docs: def s2tc(s,base=25):
      """Converts seconds to timecode"""
      try:
          f = int(s*base)
      except:
          return "--:--:--:--"
      hh  = int((f / base) / 3600)
      hhd = int((hh % 24))
      mm  = int(((f / base) / 60) - (hh*60))
      ss  = int((f/base) - (hh*3600) - (mm*60))
      ff  = int(f - (hh*3600*base) - (mm*60*base) - (ss*base))
      return "{:02d}:{:02d}:{:02d}:{:02d}".format(hhd, mm, ss, ff)