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AOMedia To Release AV2 Video Codec At Year's End
(www.phoronix.com)
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I haven't seen h264 used except for bd remuxes because the blu-ray standard uses h264
Yeah h264 is the base codec (also known as AVC), x264 is the dominant encoder that encodes in that codec. So the base BDs are just plain h264, and remuxes will take that h264 and put it into an mkv container. Colloquially, people tag WEB-DL and BDs/remuxes as "h264" as they're raw/untampered-with, and anything that's been encoded by a person as "x264". Same thing for h265/HEVC and x265, and same for h266/VVC and x266.