Pour ceux qui comme moi ne connaissait pas le VBR, voici un extrait
D'après ce que j'ai compris c'est pour éviter de stocker ce qui n'est pas utile.
J'apparente un peu ca au stockage d'une chaine de caractère à longueur variable ou la première information serait la longueur de la chaine.
A noter qu'il existe des MP3 VBR aussi.
Extrait :
Q: Ogg Vorbis uses a technology called VBR (variable bit rate).
It's not so much a technology as a description. It's like calling the color red a technology.
This is great for allowing listeners a smoother listening experience over the internet. But, another important role of VBR is conservation, correct? I mean will overall server space and bandwidth be reduced making the Internet a better place for everyone?
Size and quality are always related in a lossy perceptual codec like mp3, WMA or Ogg. When a compression, like Ogg, improves on the current state of the art, it fits more information into a physical number of bits. So you can put it either way: "Ogg files can be smaller and sound just as good", or "Ogg files sound better for the same size."
What VBR does is prevent wasting bits on stupidly encoding unnecessary information just because we *must* fill the space *now*. We can use the saved space later for harder parts (increasing quality for the same size), or we can hoard the savings (decreasing size for the same quality).
# Re: Ogg Vorbis supporté par le lecteurs CD IMP550 d'iRiver
Posté par spell (site web personnel) . En réponse à la dépêche Ogg Vorbis supporté par le lecteurs CD IMP550 d'iRiver. Évalué à 0.
Pour ceux qui comme moi ne connaissait pas le VBR, voici un extrait
D'après ce que j'ai compris c'est pour éviter de stocker ce qui n'est pas utile.
J'apparente un peu ca au stockage d'une chaine de caractère à longueur variable ou la première information serait la longueur de la chaine.
A noter qu'il existe des MP3 VBR aussi.
Extrait :
Q: Ogg Vorbis uses a technology called VBR (variable bit rate).
It's not so much a technology as a description. It's like calling the color red a technology.
This is great for allowing listeners a smoother listening experience over the internet. But, another important role of VBR is conservation, correct? I mean will overall server space and bandwidth be reduced making the Internet a better place for everyone?
Size and quality are always related in a lossy perceptual codec like mp3, WMA or Ogg. When a compression, like Ogg, improves on the current state of the art, it fits more information into a physical number of bits. So you can put it either way: "Ogg files can be smaller and sound just as good", or "Ogg files sound better for the same size."
What VBR does is prevent wasting bits on stupidly encoding unnecessary information just because we *must* fill the space *now*. We can use the saved space later for harder parts (increasing quality for the same size), or we can hoard the savings (decreasing size for the same quality).
(source : http://membrane.com/ogg_vorbis.html(...) )