Editing Variable bitrate (section)

===Multi-pass encoding and single-pass encoding===
VBR is created using so-called ''single-pass encoding'' or ''multi-pass encoding''. Single-pass encoding analyzes and encodes the data "on the fly" and it is also used in constant bitrate encoding. Single-pass encoding is used when the encoding speed is most important — e.g. for real-time encoding. Single-pass VBR encoding is usually controlled by the ''fixed quality'' setting or by the ''bitrate range'' (minimum and maximum allowed bitrate) or by the ''average bitrate'' setting. Multi-pass encoding is used when the encoding quality is most important. Multi-pass encoding cannot be used in real-time encoding, live broadcast or live [[Streaming media|streaming]]. Multi-pass encoding takes much longer than single-pass encoding, because every pass means one pass through the input data (usually through the whole input file).  Multi-pass encoding is used only for VBR encoding, because CBR encoding doesn't offer any flexibility to change the bitrate.  The most common multi-pass encoding is two-pass encoding. In the first pass of two-pass encoding, the input data is being analyzed and the result is stored in a log file. In the second pass, the collected data from the first pass is used to achieve the best encoding quality. In a video encoding, two-pass encoding is usually controlled by the average bitrate setting or by the bitrate range setting (minimal and maximal allowed bitrate) or by the target video file size setting.<ref>*{{Citation |title=Glossary |url=http://www.afterdawn.com/glossary/terms/multipass.cfm |contribution=Multi-pass encoding |publisher=AfterDawn |access-date=2009-09-30 |archive-date=2009-09-18 |archive-url=https://web.archive.org/web/20090918085940/http://www.afterdawn.com/glossary/terms/multipass.cfm |url-status=live }}
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