mp3.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from subprocess import check_call\n",
    "from datetime import datetime\n",
    "import itertools"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "audiofile = \"[INSERT DIRECTORY HERE]\\distant_clip.wav\"\n",
    "lame = \"[INSERT DIRECTORY HERE]\\lame.exe\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "n = 1000  # number of times to do the conversion\n",
    "name, ext = audiofile.split('.')\n",
    "filenames = [audiofile] + [name + str(i) + '_times' + '.mp3' for i in range(1, n+1)]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def convert_lame(filename, outfilename):\n",
    "    check_call([\n",
    "        lame,\n",
    "        '-V5',  # avg. 130 kbps\n",
    "        filename,\n",
    "        outfilename\n",
    "    ],\n",
    "    )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# see https://docs.python.org/3/library/itertools.html\n",
    "# for more cool tricks\n",
    "def pairwise(iterable):\n",
    "    \"s -> (s0,s1), (s1,s2), (s2, s3), ...\"\n",
    "    a, b = itertools.tee(iterable)\n",
    "    next(b, None)\n",
    "    return zip(a, b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Done. (0:05:29.945580)\n"
     ]
    }
   ],
   "source": [
    "start = datetime.now()\n",
    "for infile, outfile in pairwise(filenames):\n",
    "    convert_lame(infile, outfile)\n",
    "end = datetime.now()\n",
    "print('Done. (' + str(end - start) + ')')"
   ]
  }
 ],
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