On Tue, Sep 12, 2000 at 12:25:46PM +0200, Gabriel Bouvigne wrote:
>
> In both cases I think ( I didn't really calculate) the size increase should
> be something around 5%.
>
Wrong. For the slight increase ca. 0.1%, for the more harder ca. 1%.
> Yes, it's tolerable, but I personnaly don't think
> that this would increase the overall quality by 5%, So I personnaly don't
> use any minimum bitrate.
>
There is something wrong in the low level range.
I have two tools:
mp3_loud: You can increase the loudness of a MP3 by multiples of 1.5 dB
resample: You can generate HQ low level WAV files (side effect).
Example:
$ resample input.wav 44100.0 input-60dB.wav 0.001
$ lame input-60dB.wav output-60dB.mp3
$ mp3_loud 32 < output-60dB.mp3 > output-60dB+48dB.mp3
Listen to output-60dB+48dB.mp3
CBR are okay, VBR not.
Both programs (pre alpha hacks) are 23 Kbyte large.
> (but for classical music I use --noath).
> But I don't get your point about what you're trying to explain with those
> examples.
>
That I haven't tested. What makes this options? Aha!
Another test suite. I need a computer farm for all test suites.
And a bundle of children for the hearing tests ;-)
Should we enable --noath for -V1 and -V0 on standard ?
> > FhG forces 48 kHz on 320 kbps. Maybe to bring the bits/granule ratio to the
> > right place.
>
> But in VBR mixed sampling rates are fordidden.
>
Also in CBR.
But FhG don't mixes sampling rates, but it forces 48 kHz on 320 kbps.
I don't understand this until the word <4096 bit/granule feld.
$ mp3encdemo31 -v -qual 9 -br 256000 -if Maire.wav -of Maire_FhG_256.mp3
********* MPEG Layer-3 Encoder V3.1 Demo (build Sep 23 1998) *************
(C) 1998 by Fraunhofer IIS-A
This program is protected by copyright law and international treaties.
Any reproduction or distribution of this program, or any portion
of it, may result in severe civil and criminal penalties, and will be
prosecuted to the maximum extent possible under law.
For further info, please visit http://www.iis.fhg.de/audio/
this program is limited to encoding 30 seconds of audio data.
in: 44100 Hz, 2 channel(s), 16 bit/sample
out: 44100 Hz, 2 channel(s), 256000 bit/s
full huffman search ON
88.1 seconds running time
encoding finished.
$ mp3encdemo31 -v -qual 9 -br 320000 -if Maire.wav -of Maire_FhG_320.mp3
********* MPEG Layer-3 Encoder V3.1 Demo (build Sep 23 1998) *************
(C) 1998 by Fraunhofer IIS-A
This program is protected by copyright law and international treaties.
Any reproduction or distribution of this program, or any portion
of it, may result in severe civil and criminal penalties, and will be
prosecuted to the maximum extent possible under law.
For further info, please visit http://www.iis.fhg.de/audio/
this program is limited to encoding 30 seconds of audio data.
in: 44100 Hz, 2 channel(s), 16 bit/sample
out: 48000 Hz, 2 channel(s), 320000 bit/s
full huffman search ON
73.8 seconds running time
encoding finished.
$ _
This feature is enabled for -qual=7...9 and without any quality selector.
--
Frank Klemm
--
MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
