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=== Multiple references === Multiple references to motion estimation allows finding the best reference in 2 possible buffers (List 0 to past pictures, List 1 to future pictures) which contain up to 16 frames in total.<ref>{{Cite web|url=https://forum.doom9.org/showthread.php?t=129364|title = A rookie question regarding on B frame in AVC - Doom9's Forum}}</ref><ref>{{cite web|title=X264 Stats Output, the "ref B L1" part|url=http://mewiki.project357.com/wiki/X264_Stats_Output|archive-url=https://web.archive.org/web/20141122182446/http://mewiki.project357.com/wiki/X264_Stats_Output|archive-date=2014-11-22}}</ref> Block prediction is done by a weighted sum of blocks from the reference picture. It allows enhanced picture quality in scenes where there are changes of plane, zoom, or when new objects are revealed. [[File:Multiple references.jpg]]
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