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VP9, famous for being YouTube's codec of choice for many years, is a royalty free video compression format that competes with HEVC and AVC. It is slightly less efficient than HEVC in terms of visual quality, but VP9 is a computationally much simpler codec and therefore is very easy on system resources when decoding. If you're interested in VP9 encoding, please see the vpxenc or SVT-VP9 sections.