1159b3361Sopenharmony_ci<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 2159b3361Sopenharmony_ci "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3159b3361Sopenharmony_ci<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4159b3361Sopenharmony_ci <head> 5159b3361Sopenharmony_ci <meta name="generator" content="PSPad editor, www.pspad.com" /> 6159b3361Sopenharmony_ci <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> 7159b3361Sopenharmony_ci <link rel="stylesheet" type="text/css" href="styles/lame.css" /> 8159b3361Sopenharmony_ci <title>LAME MP3 Encoder :: Variable Bit Rate</title> 9159b3361Sopenharmony_ci </head> 10159b3361Sopenharmony_ci <body> 11159b3361Sopenharmony_ci<div id="menu"> 12159b3361Sopenharmony_ci <ul> 13159b3361Sopenharmony_ci <li><a href="index.html">Index page</a></li> 14159b3361Sopenharmony_ci <li><a href="about.html">About LAME</a></li> 15159b3361Sopenharmony_ci <li><a style="border: 0" href="introduction.html">Intro to encoding</a> 16159b3361Sopenharmony_ci <div id="submenu"> 17159b3361Sopenharmony_ci <ul> 18159b3361Sopenharmony_ci <li><a href="cbr.html">CBR </a></li> 19159b3361Sopenharmony_ci <li><a href="abr.html">ABR </a></li> 20159b3361Sopenharmony_ci <li><a href="vbr.html">VBR </a></li> 21159b3361Sopenharmony_ci <li><a style="border: 0" href="ms_stereo.html">M/S Stereo</a></li> 22159b3361Sopenharmony_ci </ul> 23159b3361Sopenharmony_ci </div> 24159b3361Sopenharmony_ci </li> 25159b3361Sopenharmony_ci <li><a href="usage.html">Usage of LAME</a></li> 26159b3361Sopenharmony_ci <li><a href="history.html">Version history</a></li> 27159b3361Sopenharmony_ci <li><a href="contributors.html">Coders of LAME</a></li> 28159b3361Sopenharmony_ci <li><a href="contact.html">Contact LAME</a></li> 29159b3361Sopenharmony_ci <li><a style="border: 0" href="links.html">LAME links</a></li> 30159b3361Sopenharmony_ci </ul> 31159b3361Sopenharmony_ci</div> 32159b3361Sopenharmony_ci<div id="container"> 33159b3361Sopenharmony_ci<div id="content"> 34159b3361Sopenharmony_ci <div align="center"> 35159b3361Sopenharmony_ci <img src="images/logo.gif" width="358" height="231" alt="LAME Official Logo" /> 36159b3361Sopenharmony_ci <h2 class="hilight">LAME - Variable Bit Rate</h2> 37159b3361Sopenharmony_ci </div> 38159b3361Sopenharmony_ci <p>Suggested usage:</p> 39159b3361Sopenharmony_ci <blockquote class="code">lame -V2 input.wav output.mp3</blockquote> 40159b3361Sopenharmony_ci <p> 41159b3361Sopenharmony_ci In Variable Bitrate (VBR) coding, the user chooses a desired quality level 42159b3361Sopenharmony_ci instead of a bitrate. A correct implementation should be able to maintain the 43159b3361Sopenharmony_ci same quality perception, changing the bitrate to a higher or lower one whenever 44159b3361Sopenharmony_ci the audio file is more or less complex. With MP3, this is not always possible. 45159b3361Sopenharmony_ci </p> 46159b3361Sopenharmony_ci <p> 47159b3361Sopenharmony_ci VBR encoding is the logical way of encoding data. General data compressors (like 48159b3361Sopenharmony_ci .zip and .rar) are VBR, as lossless codecs are as well. Being able to indicate 49159b3361Sopenharmony_ci a quality value, the encoder decides for each frame, which is the most appropiate 50159b3361Sopenharmony_ci bitrate to keep it. 51159b3361Sopenharmony_ci </p> 52159b3361Sopenharmony_ci <p> 53159b3361Sopenharmony_ci The main advantage of using VBR is that the encoder will use the smallest amount 54159b3361Sopenharmony_ci of bytes needed to keep the asked quality. The inconvenience is that the 55159b3361Sopenharmony_ci file size is quite unpredictable, and can change from file to file in more than 56159b3361Sopenharmony_ci 50kbps. (or nearly double the size, with different genres and quasi-mono content) 57159b3361Sopenharmony_ci </p> 58159b3361Sopenharmony_ci</div> 59159b3361Sopenharmony_ci<div id="footer"> 60159b3361Sopenharmony_ci 61159b3361Sopenharmony_ci<a href="http://sourceforge.net/projects/lame"><img src="images/sflogo.gif" 62159b3361Sopenharmony_ci alt="Get LAME (Lame Aint an MP3 Encoder) at SourceForge.net. 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