Hi Jaroslav, You mentioned the mode parameter tuning of LAME. That's something I know very little about. Is there any overview advice you can give about that?
-Stevo Brock Head of Development Monkey Tools www.monkey-tools.com On Oct 19, 2007, at 1:57 PM, Jaroslav Lukesh wrote: > ----- Original Message ----- > From: "Stevo Brock" <[EMAIL PROTECTED]> >> We are trying to use LAME to encode a WAVE file to a 44.1kHz, 64Kbps, >> CBR mono mp3 file and are having trouble matching the quality of the >> same file produced by ProTools. >> >> Currently we are using the following settings: >> Source file 44.1kHz >> 64Kbps >> CBR >> Stereo Mode Mono >> Quality: 9 >> >> which gets us pretty close, but there are still some slight audible >> artifacts. The ProTools file has no audible artifacts at all. >> > > Lame is no good encoder for bitrates <160 kbps CBR or <130 kbps ABR. > Fastencc (as reference highest possible quality encoder) which is > part of > protools (if you mean ten-thousands$$$ musical HW&SW of course), is > the best > for low bitrates as inet audio streaming etc. > > Lame needs mode parameters tuning, as move ATH, different ATH > curves etc. > And of course, fastencc does not use MDCT at highest quality mode, but > different algorithm, which gave not only spectral waves, but it > relys on > phase shifts too. > > Now I hear all audio academics with long titles before and after their > names, that ear does not recognize phase shifts... Yes, of course, > ear does > not recognize phaseshifts at sinusoidal signal, persist from > bigbang to > collapse of universe. But music is DYNAMIC with transients and here > ear > should hear tones which is in some cases more than 30 dB under > popular audio > "0dB" curves. And transients without original phase shifts are not > right > formed transients, but something totally different. ANd there your > ear and > brain does not recognize tones as with original signal. > > You should make some tests for that: you should need very good audio > equipment (good <> astronomical price!), rather studio grade with > even worse > parameters than Hi-End with 0,000000001% sinusoidal distortion. Now > you can > listen for example R&B with deep plucked bass sounds at levels > about 30dB. > Yeah, you should hear these deep bass sounds! So public theory > about ATH > curves lies for that. > > Studio grade equipments are constructed for transient signal which > does not > have easy to measurable parameters, if any. But it have maximum sound > reality. Noise and sinusoidal distortion are not the main > parameter. Hi-End > grade audio are constructed to reproduce sinusoidal signals which > have nice > easy to measure parameters, but it doesnot reproduce natural sound > as is. > > If you want high quality, use studio equipment and does not look at > their > technical parameters. Total output S/N of mixer like 80dB, THD > about 0,01% > is normal... Yes, but it sounds BETTER than any Hi-End. > > Regards, JL. > > > > _______________________________________________ > mp3encoder mailing list > mp3encoder@minnie.tuhs.org > https://minnie.tuhs.org/mailman/listinfo/mp3encoder > _______________________________________________ mp3encoder mailing list mp3encoder@minnie.tuhs.org https://minnie.tuhs.org/mailman/listinfo/mp3encoder
