Streaming AAC+

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  • August 13, 2011 at 11:27 pm #9923
    JesseG
    Member

    [quote author=”GuntherM”]We switched yesterday to 128kbps AAC+[/quote]
    with AAC at 96kbps or above, you should be using the Low Complexity profile, aka LC-AAC, aka "regular" "normal" AAC, you’ll get a more transparent sound from it… and you won’t sound like 22kHz sample rate on players that don’t support HE/PS profiles. 8)

    August 14, 2011 at 7:14 am #9924
    GuntherM
    Member

    [quote author=”JesseG”][quote author=”GuntherM”]We switched yesterday to 128kbps AAC+[/quote]
    with AAC at 96kbps or above, you should be using the Low Complexity profile, aka LC-AAC, aka "regular" "normal" AAC, you’ll get a more transparent sound from it… and you won’t sound like 22kHz sample rate on players that don’t support HE/PS profiles. 8)[/quote]

    Ok thx JesseG,

    switched to LC-AAC @ 128Kbps, must say it sound more open 🙂
    Thx for the tip!

    Grtz
    Gunther

    August 15, 2011 at 8:53 pm #9925
    timmywa
    Participant

    How much difference are we going to "see" between a 128kb/s MP3 stream and a 128kb/s LC-AAC stream? I’ve listened on and off but I just don’t have the ears to hear much difference in detail.

    Thanks.

    August 16, 2011 at 12:48 am #9926
    JesseG
    Member

    [quote author=”timmywa”]How much difference are we going to "see" between a 128kb/s MP3 stream and a 128kb/s LC-AAC stream? I’ve listened on and off but I just don’t have the ears to hear much difference in detail.[/quote]
    It really depends on the program material. I’ve been fortunate enough to have spent considerable time to blind ABX my way down to that certain version of Lame we know and love now… So it’s probably not even fair to be comparing any old LC-AAC to it. The same research would have to be done for LC-AAC in order to compare the best to the best.

    Another good example of that is that Lame/settings, against 320kbps joint stereo mp3 as encoded by iTunes’ crazy messed up "tweaked" FhG. There are probably not many tracks that the iTunes mp3 would actually win on.

    The advantages that LC-AAC has are several fold, but this, I personally think, is one of the biggest differences to mp3…

    quote :

    AAC encoders can switch dynamically between a single MDCT block of length 1024 points or 8 blocks of 128 points (or between 960 points and 120 points, respectively).

    • If a signal change or a transient occurs, 8 shorter windows of 128/120 points each are chosen for their better temporal resolution.
    • By default, the longer 1024-point/960-point window is otherwise used because the increased frequency resolution allows for a more sophisticated psychoacoustic model, resulting in improved coding efficiency.
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