jmvalin: (Default)
[personal profile] jmvalin
I've been doing some tuning of CELT over the past few days and thought it would be a interesting to compare how the quality of CELT has evolved over the coarse of its development. It's easy to lose track when each change you made provides only a tiny improvement. Using this stereo reference file, I've tried encoding with a few different versions. Even though I don't normally recommend using that bit-rate for stereo, I've used 40 kb/s for the comparison because it makes the artefacts (and thus the differences) more obvious. A bit more than two years ago, this is what CELT 0.3.2 sounded like at 40 kb/s. Then there was version 0.5.2 that improved, with the latest version, 0.8.1. And now, here's what in the current git to be released as 0.9.

OK, I know the quality isn't that good at such a low rate, so here's a slightly higher bit-rate. This is current git at 64 kb/s, compared to G.719 at the same rate. I'm curious to hear comments about how CELT does compared to G.719 because we haven't done any formal comparison yet on music.

Even at 64 kb/s, the artefacts are generally audible, even though they're usually no longer annoying. They start being less audible at 80 kb/s, as you can see, and then the quality continues going up all the way to 256 kb/s or even higher.
From:
Anonymous( )Anonymous This account has disabled anonymous posting.
OpenID( )OpenID You can comment on this post while signed in with an account from many other sites, once you have confirmed your email address. Sign in using OpenID.
User
Account name:
Password:
If you don't have an account you can create one now.
Subject:
HTML doesn't work in the subject.

Message:

 
Notice: This account is set to log the IP addresses of everyone who comments.
Links will be displayed as unclickable URLs to help prevent spam.

Profile

jmvalin: (Default)
jmvalin

June 2017

S M T W T F S
    123
45678910
11121314151617
1819 2021222324
252627282930 

Most Popular Tags

Style Credit

Expand Cut Tags

No cut tags
Page generated Sep. 24th, 2017 09:00 pm
Powered by Dreamwidth Studios