When it comes to the specific file mentioned from that page, the original
caption was also "Quality vs Bit-rate. - The figure below illustrates the
quality of various codecs as a function of the bit-rate. It attempts to
summarize results from a collection of listening tests and (when no data
exists) show anecdotal evidence. It is overall fairly representative, but
attempting to extract any exact value at a particular bitrate is certainly
not recommended." Plus it's from 2012, and likely isn't fully
representative of the Opus and alternative codec advancements since.
Emily B
On Tue, Mar 31, 2020 at 1:54 PM Orestes Zoupanos <
oresteszoupanos at hotmail.com> wrote:
> Paul,
>
> you may find the following page has more useful/accurate numbers than that
> diagram:
>
> https://wiki.xiph.org/Opus_Recommended_Settings
>
>
> ------------------------------
> *From:* opus <opus-bounces at xiph.org> on behalf of Paul Marks <
> pmarks at google.com>
> *Sent:* Thursday, February 13, 2020 6:31:39 PM
> *To:* opus at xiph.org <opus at xiph.org>
> *Subject:* [opus] opus-codec.org/comparison: Mono or Stereo?
>
> Looking at the Opus comparison page[1], I can't figure out whether the
> Opus/AAC/Vorbis/MP3 lines are meant to imply a mono or stereo
> encoding. Could someone please update the caption to clarify this?
>
> The single dot for G.711 is clearly mono, but for stereo music, are
> the codecs at the top meant to converge near 128 kbps, or 256 kbps?
>
> [1] http://opus-codec.org/comparison/
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