Filter fieldmatch
  Field matching for inverse telecine.
    Inputs:
        dynamic (depending on the options)
    Outputs:
       #0: default (video)
fieldmatch AVOptions:
  order             <int>        ..FV..... specify the assumed field order (from -1 to 1) (default auto)
     auto            -1           ..FV..... auto detect parity
     bff             0            ..FV..... assume bottom field first
     tff             1            ..FV..... assume top field first
  mode              <int>        ..FV..... set the matching mode or strategy to use (from 0 to 5) (default pc_n)
     pc              0            ..FV..... 2-way match (p/c)
     pc_n            1            ..FV..... 2-way match + 3rd match on combed (p/c + u)
     pc_u            2            ..FV..... 2-way match + 3rd match (same order) on combed (p/c + u)
     pc_n_ub         3            ..FV..... 2-way match + 3rd match on combed + 4th/5th matches if still combed (p/c + u + u/b)
     pcn             4            ..FV..... 3-way match (p/c/n)
     pcn_ub          5            ..FV..... 3-way match + 4th/5th matches on combed (p/c/n + u/b)
  ppsrc             <boolean>    ..FV..... mark main input as a pre-processed input and activate clean source input stream (default false)
  field             <int>        ..FV..... set the field to match from (from -1 to 1) (default auto)
     auto            -1           ..FV..... automatic (same value as 'order')
     bottom          0            ..FV..... bottom field
     top             1            ..FV..... top field
  mchroma           <boolean>    ..FV..... set whether or not chroma is included during the match comparisons (default true)
  y0                <int>        ..FV..... define an exclusion band which excludes the lines between y0 and y1 from the field matching decision (from 0 to INT_MAX) (default 0)
  y1                <int>        ..FV..... define an exclusion band which excludes the lines between y0 and y1 from the field matching decision (from 0 to INT_MAX) (default 0)
  scthresh          <double>     ..FV..... set scene change detection threshold (from 0 to 100) (default 12)
  combmatch         <int>        ..FV..... set combmatching mode (from 0 to 2) (default sc)
     none            0            ..FV..... disable combmatching
     sc              1            ..FV..... enable combmatching only on scene change
     full            2            ..FV..... enable combmatching all the time
  combdbg           <int>        ..FV..... enable comb debug (from 0 to 2) (default none)
     none            0            ..FV..... no forced calculation
     pcn             1            ..FV..... calculate p/c/n
     pcnub           2            ..FV..... calculate p/c/n/u/b
  cthresh           <int>        ..FV..... set the area combing threshold used for combed frame detection (from -1 to 255) (default 9)
  chroma            <boolean>    ..FV..... set whether or not chroma is considered in the combed frame decision (default false)
  blockx            <int>        ..FV..... set the x-axis size of the window used during combed frame detection (from 4 to 512) (default 16)
  blocky            <int>        ..FV..... set the y-axis size of the window used during combed frame detection (from 4 to 512) (default 16)
  combpel           <int>        ..FV..... set the number of combed pixels inside any of the blocky by blockx size blocks on the frame for the frame to be detected as combed (from 0 to INT_MAX) (default 80)


