Jean-Marc Valin
2009-Jul-06 00:37 UTC
[CELT-dev] 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
Peter Robinson
2009-Jul-06 10:20 UTC
[CELT-dev] CELT 0.6.0 released, submitted as IETF draft
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 > > >