Use media-video/rav1e for AVIF encoding

Packages describing “rav1e” as local USE flag

Package “rav1e” Flag Description
media-libs/libheif Use media-video/rav1e for AVIF encoding
media-video/ffmpeg Enables AV1 encoding support via media-video/rav1e.
media-libs/libavif Enable support for the rav1e codec encoding

All packages providing a “rav1e” USE flag (3)