###tool
$ sudo port install graphicsmagick ffmpeg imagemagick
###ffmpeg
####mp4,flv,swf -> mp3
~/.zshrc
alias ffmpeg-mp3='for i in *.mp4; do ffmpeg -i $i -vn ${i%.mp4}.mp3; done'
alias ffmpeg-flv='for i in *.flv; do ffmpeg -i $i -vn ${i%.flv}.mp3; done'
alias ffmpeg-swf='for i in *.swf; do swfextract -m $i -o ${i%.swf}.mp3; done'
####mp4 -> gif
alias ffmpeg-gif='ffmpeg -i *.mp4 -r 6 %04d.png && gm convert *.png hoge.gif'
-r speed
###mogrify for Mac
####jpg -> png
alias jpg='mogrify -format png -quality 100 *.jpg'
####bmp -> png
alias bmp='mogrify -format png -quality 100 *.bmp'
###file rename
alias rename='declare -i i; i=0; for file in *; do i=`expr $i+1`; mv "$file" $i.png; done;'
###url