IAMDroppedFrames interface (strmif.h)

The IAMDroppedFrames interface retrieves performance information from a video capture filter, including how many frames were dropped and how many were delivered. Applications can use this interface to determine capture performance at run-time.


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


The IAMDroppedFrames interface has these methods.


The GetAverageFrameSize method retrieves the average size of the frames that the filter has captured.

The GetDroppedInfo method retrieves an array of frame numbers that were dropped.

The GetNumDropped method retrieves the total number of frames that the filter has dropped since it started streaming.

The GetNumNotDropped method retrieves the total number of frames that the filter has delivered since it started streaming.


Some filters that expose this interface do not implement the GetDroppedInfo or GetAverageFrameSize method.

For Windows Driver Model (WDM) devices, the WDM Video Capture Filter automatically exposes this interface if the WDM driver supports the PROPSETID_VIDCAP_DROPPEDFRAMES property set. For more information, see the Windows Driver Kit (WDK) documentation.

The number of dropped frames is reported by the capture driver. This information is not directly correlated with any particular media sample, so it is not accurate on a per-frame basis, although it should be accurate over time.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)

See also