Video Converter: FAQ

This is the FAQ page for the Video Converter DirectShow filter.

What CPU extensions are used?

We use MMX, SSE and SSE2 extensions with auto detection of supported features.

What is precision used?

Integer base algorithm.

What is the technique implemented in each resize method?

As follows:

How to use programmatically only those resize methods that I need?

You can set them via via IVideoConverter2::SetConversionProps2().

How do I use the Video Converter to downscale HD material to SD?

For this purpose you need to specify the CONVERTER_PROPS2 structure:

CONVERTER_PROPS2 cnvProps2;
::ZeroMemory( &cnvProps2, sizeof(cnvProps2) );
cnvProps.eInterlaceIn = eVCI_Auto; // Or eVCI_Field1First, eVCI_Field2First, eVCI_Progressive for manual setting of interlace.
cnvProps.nAspectIn = 0; // For use VideoInfoHeader2 flags or e.g. MAKELPARAM( 16, 9 ) for 16:9 AR.
cnvProps.eInterlaceIn = eVCI_Auto; // Or eVCI_Field1First, eVCI_Field2First, eVCI_Progressive for manual setting of interlace.
cnvProps.szOutput.cx = 720;
cnvProps.szOutput.cy = 576;
cnvProps.nAspectOut = MAKELPARAM( 4, 3 );
cnvProps.eKeepAspect2 = eVCKA_LetterBox; // Or eVCKA_Crop for crop or eVCKA_None for not maintain AR.
cnvProps.eResize = eVCR_CubicWithMP; // See eVCResize for other interplation algorithms.
cnvProps.eFieldProcess = eVCFP_Auto; // See eVCFieldProcess for other options.
cnvProps.optimization = eThreadPerProc; // Or eOneThread - for work in 'sync' mode.
cnvProps.dwUseCPUMask = -1; // Use all available cores/CPUs.
 
int nMask = VC_ALL_MASK;
cpVideConverter->SetConversionProps2( &cnvProps, &nMask );