//Ubuntu 10.04 i386 を /var/lucidi386/へインストール
# debootstrap --variant=buildd --arch=i386 lucid /var/lucidi386/ http://ftp.jaist.ac.jp/pub/Linux/ubuntu/

# mount -a

# cp /etc/passwd /var/lucidi386/etc
# cp /etc/shadow /var/lucidi386/etc
# cp /etc/group /var/lucidi386/etc
# cp /etc/gshadow /var/lucidi386/etc

# chroot /var/lucidi386
# apt-get install nano
# nano /etc/apt/sources.list

# apt-get update

# apt-get upgrade
# apt-get install sudo language-pack-ja
# gpasswd -a superbacker sudo #ホストのバージョンによっては必要

# apt-get install dchroot
# editor /etc/dchroot.conf

# dchroot -c lucid -d

libx264をビルド

ffmpegをビルド

$ CFLAGS=-march=native ./configure --enable-vdpau --enable-pthreads --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-shared --disable-static --enable-libx264 && make -j4 && sudo make install

http://d.hatena.ne.jp/munepi/20091227/1261941397#20091227f1 からプリセットを借りた

$ ffmpeg -i input.m2ts -vcodec libx264 -acodec copy -s 1280x720 -absf aac_adtstoasc -fpre libx264-hq-ts.ffpreset output.mp4

$ sudo chroot (mount point)

# mount /proc

# mount /sys

# mount /dev

# grub-install /dev/sd?

# umount /proc

# umount /sys

# umount /dev