Talk:High-Efficiency Advanced Audio Coding

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iPod/iTunes support[edit]

220.253.77.88 21:32, 13 May 2007 (UTC)"As of 2007, neither iTunes, nor iPod does support HE-AAC. Only MPEG 2 AAC (MPEG 2 Audio - part 3) is supported so the only players for Mac OS X are VLC (without metadata/title streaming) and Songbird."[reply]

Is this statement specific to streaming, because iPod supports MPEG-4 AAC?

Sort of. Don't confuse the MPEG-4 container format (denoted by filename extension) with the MPEG-4 High Efficiency extensions to MPEG-2's Low Complexity AAC. As I understand it, currently, no AAC streaming whatsoever is supported by iTunes. Playback of static LC-AAC files is possible, but I don't know if the LC-AAC data has to be in an MPEG-4 container or if raw .aac will play as well. According to the iTunes article, HE-AAC static files are playable but they're decoded at 22 kHz, thus cutting off the high end (and making the rest sound slightly fuzzier). I don't know if iPod's capabilities match those of iTunes. —mjb 21:51, 13 May 2007 (UTC)[reply]

MPEG-2 Part ????[edit]

The article talks abut AAC being part of MPEG-2 Part 3, but the AAC article says it is MPEG-2 part 7 and MPEG-4 part 3. So is the HE-AAC article incorrect or is the AAC article? (or is there some other reason that perhaps could use some explanation?)--Jccalhoun 16:59, 17 May 2007 (UTC)[reply]

Dolby turns HE-AAC v2 into Dolby Pulse[edit]

It seems as if, now that Dolby has acquired Coding Technologies, they've created a new Dolby product, Dolby Pulse, that is more or less just HE-AAC v2 with 'Dolby metadata'. Obviously, this will need to be mentioned, but my question is:

Do we mention Dolby Pulse as a part of HE-AAC v2, or do we move all the article's contents to Dolby Pulse with relevant additional information?

I would have also suggested creating two seperate articles but the overlap between the two articles would not have justified that decision.

--Nerd 101 (talk) 11:12, 10 December 2008 (UTC)[reply]

Support[edit]

In the 'Decoding' subsection of the 'Support' section, the third para begins "Only MPEG 2 AAC (MPEG-4 Audio - part 3) is supported...". This seems out of context, and it's not stated on what "only MPEG 2 AAC" is supported on. Perhaps this paragraph should be removed until it's clearer. --WabsBio (talk) 13:22, 13 January 2009 (UTC)[reply]

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Encoding quality[edit]

Lossy Codec table, position relative to others
Format Popularity Q<80kbps Q>128kbps
MP3 5 1 2
M4A/AAC 4* 4 4
WMA 3 5*** 1
OGG 2 3 3
OPUS 1 2** 5

This table should aid in what encoder to choose for which purposes.

Position is relative to others, and not an indication of encoder quality.

Rated from '5' (the highest position), to '1' (the lowest position).

Table headers representing: 

"Format" : Type of encoder
"Popularity" : Supported by devices like Smart TVs, Car radios, MP3 players, etc..; A larger value means more compatible devices
"Q<80kbps" : Low bitrate encoding quality per size, representing mostly audio books and streaming data.; A larger value means smaller file size
"Q>128kbps" : high bitrate encoding quality per size, Representing mostly audio music; A larger value means better audio quality.

*  M4A/AAC received this rating, mainly due to Apple products, and M4A/M4V being the 'default' codec of Youtube.
** Opus received this rating due to the fact that outside the automatic settings, it underperformed on all bitrates compared to the competition
***WMA has received this rating, due to the many encoding options in WMA9.2 low bitrate, as well as WMA10 VBR; and WMA's built in Crystallizer.
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