H265 with ffmpeg

install-ffmpeg-with-h265.sh

# Installing ffmpeg with H265 support
brew tap varenc/ffmpeg
brew install varenc/ffmpeg/ffmpeg --with-fdk-aac --HEAD

# Installing mp4edit tool
brew install bento4

toh265.sh

#!/bin/sh

for input in "$@"
do
    file=${input%.*}
    output=$(basename -- "$file")
    ffmpeg -i "$input" -movflags use_metadata_tags -map_metadata 0:g -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a -tag:v hvc1 -c:v libx265 -c:a libfdk_aac -profile:a aac_he_v2 -x265-params crf=25 -preset ultrafast "$output-new.mp4"
    touch -r "$input" "$output-new.mp4"

    temp_file=$(mktemp)
    mp4extract moov/meta "$input" "$temp_file"
    mp4edit --insert moov:"$temp_file" "$output-new.mp4" "$output-newest.mp4" && rm "$output-new.mp4"
done

toh265mono.sh

#!/bin/sh

for input in "$@"
do
    file=${input%.*}
    output=$(basename -- "$file")
    ffmpeg -i "$input" -movflags use_metadata_tags -map_metadata 0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a -tag:v hvc1 -c:v libx265 -c:a libfdk_aac -profile:a aac_he -x265-params crf=25 -preset ultrafast "$output-new.mp4"
    touch -r "$input" "$output-new.mp4"

    temp_file=$(mktemp)
    mp4extract moov/meta "$input" "$temp_file"
    mp4edit --insert moov:"$temp_file" "$output-new.mp4" "$output-newest.mp4" && rm "$output-new.mp4"
done

Updated gist to conform new ffmpeg Homebrew formula

Useful article: https://brandur.org/fragments/ffmpeg-h265