Re: Problem with AAC and AudioFile
Re: Problem with AAC and AudioFile
- Subject: Re: Problem with AAC and AudioFile
- From: William Stewart <email@hidden>
- Date: Fri, 23 Jan 2004 18:52:44 -0800
You imply that this is an either/or choice... It isn't. MPEG-4 AAC is
defined as a superset or re-definitions of *some* of the tools that are
first defined in MPEG-2 AAC. The low-complexity AAC profile is similar
between the two standards.
What we are talking about here with ADTS files, is NOT the encoder or
the decoder, but just a file format that can contain AAC data that was
defined first in MPEG-2.
ADTS is used for raw bit stream types of uses of AAC, and is a simple
file format for carrying AAC data around in. We're not expecting or
desiring that this would become a mechanism for distributing AAC data
around, but it does represents a lightweight and easy to parse
container for AAC. Some encoders that are available will output ADTS
files, so this seemed a reasonable option to us to provide support for
this in CA.
Bill
On 23/01/2004, at 6:08 PM, john wrote:
Just out of curiosity, why the decision to support the mpeg2 aac and
not mpeg4, considering the apparent rarity of mpeg2 aac and the
popularity of mpeg4?
-- John
No app claims MPEG-2 AAC as a file type so it will always have a
generic icon. If your app is going to create them then perhaps it
should supply an icon for them.
.aac is what you'd likely find out in the wild for those (very rare)
players which support MPEG-2 AAC
.mp2 is the de-facto file extension for MPEG-1, Layer 2 audio files
so don't use that.
stephen
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