IDvdControl::BackwardScan method (strmif.h)
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
Syntax
HRESULT BackwardScan(
[in] double dwSpeed
);
Parameters
[in] dwSpeed
Value that specifies how quickly DirectShow will search through the media file. This value is a multiplier, where 1.0 is the authored speed, so a value of 2.5 will search backward at two and one-half times the authored speed, while a value of 0.5 will search backward at half the authored speed. The actual speed of playback depends on the capabilities of the video decoder, and might differ from the specified rate.
Return value
Returns an HRESULT value.
Remarks
This method returns an error unless the domain is DVD_DOMAIN_VideoManagerMenu, DVD_DOMAIN_VideoTitleSetMenu, or DVD_DOMAIN_Title. For more information, see DVD_DOMAIN.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |