HE-AAC: Matching sampling rate with bit rate

[adoniscik]

In other words, I want to know how many bits to assign a given bandwidth, or vice versa. My intention is to stream audio over the Web, so I am considering HE-AAC in a Quicktime container.

[SeeMoreDigital]

In other words, I want to know how many bits to assign a given bandwidth, or vice versa. My intention is to stream audio over the Web, so I am considering HE-AAC in a Quicktime container.Although Quicktime player can play AAC-HE audio, it cannot decode the SBR element.

When generating A/V encodes for my clients web sites I use AAC-HE audio at 64Kbps with a sample rate of either 22.05 (-> 44.1) or 24.0 (-> 48.0) KHz - depending on the input sample rate.


Cheers

[adoniscik]

Although Quicktime player can play AAC-HE audio, it cannot decode the SBR element.
Thank you very much. That would make HE-AAC a bad choice for the moment. I will stick to LC-AAC until Quicktime gets an upgrade.

[shon3i]

Thank you very much. That would make HE-AAC a bad choice for the moment. I will stick to LC-AAC until Quicktime gets an upgrade.
Why, why you need quicktime container, AAC-LC @ <=64 will sound very disapointing, aslo why you not just use mp4 container like on shoutcast where have radio stations encoded at 24kbps AAC-HE and sounds 10 times better than AAC-LC @ 64 and higer

[adoniscik]

...because it is a video. I am considering using 64kbps 32Khz AAC-LC. What do you think?

[shon3i]

Ok, but i think to use 24-64 44-48khz HE-AAC, but QT can't play propertly SBR so you don't have choices, 64 LC-AAC is good, better than MP3 @ 64, but have cutoff @ 12khz so iz not real 32khz.

[adoniscik]

There must be a poor lowpass filter! You would expect to get at least 14Khz out of a 32Khz sampling rate.

[shon3i]

There must be a poor lowpass filter! You would expect to get at least 14Khz out of a 32Khz sampling rate.
Right, so far i knew all good AAC encoders (apple, coding tech, nero)don't have lowpass tweaking, aslo 14khz is too much because mp3 @ 128 have 16khz cutoff, only one encoder have it. That is FAAC but he have other very problematic low bitrate encodings, 64kbps will sound much whrost than mp3 @ 64.

So you encode @ 64 LC-AAC, and BeHappy, and wait for QT HE update.

Cheers