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#!bash
max_duration=$((4*3600))
if [[ $# -ne 1 ]]; then
echo 1>&2 "Usage: $0 <media-file>"
exit 1
fi
input_file="$1"
base="$(echo $input_file | perl -pe 's/(.*)\.([^.]*)$/$1/')"
extension="$(echo $input_file | perl -pe 's/(.*)\.([^.]*)$/$2/')"
if [[ $extension == "m4b" ]]; then
extension=m4a
fi
ffmpeg -i "${input_file}" -c copy -f segment -segment_time $max_duration \
"${base}-%03d.${extension}"
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