HEIF and AVIF file format decoder and encoder - ffmpegdec plugin

 libheif is an ISO/IEC 23008-12:2017 HEIF and AVIF (AV1 Image File Format) file
 format decoder and encoder. There is partial support for ISO/IEC 23008-12:2022
 (2nd Edition) capabilities.
 .
 HEIF and AVIF are new image file formats employing HEVC (H.265) or AV1 image
 coding, respectively, for the best compression ratios currently possible.
 .
 libheif supports various codecs provided by plugins for image decoding and
 encoding.
 .
 This package contains the ffmpegdec plugin that uses FFmpeg to decode HEVC
 images. It can make use of H265 hardware decoders if available in FFmpeg.
 .
 FFmpeg: https://www.ffmpeg.org/