EditReady 2.1 adds support for the H.265 HEVC codec in QuickTime (.mov) output formats. HEVC is a state-of-the-art delivery codec, offering improved quality at lower data rates than H.264.
This functionality is only available on Macs running macOS 10.13 High Sierra. If you received a warning trying to output to HEVC, it is because you are running an earlier version of macOS. Users can update for free in the App Store. Please confirm your needed apps are all supported before making the transition.
HEVC is a very computationally demanding codec. The latest (2017) Macs have dedicated hardware support for HEVC. On older macs, HEVC will be much slower to encode than other formats.