On 31 Okt, Roman Korcek wrote:
> and thanks for the comments. So as far as I understand, the quality
> with VBR and ABR are like curves and CBR is like a line (if you
> imagine a graph with x being bitrate from 32 to 320 and y being
> quality from worst to best) - with VBR you get the best quality at
No.
With CBR (Constant BitRate) the bitrate is constant and the quality
varies depending on the complexity of the input. You know how large the
file will be, but you didn't know how good it sounds. You also can make
a life stream over a network because you know exactly how large the
bandwith needs to be.
With VBR (Variable BitRate) the quality is (sort of) constant and the
bitrate varies depending on the complexity of the input. You (sort of)
know how good it will sound, but you didn't know how large the file will
be. You also can't make life stream of the input over a network with a
specific bandwith, because you didn't know if the needed bandwith
exceeds the bandwith you have on the network.
With ABR (Average BitRate) we try to archive an average bitrate of the
file, e.g. if we specify an average bitrate of 128k, and we have two
frames which only need 64k to be of a good quality, we can just use
these 64k for those frames and now we are able to use 256k in the next
frame to get a better quality there. With ABR you know how large the
file will be, and you know the quality will be better than with CBR. You
also can make a life stream over a network, because ABR makes sure this
will be possible.
VBR may be better if filesize or streaming doesn't concerns you, but
this depends on the quality of the VBR algorithm. There are examples
where VBR isn't as good as a specific ABR or CBR setting, but as usual,
this depends on the input signal. And CBR isn't flawless too. So just
listen to the encoded result and decide yourself (there are a lot of
people which think VBR is good enough for daily use).
If you need to meet a spefic filesize or want to stream the encoding
over a network, forget about VBR, use ABR.
Bye,
Alexander.
--
Give a man a fish and you feed him for a day;
teach him to use the Net and he won't bother you for weeks.
http://www.Leidinger.net Alexander @ Leidinger.net
GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7
_______________________________________________
mp3encoder mailing list
[EMAIL PROTECTED]
http://minnie.tuhs.org/mailman/listinfo/mp3encoder
