[FFmpeg-devel] [PATCH] avcodec: Remove libaacplus

[Paul B Mahol]

On 1/29/16, Timothy Gu <timothygu99 at gmail.com> wrote:
> On Mon, Jan 25, 2016 at 01:16:56PM +0100, Michael Niedermayer wrote:
>> On Sun, Jan 24, 2016 at 09:50:01AM -0800, Timothy Gu wrote:
>> > It's inferior to fdk-aac and has an arguably more problematic
>> > license.
>
>> a reference to the comparision finding its inferriority should be
>> added to the commit message
>
> A HydrogenAudio user reported:
>
>     It has however one huge advantage: much better quality at low bitrates
>     than faac and libaacplus.
>
> https://hydrogenaud.io/index.php?PHPSESSID=ckiq394pdglka0kj2fin6ij8t7&topic=95989.msg804633#msg804633
>
> I myself have made a few spectrograms for a comparison of the two encoders
> (thanks Paul for showspectrumpic!). The source is a random 192kHz FLAC I
> found
> online. The orig-48k.png is the downsampled version of that file, since all
> of
> the AAC outputs are downsampled to 48k as well.
>
> https://github.com/TimothyGu/picture-storage/issues/1
>
> To my untrained eyes, the FDK output is a lot closer to the original.

You could really pick any lossless flac file for more useful
comparison, with mandatory log scaler.

With the random flac file I picked, I can clearly notice black gaps, frequencies
completely gone with native aac encoder. I havent tested other encoders though.