Interesting. I looked at these encodings with our analysis tool and the thing that stands out in comparing the Q0 to Q9 encodings is that the Q9 does no amplifications at all (scalefactors all zero). The ProTools encoding also does less amplification (no scalefac_scale use) and manages the bit reservoir better.
This is probably academic to you unless you are an encoder developer! One thing you could try is downsampling to 22.050. For voice recording that should be plenty of bandwidth and it will let the encoder use the bits more efficiently. Cheers, -Bill > From: Stevo Brock <[EMAIL PROTECTED]> > Reply-To: MP3 encoders development list <mp3encoder@minnie.tuhs.org> > Date: Fri, 19 Oct 2007 12:35:25 -0700 > To: MP3 encoders development list <mp3encoder@minnie.tuhs.org> > Subject: [mp3encoder] 44.1kHz, 64Kbps, CBR mono encoding question > > Hi list, > > 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. > > Interestingly, as quality setting is increased, the output actually > gets worse. > > We don't know anything about the advanced acoustic settings. Would > that help our situation? > > Sample files are: > -original WAVE: http://monkey-tools.com/downloads/01_11a.wav > -encoded at lowest quality: http://monkey-tools.com/downloads/01_11a% > 20Q9.mp3 > -encoded at highest quality: http://monkey-tools.com/downloads/01_11a% > 20Q0.mp3 > -ProTools encoded: http://monkey-tools.com/downloads/01_11a_Protools.mp3 > > Any help or suggestions would be greatly appreciated. > > -Stevo Brock > Head of Development > Monkey Tools > www.monkey-tools.com > > > > > _______________________________________________ > 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
