Filter signalstats
  Generate statistics from video analysis.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
signalstats AVOptions:
  stat              <flags>      ..FV..... set statistics filters (default 0)
     tout                         ..FV..... analyze pixels for temporal outliers
     vrep                         ..FV..... analyze video lines for vertical line repetition
     brng                         ..FV..... analyze for pixels outside of broadcast range
  out               <int>        ..FV..... set video filter (from -1 to 2) (default -1)
     tout            0            ..FV..... highlight pixels that depict temporal outliers
     vrep            1            ..FV..... highlight video lines that depict vertical line repetition
     brng            2            ..FV..... highlight pixels that are outside of broadcast range
  c                 <color>      ..FV..... set highlight color (default "yellow")
  color             <color>      ..FV..... set highlight color (default "yellow")


