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===Average bitrate=== The disadvantage of single pass ABR encoding (with or without Constrained Variable Bitrate) is the opposite of fixed quantizer VBR — the size of the output is known ahead of time, but the resulting quality is unknown, although still better than CBR.<ref name="hydrogen-ABR">{{Citation |title=Average Bitrate |url=http://wiki.hydrogenaud.io/index.php?title=Average_Bitrate |year=2007 |publisher=Hydrogenaudio |format=knowledgebase |access-date=2009-10-01 |archive-date=2014-07-06 |archive-url=https://web.archive.org/web/20140706173834/http://wiki.hydrogenaud.io/index.php?title=Average_Bitrate |url-status=live }}</ref> The multi-pass ABR encoding is more similar to fixed quantizer VBR, because a higher average will really increase the quality.<ref name="avidemux-h264">{{Citation |title=H.264/AVC options explained |url=http://www.avidemux.org/admWiki/index.php?title=H264#General |year=2009 |contribution=Rate Control β Encoding Mode |publisher=Avidemux |format=wiki-documentation |access-date=2009-09-30 |archive-date=2009-07-29 |archive-url=https://web.archive.org/web/20090729234601/http://www.avidemux.org/admWiki/index.php?title=H264#General |url-status=live }}</ref>
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