split.sh

#!/bin/bash
# taken from http://d.hatena.ne.jp/libkazz/20100108/1263024229
title="05.レクチャー後編, 中埜博 笹川万国"
input=/Users/shintaro/Desktop/alexander/nakano-3.mp4
output=/Users/shintaro/Desktop/alexander/$title
offset=0 #頭だし秒数
last=1904 #動画最後の秒数
overlap=2

term=600 # 10分
cmd=/opt/local/bin/ffmpeg
opt="-sameq -f mp4"
seq=1
cursor=`expr $offset + 1`
while [ $cursor -lt $last ]; do
    echo "---$seq---"
    $cmd -i "$input" -ss $cursor -t $term $opt "$output-$(printf %02d $seq).mp4"
    seq=`printf %02d $(expr $seq + 1)`
    if [ $seq = "01" ];then
      ss_sec=$term
    else
      ss_sec=`expr $term - $overlap`
    fi
    cursor=`expr $cursor + $ss_sec`
done