Vtc.Timecode.with_seconds-exclamation-mark

You're seeing just the function with_seconds-exclamation-mark, go back to Vtc.Timecode module for more information.
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with_seconds!(seconds, rate, opts \\ [])

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Specs

with_seconds!(
  Vtc.Source.Seconds.t(),
  Vtc.Framerate.t(),
  opts :: [{:round, maybe_round()}]
) :: t()

As with_seconds/3, but raises on error.