview mode for the group.


HRESULT SetPreviewMode(
    BOOL fPreview



Boolean value that specifies the preview mode. If TRUE, the group is in preview mode. If FALSE, the group is in authoring mode.

Return Value

Returns S_OK.


In preview mode, frames are dropped during slow effects or transitions to keep the video synchronized with the audio. The video might look choppy as a result. In authoring mode, every frame is rendered. Authoring mode is appropriate for writing files; for on-screen preview, the video might be out of sync with the audio.


Header: Include Qedit.h. This header file is not compatible with Microsoft® Direct3D® headers later than version 7.

Library: Use strmiids.lib.

See Also