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Re: [codec] Planning of further codec testing

Anisse Taleb <Anisse.Taleb@huawei.com> Fri, 05 August 2011 15:40 UTC

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Date: Fri, 05 Aug 2011 15:40:28 +0000
From: Anisse Taleb <Anisse.Taleb@huawei.com>
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To: Gregory Maxwell <gmaxwell@juniper.net>, Christian Hoene <christianhoene@googlemail.com>, "codec@ietf.org" <codec@ietf.org>
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Thread-topic: [codec] Planning of further codec testing
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Subject: Re: [codec] Planning of further codec testing
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Dear Christian, Gregory

Just a suggestion....to get an AAC-LD or ELD (enhanced low delay), encoder and decoder you probably would like to get in touch with the folks in FhG IIS (Markus Schnell or Ralf Geiger). I am not sure they would be willing to provide you with a complete suite of encoder and decoder, however, they could encode the items for you if you provide them with the input wavefiles...It's worth a shot.

I am personally skeptical to using the workaround suggested by Gregory, the encoder and decoder may be subject to some obscure EULA and it is not clear what delay this implementation has and the reported limited set of bitrates and actual quality. It is however a good fallback if FhG is unwilling to help with this.

Kind regards,
/Anisse
________________________________________
From: codec-bounces@ietf.org [codec-bounces@ietf.org] on behalf of Gregory Maxwell [gmaxwell@juniper.net]
Sent: 05 August 2011 16:26
To: Christian Hoene; codec@ietf.org
Subject: Re: [codec] Planning of further codec testing

Christian Hoene [christianhoene@googlemail.com] wrote:
> Does anybody know how to get an AAC-LD encoder and decoder?

I was hoping someone would provide a better answer:

There is an implementation of an AAC-LD encoder and decoder
included with Apple computers.  People with quicktime pro
installed are able to select it and write AAC-LD to mp4 files and
decode from them to wav.

As I recall the encoder's selection is some limited in terms of
supported sample/bitrates, and doesn't present pretty much
any options, I seem to recall it using the larger of the supported
frame sizes, and also having extensive bitres usage (not really
hard CBR).   "Take it or leave it".

If you use it you will want to be careful to check to see the
the files it wrote were what you wanted and not some other
codec.

I'm also not sure if it's a particularly good implementation or
not, but it seemed to work okay.


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