4 ms·
> See the multiple charts at http://opus-codec.org/comparison/ http://opus-codec.org/comparison/, for one presumably-unbiased source. Further nitpick: the page
by pizza234 9y ago
> See the multiple charts at http://opus-codec.org/comparison/ http://opus-codec.org/comparison/, for one presumably-unbiased source.
Further nitpick: the page is very misleading. Audio compression has different targets, a crucial one being music.
The Opus official page has comparatively little test references for music, both of which are at 64/96kbps for AAC [1-4], which is significantly below the general audience listening standards (160+ kpbs).
This implies that the red line on the top right of the first diagram is literally made up.
Until further blind listening tests are performed, generic conclusions such as "Opus outpeforms the competition" are unfounded.
> It attempts to summarize results [...] and (when no data exists) show anecdotal evidence
This is borderline offensive for people who are serious about researching music quality. Any anectodal evidence [in this field] is garbage.
[1] http://listening-tests.hydrogenaud.io/igorc/results.html http://listening-tests.hydrogenaud.io/igorc/results.html
[2] https://people.xiph.org/~greg/opus/ha2011/ https://people.xiph.org/~greg/opus/ha2011/
[3] http://listening-test.coresv.net/results.htm http://listening-test.coresv.net/results.htm
[4] http://opus-codec.org/static/comparison/GoogleTest1.pdf http://opus-codec.org/static/comparison/GoogleTest1.pdf
- jmvalin 9y agoThere's a good reason all the listening tests have stopped at 96 kb/s. Above that, the quality of Opus, Vorbis and AAC is so close to transparency that it's pretty much impossible to get statistically significant results. Even the latest 96 kb/s test was really stretching things.