extract-audio

OK, not Python - but sometime bash is a better tool.

#!/bin/bash
# Extract audio from video files
# Uses ffmpeg and lame

# Miki Tebeka <miki.tebeka@gmail.com>

if [ $# -ne 2 ]; then
    echo "usage: `basename $0` INPUT_VIDEO OUTPUT_MP3"
    exit 1
fi

infile=$1
outfile=$2

if [ ! -f $infile ]; then
    echo "error: can't find $infile"
    exit 1
fi

if [ -f $outfile ]; then
    echo "error: $outfile exists"
    exit 1
fi

fifoname=/tmp/encode.$$
mkfifo $fifoname
mplayer -vc null -vo null -ao pcm:fast -ao pcm:file=$fifoname $1&
lame $fifoname $outfile
rm $fifoname