[MPlayer-users] stream with AAC plus version 2 codec - how to recognise it ?

[Reimar Döffinger]

On 10.04.2013, at 15:24, Goga777 <goga777 at bk.ru> wrote:
> is it possible to recognize in mplayer logs that stream is using AACplus v2 ?
> for example - does it stream use aacplus v2 ? 

It would help if you explained what the purpose is, "plus" and "v2" are really marketing terms.
Which do _not_ mean good quality but only indicate how much effort went into applying makeup onto the pig know as "crappy low-bitrate stream"

> 5 - icy-br:32
> --- HTTP DEBUG HEADER --- END ---
> Name   : Moskva audio streamer
> Public : yes
> Bitrate: 32kbit/s

So it's 32 kbit/s. That means it isn't really possible to properly code anything above 20kHz mono.

> AUDIO: 44100 Hz, 2 ch, s16le, 0.0 kbit/0.00% (ratio: 0->176400)

That it decodes to 44100 means that SBR (also known as the "plus" part) must have been used to "make up" extra frequency information.
It's also stereo, so it uses PS (aka the v2 as far as I can tell).

> [aac @ 0x8c0a120]Reserved SBR extensions are not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

Also it uses either some mystery feature or the encoder is kind of broken...