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ILMScrCapEncoder

This is the interface for the LEAD Screen Capture Encoder.

Interface Properties:

Type	Name	Description
long	KeyFrameSpace	Gets or sets the number of frames between key frames (key frame spacing). For example, if the rate is 5, then a key frame is taken every 5 frames. If the value is 0, then the first frame is the only key frame in the video.
BYTE	QFactor	Gets or sets the quality factor for compression. The value range is between 1 and 9. Use 1 for fast compression and 9 for high compression.
VARIANT_BOOL	IsLEADInputPinConnected	Read only; returns TRUE if the filters input pin is connected.
VARIANT_BOOL	IsLEADOutputPinConnected	Read only; returns TRUE if the filters output pin is connected.
long	InWidth	Read only; the input stream width.
long	InHeight	Read only; the input stream height.
long	OutWidth	Read only; the output stream width.
long	OutHeight	Read only; the output stream height.
long	InBits	Read only; the input stream bits per pixel.
long	OutBits	Read only; the output stream bits per pixel.

Interface Methods:

HRESULT ResetToDefaults();

Description

Resets the filter properties to their default values. Calling this method can cause the filter to reconnect its output pin.

Returns

S_OK if successful, < 0 if an error occurred.

Common error codes:

VFW_E_WRONG_STATE

The filter is in the wrong state.

HRESULT ForceKeyFrame(long FrameNumber)

Parameters

FrameNumber

The zero based number (position) of the frame to compress as a key frame. Use -1 to make the next passing frame a key frame. Valid values range between -1 and the total number of frames in the stream less one. Note that the filter do not know the total number of frames in the stream; so a number greater than the total number of frames in the stream will be accepted but will have no effect since it will not be reached.

Description

Forces the frame at the specified position to be a key frame. The method will return S_FALSE if the frame at the specified position has already been compressed.

Returns

S_OK if succeeded, Error code otherwise.

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