Re: [Audacity-devel] [Audacity-quality] Fwd: Re: Fw: SoX resampling
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From: Vaughan J. <va...@au...> - 2012-11-26 00:14:59
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On 11/25/2012 12:37 AM, Gale Andrews wrote: > > | From Vaughan Johnson <va...@au...> > | Fri, 23 Nov 2012 18:47:25 -0800 >> On 11/23/2012 12:25 PM, Gale Andrews wrote: >>> >>> | From Rob Sykes <aq...@ya...> >>> | Fri, 23 Nov 2012 19:41:11 +0000 (GMT) >>> [...] >>>>> Same with pulse or the hw device. Even a 90-110% range does it. >>>>> Anyone else see that with libsamplerate, or is the slow machine >>>>> the problem? >>>>> >>>>> I get complete playback of Time Tracks if I use libresample on that >>>>> netbook. >>>> >>>> I'm sure using libsamplerate must be the problem here -- with higher settings, it's known to be too slow for real-time use on most hardware. >>> >>> Can Vaughan confirm that for real-time, we are using the fastest >>> setting for the var-rate resampler? >> >> I think I did so, in responding to Rob's other question about this >> elided stuff: >> >> >>>> Isn't the "High-Quality" (as opposed to >>>> "Real-time") >>>> setting for the var-rate resampler already fixed at the best choice? >>>> So for libresample (as in the above case) I thought it was already >>>> set to "High-quality sinc interpolation"? >>> >>> >>> I'm not sure what was decided in the end. Vaughan, apologies for not paying attention—can you comment on this one? >>> >> >> Right? Time Tracks apply only to playback, and that's been hard-coded to >> fast method since 2003 -- no change in this integration of libsoxr. > > OK, thanks for confirming the playback is "fast" quality; it's clear > then the netbook will be too slow to play Time Tracks using > libsamplerate. I have no problem playing Time Tracks using > libsamplerate on the faster laptop. I see that libsamplerate's fast quality also takes longer to do the resample than libresample's fast, even on a segment of just a few (warped) seconds. > > The netbook takes 11 times longer to render a time track when > libsamplerate is enabled as when libresample is enabled, so I > assume that is confirmation the render is using the var-rate > resampler (at the best quality available). Yes, for render it always uses best quality, for either libresample or libsamplerate. - Vaughan |