FFmpex.execute

You're seeing just the function execute, go back to FFmpex module for more information.

execute(command)

execute(command :: FFmpex.Command.t()) ::
  {:ok, binary() | nil}
  | {:error, {Collectable.t(), exit_status :: non_neg_integer()}}

Execute the command using ffmpeg CLI.

Returns {:ok, output} on success, or {:error, {cmd_output, exit_status}} on error.