IDVSplitter interface (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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

Downgrades the frame rate on a digital video (DV) stream. The DV Splitter filter exposes this interface.

Applications can use this interface to reduce the frame rate on a DV stream, before the stream reaches the DV Video Decoder filter. This can be helpful for processor-intensive tasks, such as real-time transcoding.


The IDVSplitter interface inherits from the IUnknown interface. IDVSplitter also has these types of members:


The IDVSplitter interface has these methods.


The DiscardAlternateVideoFrames method discards half of the frames in the video stream. For NTSC, the frame rate is reduced from 30 frames per second (fps) to 15 fps. For PAL, the frame rate is reduced from 25 fps to 12.5 fps.


Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)