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VTM

VTM is the original H.266 (better known as VVC) reference encoder, in competition with alternatives like VVenC. In the modern day, it joins other MPEG reference encoders such as HM & JM in their reputations for being highly niche offerings that are used rarely due to their usage complexity & speed disadvantages; however, VTM may be more useful due to the current difficulty facing VVC encoding regardless of the encoding implementation one chooses to use. x264 is more efficient than JM.