Video Converter: FAQ
From AVObjects Knowledge Base
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eVCR_Nearest, // Neighbours neirborn. | eVCR_Nearest, // Neighbours neirborn. | ||
eVCR_Linear, // Linear interpolation (bilinear). | eVCR_Linear, // Linear interpolation (bilinear). | ||
Revision as of 13:46, 9 July 2008
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:
eVCR_Nearest, // Neighbours neirborn. eVCR_Linear, // Linear interpolation (bilinear). eVCR_Cubic, // Cubic interpolation (bicubic). eVCR_Super, // Super sampling interpolation (bicubic in enlarge case). eVCR_Lanczos, // Lanczos interpolation. eVCR_CubicWithMP, // Cubic interpolation for horizontal and weight-based with gauss distribution for vertical; // useful for resize of interlaced video. eVCR_MPLinear, // Weight-based algorithm with linear distribution. eVCR_MPGauss, // Weight-based algorithm with gauss distribution. eVCR_MPBlackman, // Weight-based algorithm with blackman distribution. eVCR_MPHamming // Weight-based algorithm with hamming distribution.
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 set 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 set 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 );
