1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4 <head> 5 <meta name="generator" content="PSPad editor, www.pspad.com" /> 6 <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> 7 <link rel="stylesheet" type="text/css" href="styles/lame.css" /> 8 <title>About the LAME encoder</title> 9 </head> 10 <body> 11<div id="menu"> 12 <ul> 13 <li><a href="index.html">Index page</a></li> 14 <li><a href="about.html">About LAME</a></li> 15 <li><a href="introduction.html">Intro to encoding</a></li> 16 <li><a href="usage.html">Usage of LAME</a></li> 17 <li><a href="history.html">Version history</a></li> 18 <li><a href="contributors.html">Coders of LAME</a></li> 19 <li><a href="contact.html">Contact LAME</a></li> 20 <li><a style="border: 0" href="links.html">LAME links</a></li> 21 </ul> 22</div> 23<div id="container"> 24<div id="content"> 25 <div align="center"> 26 <img src="images/logo.gif" width="358" height="231" alt="LAME Official Logo" /> 27 <h2 class="hilight">About LAME</h2> 28 </div> 29 <p> 30 LAME development started around mid-1998. Mike Cheng started it as a patch 31 against the 8hz-MP3 encoder sources. After some quality concerns raised by 32 others, he decided to start from scratch based on the dist10 sources. His 33 goal was only to speed up the dist10 sources, and leave its quality untouched. 34 That branch (a patch against the reference sources) became Lame 2.0, and not 35 until Lame 3.81 (May 2000) the latest remainings of dist10 code were removed, 36 making LAME no more only a patch. 37 </p> 38 <p> 39 The project quickly became a team project. Mike Cheng eventually left 40 leadership and started working on tooLame, an MP2 encoder. Mark Taylor became 41 leader and started pursuing increased quality in addition to better speed. He 42 can be considered the initiator of the LAME project in its current form. He 43 released version 3.0 featuring gpsycho, a new psychoacoustic model he 44 developed. 45 </p> 46 <p> 47 In early 2003 Mark left project leadership, and since then the project has 48 been lead through the cooperation of the active developers (currently 4 49 individuals). 50 </p> 51 <p> 52 Today, LAME is considered the best MP3 encoder at mid-high bitrates and at 53 VBR<a href="#note1"><sup>1</sup></a>, mostly thanks to the dedicated work of its developers and the open 54 source licensing model that allowed the project to tap into engineering 55 resources from all around the world. Both quality and speed improvements are 56 still happening, probably making LAME the only MP3 encoder still being 57 actively developed. 58 </p> 59 <h3>LAME features:</h3> 60 <ul> 61 <li> 62 Supports MPEG1, MPEG2 and MPEG2.5<a href="#note2"><sup>2</sup></a> layer III encoding. 63 </li> 64 <li> 65 Encodes in CBR (constant bitrate) and in two types of variable bitrate, VBR and ABR<a 66 href="#note3"><sup>3</sup></a>, as well as freeformat. 67 </li> 68 <li> 69 Supports mono and stereo signals. Stereo signals are encoded by default with 70 an advanced algorithm<a href="#note4"><sup>4</sup></a> to maximize the quality. 71 </li> 72 <li> 73 Tuned default parameters for optimum encoding. 74 </li> 75 <li> 76 Fast. Encodes to -V 2 at 17 times realtime on a P4 2.8Ghz. 77 </li> 78 <li> 79 Uses an advanced psycho acoustic and noise shaping model improved during years. 80 </li> 81 <li> 82 Developed under the <a href="http://www.gnu.org/licenses/lgpl.html">LGPL</a> 83 GNU license 84 </li> 85 </ul> 86 <div id="notes"> 87 <ol> 88 <li><a name="note1"></a> See the results of <a href="http://listening-tests.hydrogenaudio.org/sebastian/"> 89 several blind tests</a> conducted by hydrogenaudio members. 90 </li> 91 <li><a name="note2"></a> MPEG1 sample rates are 32Khz, 44.1Khz and 48Khz. 92 <br/> 93 MPEG2 sample rates are 16Khz, 22.05Khz and 24Khz. 94 <br/> 95 MPEG 2.5 does not exist as a standard. It is an extension from 96 <a href="http://www.fraunhofer.de/">fraunhofer</a> that added the possibility 97 to encode in 8Khz, 11,025Khz and 12Khz. 98 </li> 99 <li><a name="note3"></a> See <a href="vbr.html">Variable Bit Rate</a> and 100 <a href="abr.html">Average Bit Rate (ABR)</a>. 101 </li> 102 <li><a name="note4"></a> The stereo encoding of LAME automatically switches between 103 Mid-Side and simple-stereo to maximize the available bits while preserving the 104 quality. More info in <a href="ms_stereo.html">Mid/Side Stereo</a> 105 </li> 106 </ol> 107 </div> 108</div> 109<div id="footer"> 110 111<a href="http://sourceforge.net/projects/lame"><img src="images/sflogo.gif" 112 alt="Get LAME (Lame Aint an MP3 Encoder) at SourceForge.net. 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