|Subject:||Re: [Linphone-developers] Why does Opus sound so bad on mobile|
|Date:||Fri, 6 Jun 2014 11:13:36 -0400|
Date: Thu, 5 Jun 2014 09:42:31 -0600
From: Steve Strobel <address@hidden>
Subject: Re: [Linphone-developers] Why does Opus sound so bad on
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Opus supports a very wide range of bit rates. Maybe the Linphone
implementations are using a much lower bit rate than your lab device.
On Fri, May 30, 2014 at 3:24 PM, Tom Hartnett <address@hidden>
> I've run some audio quality experiments and I'd appreciate some input.
> These cuts are best listened via headphones. All cuts are encoded at
> 64Kb/s mono. Audio was fed into phones via headset port.
> Here's a reference of the source I used:
> I then ran a test on Android via a G.722 (non Linphone) app:( The Linphone
> G.722 strangely samples at 8KHz so was unusable)
> as you can hear, not perfect, but normal bandwidth for G.722
> I then ran LinPhone Opus on the same phone:
> Many codec artifacts are present, inferior to G.722. I should note that
> echo canceler was off.
> I moved to iPhone and ran a G.722 app
> not bad
> Then to iPhone/LinPhone/Opus
> Not artifact heavy, but all low frequencies have been cut. Very tinny
> Finally, for reference, I did an encode/decode pass on one of our lab
> devices that uses Opus (no Linphone)
> Summary: Neither mobile implementation of Opus is superior to old
> fashioned G.722. Other implementations sound *much* better.
> We're trying to recommend Linphone mobile for broadcast purposes but with
> an inferior Opus implementation that's difficult. Any thoughts?
> Linphone-developers mailing list
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