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=== Variable bit rate === MPEG audio may have [[variable bit rate]] (VBR), but it is not widely supported. Layer II can use a method called bit rate switching. Each frame may be created with a different bit rate.<ref name="mpeg-audio-frame-header" /><ref>ISO MPEG Audio Subgroup, [http://mpeg.chiariglione.org/faq/mp1-aud/mp1-aud.htm#15 MPEG Audio FAQ Version 9, MPEG-1 and MPEG-2 BC], retrieved on 2009-07-11.</ref> According to ISO/IEC 11172-3:1993, Section 2.4.2.3: To provide the smallest possible delay and complexity, the (MPEG audio) decoder is not required to support a continuously variable bit rate when in layer I or II.<ref>[http://www.twolame.org/doc/vbr.html TwoLAME: MPEG Audio Layer II VBR], retrieved on 2009-07-11.</ref>
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