[Speex-dev] CELT 0.5.0 is out

Aymeric Moizard jack at atosc.org
Thu Oct 16 02:36:14 PDT 2008

On Tue, 14 Oct 2008, Jean-Marc Valin wrote:

> Diana Cionoiu a écrit :
>> Hi Jean-Marc,
>> 1. Why CELT versus Speex?
> There's nearly no overlap between Speex and CELT. CELT is much higher
> quality, very low latency, and of course, higher bit-rate than Speex. So
> it really depends on the application.
>> 2. What's the RTP payload for CELT, so we can add it in Yate?
>> 3. What are the SDP declaration parameters?
> None of that is defined yet, though I'm open to suggestions on how to do
> the mapping.

CELT/44100 and CELT/48000
a=fmtp:105 stereo=on

probably a latency value?

"CELT" doesn't seems to be used for any other existing audio related
stuff? right?

I didn't read fully the doc...

One question for you Jean-Marc: can you confirm that the decoder
will receive enough information to autoconfigure itself when receiving
RTP streams? One documentation sentence seems to not go in that
direction while it's a requirement for VoIP and mainly for SIP


> 	Jean-Marc
>> Diana
>> Jean-Marc Valin wrote:
>>> Hi everyone,
>>> I'm happy to announce CELT version 0.5.0. This release includes
>>> simplifications to the bit allocation code and includes a new
>>> low-complexity mode that can be enabled (without breaking compatibility)
>>> on the encoder side. There are several other optimisations and bug fixes
>>> included. The API has also been slightly modified, so code using CELT
>>> will have to be updated (only minor changes required).
>>> You can download it from the website: http://www.celt-codec.org/
>>> Please note that the bit-stream still isn't frozen which means that 1)
>>> we can still improve things and 2) you can't rely on compatibility yet.
>>> Cheers,
>>>     Jean-Marc
>>> _______________________________________________
>>> Speex-dev mailing list
>>> Speex-dev at xiph.org
>>> http://lists.xiph.org/mailman/listinfo/speex-dev
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