IAMVideoCompression::put_PFramesPerKeyFrame 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
The put_PFramesPerKeyFrame method sets the rate of predicted (P) frames per key frame.
Syntax
HRESULT put_PFramesPerKeyFrame(
[in] long PFramesPerKeyFrame
);
Parameters
[in] PFramesPerKeyFrame
Specifies the number of P frames per key frame. If the value is negative, the filter will use the default rate.
Return value
Returns an HRESULT value.
Remarks
To determine if the filter supports this method, call the IAMVideoCompression::GetInfo method and check for the CompressionCaps_CanBFrame flag in the pCapabilities parameter. The GetInfo method also returns the default P-frame rate.
Requirements
| Requirement | Value |
|---|---|
| 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) |
| Library | Strmiids.lib |