Filter readeia608
  Read EIA-608 Closed Caption codes from input video and write them to frame metadata.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
readeia608 AVOptions:
  scan_min          <int>        ..FV.....T set from which line to scan for codes (from 0 to INT_MAX) (default 0)
  scan_max          <int>        ..FV.....T set to which line to scan for codes (from 0 to INT_MAX) (default 29)
  spw               <float>      ..FV.....T set ratio of width reserved for sync code detection (from 0.1 to 0.7) (default 0.27)
  chp               <boolean>    ..FV.....T check and apply parity bit (default false)
  lp                <boolean>    ..FV.....T lowpass line prior to processing (default true)

This filter has support for timeline through the 'enable' option.

