Filter phase
  Phase shift fields.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
phase AVOptions:
  mode              <int>        ..FV.... set phase mode (from 0 to 8) (default A)
     p                            ..FV.... progressive
     t                            ..FV.... top first
     b                            ..FV.... bottom first
     T                            ..FV.... top first analyze
     B                            ..FV.... bottom first analyze
     u                            ..FV.... analyze
     U                            ..FV.... full analyze
     a                            ..FV.... auto
     A                            ..FV.... auto analyze

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

