def get_timecodes(at, drift_behind, drift_ahead)
      now = timeint(at)
      timecode_start = timecode(now - drift_behind)
      timecode_end = timecode(now + drift_ahead)
      (timecode_start..timecode_end).step(1).to_a
    end
def get_timecodes(at, drift_behind, drift_ahead)
      now = timeint(at)
      timecode_start = timecode(now - drift_behind)
      timecode_end = timecode(now + drift_ahead)
      (timecode_start..timecode_end).step(1).to_a
    end
Get back an array of timecodes for a period