iMovie for macOS has ben updated, adding support for importing video in the HEVC (High Efficiency Video Coding) format made possible by macOS High Sierra.
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It also improves compatibility when sharing to YouTube. iMovie 10.1.7 is available at the Mac App Store.
Support for the industry-standard HEVC (H.265) enables video streaming and playback of 4K video files up to 40% smaller than with the current H.264 standar. With HEVC, Apple is enabling high-quality video streaming on networks where only HD streaming was previously possible, while hardware acceleration on the new iMac and MacBook Pro deliver fast and power-efficient HEVC encoding and editing.