IQualProp interface (amvideo.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
The IQualProp interface provides methods for retrieving performance information from video renderers. The values returned through the interface are reset each time the filter is stopped. The Video Renderer filter and the Full Screen Renderer filter expose this interface.
Applications can use this interface to retrieve video performance information.
Inheritance
The IQualProp interface inherits from the IUnknown interface. IQualProp also has these types of members:
Methods
The IQualProp interface has these methods.
| IQualProp::get_AvgFrameRate The get_AvgFrameRate method retrieves the actual average frame rate since streaming started. |
| IQualProp::get_AvgSyncOffset The get_AvgSyncOffset method retrieves the average time difference between when the video frames should have been displayed and when they actually were. |
| IQualProp::get_DevSyncOffset The get_DevSyncOffset method retrieves the average time difference between when the video frames should have been displayed and when they actually were. |
| IQualProp::get_FramesDrawn The get_FramesDrawn method retrieves the number of frames actually drawn since streaming started. |
| IQualProp::get_FramesDroppedInRenderer The get_FramesDroppedInRenderer method retrieves the number of frames dropped by the renderer. |
| IQualProp::get_Jitter The get_Jitter method gets the jitter (variation in time) between successive frames delivered to the video renderer. |
Requirements
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | amvideo.h (include Dshow.h) |