interpolation filter in ffmpeg

[faysal.99]

hello experts,

Can anyone give me detail about the technique used in ffmpeg for interpolation/resampling. I have used ffmpeg code to resample a yuv. But i did not understand function av_build_filter.

I need theory and concept behind the technique.

thanks.

[Manao]

Here's the theory : http://idav.ucdavis.edu/~okreylos/PhDStudies/Winter2000/SamplingTheory.html