83 lines
No EOL
3.3 KiB
HTML
83 lines
No EOL
3.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
|
<head>
|
|
<meta name="generator" content="PSPad editor, www.pspad.com" />
|
|
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
|
|
<link rel="stylesheet" type="text/css" href="styles/lame.css" />
|
|
<title>LAME MP3 Encoder :: Variable Bit Rate</title>
|
|
</head>
|
|
<body>
|
|
<div id="menu">
|
|
<ul>
|
|
<li><a href="index.html">Index page</a></li>
|
|
<li><a href="about.html">About LAME</a></li>
|
|
<li><a style="border: 0" href="introduction.html">Intro to encoding</a>
|
|
<div id="submenu">
|
|
<ul>
|
|
<li><a href="cbr.html">CBR </a></li>
|
|
<li><a href="abr.html">ABR </a></li>
|
|
<li><a href="vbr.html">VBR </a></li>
|
|
<li><a style="border: 0" href="ms_stereo.html">M/S Stereo</a></li>
|
|
</ul>
|
|
</div>
|
|
</li>
|
|
<li><a href="usage.html">Usage of LAME</a></li>
|
|
<li><a href="history.html">Version history</a></li>
|
|
<li><a href="contributors.html">Coders of LAME</a></li>
|
|
<li><a href="contact.html">Contact LAME</a></li>
|
|
<li><a style="border: 0" href="links.html">LAME links</a></li>
|
|
</ul>
|
|
</div>
|
|
<div id="container">
|
|
<div id="content">
|
|
|
|
<div align="center">
|
|
<img src="images/logo.gif" width="358" height="231" alt="LAME Official Logo" />
|
|
<h2 class="hilight">LAME - Variable Bit Rate</h2>
|
|
</div>
|
|
|
|
<p>Suggested usage:</p>
|
|
<blockquote class="code">lame -V2 input.wav output.mp3</blockquote>
|
|
|
|
<p>
|
|
In Variable Bitrate (VBR) coding, the user chooses a desired quality level
|
|
instead of a bitrate. A correct implementation should be able to maintain the
|
|
same quality perception, changing the bitrate to a higher or lower one whenever
|
|
the audio file is more or less complex. With MP3, this is not always possible.
|
|
</p>
|
|
<p>
|
|
VBR encoding is the logical way of encoding data. General data compressors (like
|
|
.zip and .rar) are VBR, as lossless codecs are as well. Being able to indicate
|
|
a quality value, the encoder decides for each frame, which is the most appropiate
|
|
bitrate to keep it.
|
|
</p>
|
|
<p>
|
|
The main advantage of using VBR is that the encoder will use the smallest amount
|
|
of bytes needed to keep the asked quality. The inconvenience is that the
|
|
file size is quite unpredictable, and can change from file to file in more than
|
|
50kbps. (or nearly double the size, with different genres and quasi-mono content)
|
|
</p>
|
|
</div>
|
|
<div id="footer">
|
|
|
|
<a href="http://sourceforge.net/projects/lame"><img src="http://sflogo.sourceforge.net/sflogo.php?group_id=290&type=12"
|
|
alt="Get LAME (Lame Aint an MP3 Encoder) at SourceForge.net. Fast, secure and Free Open Source software downloads"
|
|
border="0" height="30" width="120" /></a>
|
|
|
|
<a href="http://validator.w3.org/#validate_by_upload"><img src="images/valid-xhtml10.png"
|
|
alt="Valid XHTML 1.0 Transitional" border="0" height="31" width="88" /></a>
|
|
|
|
<a href="http://jigsaw.w3.org/css-validator/"><img src="images/valid-css.png"
|
|
alt="Valid CSS!" border="0" height="31" width="88" /></a>
|
|
|
|
<p>HTML markup and design by <a
|
|
href="http://www.rjamorim.com" target="_blank">Roberto Amorim</a> and <a
|
|
href="http://www.maresweb.de" target="_blank">Sebastian Mares</a>. Logo by <a
|
|
href="http://www.brightercreative.co.uk">Sam Fisher</a>.</p>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
</body>
|
|
</html> |