opus - Jul 2009 - CELT 0.6.0 released, submitted as IETF draft

Hi everyone,

I'm pleased to announce version 0.6.0 of CELT, with many quality
improvements. This includes better stereo coupling, better handling of
transients, and better handling of highly tonal signals. In addition,
packet loss robustness has been improved through the optional use of
independent (intra) frames. CELT now supports a larger dynamic range,
suitable for encoding 24-bit audio (float version only). There is also a
very early VBR implementation.

Now, 0.6.0 is also the version that just got submitted as an "IPR-free
codec" Internet draft:
http://www.ietf.org/internet-drafts/draft-valin-celt-codec-00.txt

For those who aren't aware of it, there is an ongoing discussion about
creating an IETF working group for standardising unencumbered audio
codecs that everyone can use. There will be a BoF at the next IETF
meeting (26-31 July) in Stockholm to discuss that. I encourage those
interested in taking part in the mailing list discussion (
https://www.ietf.org/mailman/listinfo/codec ) and/or attending the BoF
in Stockholm. I will be co-chairing this BoF with Jason Fischl from Skype.

Cheers,

	Jean-Marc

Hi,
> I'm pleased to announce version 0.6.0 of CELT, with many quality
> improvements. This includes better stereo coupling, better handling of
> transients, and better handling of highly tonal signals. In addition,
> packet loss robustness has been improved through the optional use of
> independent (intra) frames. CELT now supports a larger dynamic range,
> suitable for encoding 24-bit audio (float version only). There is also a
> very early VBR implementation.
>
> Now, 0.6.0 is also the version that just got submitted as an "IPR-free
> codec" Internet draft:
> http://www.ietf.org/internet-drafts/draft-valin-celt-codec-00.txt
>
> For those who aren't aware of it, there is an ongoing discussion about
> creating an IETF working group for standardising unencumbered audio
> codecs that everyone can use. There will be a BoF at the next IETF
> meeting (26-31 July) in Stockholm to discuss that. I encourage those
> interested in taking part in the mailing list discussion (
> https://www.ietf.org/mailman/listinfo/codec ) and/or attending the BoF
> in Stockholm. I will be co-chairing this BoF with Jason Fischl from Skype.
Does this mean that the bit format is now stable?

Regards,
Peter

Congrats JM. I've been looking forward to 0.6.0 for a while now, and 
I've just integrated it into my app and it works great. I have just one 
question though. I realize that the VBR implementation is brand-new and 
isn't finished yet, but I would like to use it and was wondering if you 
could give us all some idea of how you envision the VBR eventually 
working (in other words, how the VBR parameter would affect the 
bit-rate). Right now it appears to give me about half the bit-rate I ask 
for when encoding silence, bit will sometimes increase up to around the 
full bit-rate on occasion depending on the audio.

Thanks,

John Ridges

celt-dev-request at xiph.org wrote:
> Message: 1
> Date: Sun, 05 Jul 2009 20:37:40 -0400
> From: Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>
> Subject: [CELT-dev] CELT 0.6.0 released, submitted as IETF draft
> To: celt-dev <celt-dev at xiph.org>
> Message-ID: <4A514754.4020101 at usherbrooke.ca>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi everyone,
>
> I'm pleased to announce version 0.6.0 of CELT, with many quality
> improvements. This includes better stereo coupling, better handling of
> transients, and better handling of highly tonal signals. In addition,
> packet loss robustness has been improved through the optional use of
> independent (intra) frames. CELT now supports a larger dynamic range,
> suitable for encoding 24-bit audio (float version only). There is also a
> very early VBR implementation.
>
> Now, 0.6.0 is also the version that just got submitted as an "IPR-free
> codec" Internet draft:
> http://www.ietf.org/internet-drafts/draft-valin-celt-codec-00.txt
>
> For those who aren't aware of it, there is an ongoing discussion about
> creating an IETF working group for standardising unencumbered audio
> codecs that everyone can use. There will be a BoF at the next IETF
> meeting (26-31 July) in Stockholm to discuss that. I encourage those
> interested in taking part in the mailing list discussion (
> https://www.ietf.org/mailman/listinfo/codec ) and/or attending the BoF
> in Stockholm. I will be co-chairing this BoF with Jason Fischl from Skype.
>
> Cheers,
>
> 	Jean-Marc
>
>
>