* Rewrite the Duration field of the Segment with the newly-discovered * video duration.

* Rewrites the SeekHead element that was initially written to the stream * with the offsets of top level elements. * * Call once

* Write a Cues element to the blobStream using the global `cues` array of * CuePoints (use addCuePoint()). The seek entry for the Cues in the

* The Buffer constructor returns instances of `Uint8Array` that have their * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subc

* @param {String} string * @returns {number}