VTM

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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.