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/^(#?([a-f\d]{3,4}|[a-f\d]{6}|[a-f\d]{8})|rgb\((0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d)\)|rgba\((0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),(0|0?\.\d|1(\.0)?)\)|hsl\((0|360|35\d|3[0-4]\d|[12]\d\d|0?\d?\d),(0|100|\d{1,2})%,(0|100|\d{1,2})%\)|hsla\((0|360|35\d|3[0-4]\d|[12]\d\d|0?\d?\d),(0|100|\d{1,2})%,(0|100|\d{1,2})%,(0?\.\d|1(\.0)?)\))$/ |
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# on os x use brew to get ffmpeg with libfdk_aac | |
brew install ffmpeg --with-fdk-aac | |
# convert and use m4a as file extension | |
find . -name '*.flac' -exec sh -c 'ffmpeg -i "$1" -c:a libfdk_aac -b:a 320k "${1%.flac}.m4a"' _ {} \; |