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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<link rel="stylesheet" type="text/css" href="styles/lame.css" />
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<title>LAME MP3 Encoder :: Variable Bit Rate</title>
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<body>
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Index page
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About LAME
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Intro to encoding
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CBR
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ABR
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VBR
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M/S Stereo
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Usage of LAME
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Version history
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Coders of LAME
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Contact LAME
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LAME links
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LAME - Variable Bit Rate
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Suggested usage:
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lame -V2 input.wav output.mp3
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In Variable Bitrate (VBR) coding, the user chooses a desired quality level
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instead of a bitrate. A correct implementation should be able to maintain the
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same quality perception, changing the bitrate to a higher or lower one whenever
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the audio file is more or less complex. With MP3, this is not always possible.
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VBR encoding is the logical way of encoding data. General data compressors (like
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.zip and .rar) are VBR, as lossless codecs are as well. Being able to indicate
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a quality value, the encoder decides for each frame, which is the most appropiate
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bitrate to keep it.
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The main advantage of using VBR is that the encoder will use the smallest amount
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of bytes needed to keep the asked quality. The inconvenience is that the
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file size is quite unpredictable, and can change from file to file in more than
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50kbps. (or nearly double the size, with different genres and quasi-mono content)
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alt="Get LAME (Lame Aint an MP3 Encoder) at SourceForge.net. Fast, secure and Free Open Source software downloads"
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border="0" height="30" width="120" />
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alt="Valid XHTML 1.0 Transitional" border="0" height="31" width="88" />
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HTML markup and design by
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href="http://www.rjamorim.com" target="_blank">Roberto Amorim and
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href="http://www.maresweb.de" target="_blank">Sebastian Mares. Logo by
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href="http://www.brightercreative.co.uk">Sam Fisher.
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</body>
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</html>
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