Blade ou Lame c'est l'encodeur, prend Lame et pose pas questions 
Pour le VBR/CBR :
What is Variable Bitrate (VBR) Encoding?
Variable Bitrate encoding is a method that ensures consistently high audio quality throughout an encoded file by making intelligent bit-allocation decisions during the encoding process based on a scale you set in the XingMP3 Encoder settings dialog.
When the Encoder encounters difficult sections in the audio source (for example, sections containing a relatively wide stereo separation), it allocates additional bits to that section, ensuring the audio quality.
When the Encoder encounters easy sections (for example, sections containing silence or a relatively narrow stereo separation), it allocates fewer bits to the section, reducing unused bits.
As a result, your MP3 file consists of variable bitrates throughout the file because the Encoder puts the bits where they are most needed.
When to Use Variable Bitrate (VBR) Encoding
VBR encoding was developed for use when consistent audio quality is the top priority and constant or predictable encoded MP3 file size is not critical.
Variable Bitrate (VBR) Encoding Restrictions
· Because a VBR-encoded MP3 file consists of variable bitrates throughout the file, the MP3 file size is not easily predicted. Variable Bitrate encoding should not be used when you need to predict and/or limit the size of the MP3 file.
· Many MP3 players may inaccurately report the duration of VBR-encoded files. If the MP3 player cannot accurately determine the time, seeking in the file may also be unpredictable.
What is Constant Bitrate (CBR) Encoding?
Constant Bitrate Encoding is a method that ensures a consistent bitrate throughout an encoded file at the expense of audio quality and/or Encoder efficiency. The Encoder allocates the same number of bits to difficult sections (for example, sections containing a relatively wide stereo separation), and easy sections (for example, sections containing silence or a relatively narrow stereo separation). As a result, difficult sections may suffer quality degradation while easy sections may include unused bits.
When to Use Constant Bitrate (CBR) Encoding
Use CBR encoding when you need to limit the size of the MP3 file or produce consistent and predictable file sizes.
Constant Bitrate (CBR) Encoding Benefits
CBR encoding produces MP3 file sizes that are easily predicted by multiplying the bitrate by the Duration.
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