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Creates a memory copy of an image.
HRESULT CopyImage( IMediaSample * pMediaSample , VIDEOINFOHEADER * pVideoInfo , LONG * pBufferSize , BYTE * pVideoImage , RECT * pSourceRect );
If the pVideoImageparameter is NULL, the pBufferSizeparameter is filled in with the number of bytes the output buffer requires to store the image. If the buffer passed in is too small or the member function fails to allocate sufficient memory, the member function returns E_OUTOFMEMORY.
The member function retrieves the image from the sample and copies it into the output buffer. The section of video copied into the output buffer reflects the source rectangle that is set through the IBasicVideointerface (although it does not reflect the destination rectangle).