On 2014-09-02 10:16, David Henningsson wrote: > > > On 2014-08-24 20:53, Alexander E. Patrakov wrote: >> I have finished the first stage of my work on resampler quality >> evaluation. >> >> The scripts are here: https://gitorious.org/psy-eval/psy-eval/ >> The results are here: https://imgur.com/a/jtIEj >> >> Note: they are valid only for 44100 -> 48000 Hz resampling. But that's >> the common case. >> >> TL;DR summary: it makes sense to change the default resampler quality >> from the current "speex-float-1" value to "speex-float-3" or even >> "speex-float-5" on capable machines, otherwise the distortion is >> sometimes noticeable. And, speex-float-{3,5} are similar to what >> proprietary OSes offer. > > Hi, > > Indeed interesting work, but I have a few concerns to that conclusion... One thing I forgot to ask about - the quality vs the CPU power taken by the different resamplers is a critical measurement here. E g, if soxr-lq would be as quick as speex-float-1 there's nothing stopping us from switching to soxr-lq by default, which by your diagram performs better than speex-float-1. So to find the best quality vs performance here, I think we need to understand how well the different resamplers perform too. -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic
