Newsgroup: it.comp.musica.mp3
Titolo: Qualità mp3

 Ciao a tutti
Premessa. sono un niubbio. Anzi di più....
Ho provato a lurkare e googlare ma la maggior parte dei testi è troppo
tecnica o richiede troppo tempo che sfortunatamente non ho.
Per cui mi domando se vi è qualche anima pia dipsosto a darmi quei 4
suggerimenti di cui ho bisogno supportando stoicamente la mia niubbiaggine e
domande a cui che probabilmente avete già dato risposta.
Prima di tutto: ho Ahead Nero e CDex
Vorrei duplicarmi in Mp3 i miei CD da ascoltare in auto (ho un lettore mp3
di ultima generazione della JVC) oltre a portare su CD alcune traccie
scaricare da internet.
Per passare da WAV a MP3 uso appunto CDex per poi burnare con Nero.
La cosa che non capisco è che spesso la qualità è talmente bassa da perdere
come delle traccie. Le voci di sottofondo oppure alcuni strumenti in auto
non so sentono mentre sul PC si.
Inoltre sui mp3 che scarico dalla rete, che masterizzo direttamente si
sentono strani scricchiolii e rumori ripetitivi.
Ho letto che viene consigliato il passaggio mp3 (da internet) > WAV > mp3.
CDex risolve il problema oppure dovrei usare EAC (che però essendo niubbio
mi creerebbe non poche difficoltà)?
Grazie infinite
Mister Sandman
--------------------------------
Inviato via 
http://arianna.libero.it/usenet/

 essendo niubbio mi creerebbe non poche difficoltà)?
EAC serve per un'estrazione garantita.. l'importante e' che tu usi gli alt
preset di lame.
-- 
Bye, jwolf

                    Il 07 Set 2004, 20:36, "jwolf" <jw...@invalid.invalid> ha scritto:
Navigando ho trovato questo passo-passo
http://eac.forgiven5.com/eacsetup.htm
Cosa ne dici? Posso ritenerlo valido?
Setting up Exact Audio Copy with LAME
1. Download eac095pb5.zip from the download page.
2. Download LAME v3.90.3
3. Extract eac095pb5.zip to a folder of your choosing. This EAC package does
not need to be installed.
4. Extract lame-3.90.3.zip to a folder of your choosing. LAME does not need
to be installed, but you need to remember the location you extracted to.
5. Run Exact Audio Copy by running the file EAC.EXE in the folder you
extracted eac095pb5.zip to.
6. EAC will make you do some drive tests so that EAC can determine the
features of your drive. It is possible that these tests will not execute
properly the first time you run EAC. They seem to complete immediately where
they should take 30-60 seconds. You should reboot the computer and then run
EAC again if you experience this.
NOTE: From this point forward, if no mention of a setting is made, leave the
setting at its default.
7. Open the "EAC" menu and select "EAC options..."
NOTE: For the following instructions, refer to Figure 1-1 below.
8. Click the tab that reads "Filename."
9. In the "Naming Scheme" box, type "%A - %N - %T (EAC 0.95pb5 LAME 3.90.3
-aps)." If you want the track number or album name in the filename, add the
appropriate tags.
a. "-aps" is my abbreviation for "--alt-preset standard." If you are not
using --alt-preset standard, then you should not use "-aps" anywhere. For
instance if you are using --alt-preset insane, you could instead use "-api."
If you are using a non --alt-preset then I suggest just listing the EAC and
LAME version numbers with no abbreviation.
10. Make sure the "Use various artist naming scheme" box is checked and type
"%N - %T (EAC 0.95pb5 LAME 3.90.3 -aps)" in the text box below it.
a. "-aps" is my abbreviation for "--alt-preset standard." If you are not
using --alt-preset standard, then you should not use "-aps" anywhere. For
instance if you are using --alt-preset insane, you could instead use "-api."
If you are using a non --alt-preset then I suggest just listing the EAC and
LAME version numbers with no abbreviation.
11. Click OK.
 
Figure 1-1: Your screen should look identical when you are finished.
12. Select "Drive options--" from the "EAC" menu.
NOTE: For the following set of instructions, refer to Figure 1-2 below.
13. Ensure the "Secure mode with following drive features (recommended)"
radio button is selected.
14. You do not need to detect the read features unless EAC did not
automatically attempt to test your drives when you first started it.
However, if the tests did not run properly initially and you rebooted, you
will have to press the "Detect Read Features--" button and follow the test's
instructions. You will have to do this once for each optical drive.
15. Press the "Examine C2 Feature--" if the drive tests detected that you do
in fact have a C2 error correction feature. If EAC did not detect a C2
feature on your drive you do not need to run this test.
16. The check boxes below the first radio button will be selected
automatically depending on your drive's features. Leave these boxes remain
however they are set after the drive tests.
a. An exception is the "Drive is capable of retrieving C2 error information"
check box. I choose to use EAC's built-in error detection and correction
since it is generally better, but you can use your drive's C2 correction if
you have it and you would rather use that. The checkbox for this feature
just tells EAC whether to use C2 or not, if your drive supports it. If EAC
detects that your drive does not support C2, do not check the box!
b. Not all drives have good C2 error checking, and not all drives have bad
C2 error checking. If you want to go through the trouble to find out how
good your drive's C2 checking is, follow the steps on this site. If your
drive does very well in these tests, go ahead and use your drive's C2
checking. If not just uncheck the box in EAC. Personally, I haven't bothered
with the test and just use EAC's error checking.
17. Click the "Drive" tab.
 
Figure 1-2: This screen will differ from mine if your drive has different
features. Ensure the first radio button is selected and the third checkbox
is unchecked.
NOTE: For the following set of instructions, refer to Figure 1-3 below.
18. Push the "Autodetect read command now" button. Most drives use Read
command MMC1, as mine does.
19. Just leave the "Drive read command" drop-down box at whatever comes up
after auto detecting.
20. Check the "Spin up drive before extraction" check box.
21. You may need to use the other two check boxes depending on your drive.
Most likely not, but it's a possibility. Testing is required here.
22. Click OK.
 
Figure 1-3: Your screen may differ. Select whatever options work for you,
but I highly recommend using the "Spin up drive before extraction" feature.
23. In the "EAC" menu, select "Compression options--"
NOTE: For the following set of instructions, refer to Figure 1-4 below.
24. Click the tab that reads "External Compression".
25. Ensure there is a check in the box next to "Use external program for
compression."
26. In the "Parameter Passing Scheme" drop-down menu, select "User Defined
Encoder." I am aware that there is a "LAME MP3 Encoder" selection, but trust
me. If you are determined to find out why you're not using the "LAME MP3
Encoder" selection, follow this link. Otherwise just trust me.
27. In the "Use file extension" box, type ".mp3."
28. In the "Program, including path, used for compression" box, enter the
path and filename where you extracted LAME, including the filename lame.exe.
(Alternately, you can browse for lame.exe and click OK). In my figure, I
have the location of lame.exe as it exists on my hard drive. Yours may
differ.
29. In the "Additional Command Line Options" box, type "--alt-preset
standard -c %s %d."
a. "--alt-preset standard" is a command-line switch that tells LAME to use
certain settings, such as a higher quality VBR mode, joint stereo, the
npsytune psychoacoustic model, and other quality settings. It will result in
an average bit rate from 180-230, generally. There are also "--alt preset
extreme" and "--alt preset insane" switches. Extreme provides a theoretical
boost in quality, though it of course uses a higher bit rate on average and
large majority of listeners cannot tell a difference between it and the
standard preset. Insane is 320kbps CBR and is the highest possible quality
currently available with LAME and MP3. It should be noted that it is not
possible to replicate all the functions of the --alt preset switches with
other, more conventional command-line switches, due to code-level tweaks
that the --alt-presets do. It should also be noted that all of the
--alt-presets use the nspsytune psychoacoustic model instead of the gpsycho
psychoacoustic model. Gpsycho is newer, but less work has been done on it
and it is currently inferior to nspsytune. Due to the --alt-presets using
the older nspsytune, Encspot 2.0 will report your MP3s as using the
"vbr-old" method. Do not worry about this because in this case, older is
better. Feel free to use another --alt-preset (I cannot recommend anything
else), but make sure you change anything that refers to "-aps" in this guide
to match whatever you are using.
b. The "-c" switch puts a little flag in the file that says it is
copyrighted. I am assuming you are ripping from copyrighted CDs, so you
should really use this switch. It does not hamper MP3 functionality at all
nor is it a form of DRM in any way. You will never notice this unless you
look at the file info in Winamp and see "Copyrighted: Yes," but it is just
the right thing to do.
c. The "%s %d" basically tells EAC to tell the encoder where the source file
is, what the filename is, where to put the encoded file, and what to call
it. All encoders require %s, or both %s %d (depends on the encoder) in the
command-line parameters if you are using EAC with the "User Defined Encoder"
setting.
30. The bit rate can be selected as anything in the "Bit rate" drop-down
menu, as the step #29 overrides this feature.
a. As stated, the selected bit rate in this box does not affect anything the
LAME encoder does with the command-line parameters we are using here.
However, it does affect the "Compr. size" displayed in EAC's main window.
This value shown is not a perfect representation of the expected file-size,
as VBR encodes are unpredictable and the value is calculated as if you're
using a CBR encode at whatever bit rate this box is set to. But as
--alt-preset standard MP3s are usually around 180-230kbps, 192kbps is a good
value to set this box to to get a (very) general idea about the expected
filesize of the resulting MP3s. This setting does not actually alter the
file at all.
31. Click the "High Quality" radio button.
32. Check the "Delete WAV after compression" box.
33. Uncheck the "Use CRC check" box.
34. Check the "Add ID3 Tag" box.
35. Click the "Offset" tab.
 
Figure 1-4: Your screen should look identical, except for the path of
lame.exe, which probably will differ.
NOTE: For the following set of instructions, refer to Figure 1-5 below.
36. Where it says "Construction of the ID3 Tag comment field on extraction,"
click the third radio button ("Write following text into ID3 Tag comment
field").
37. Type: "EAC 0.95pb5 / LAME 3.90.3 -aps" in the text box below.
a. "-aps" is my abbreviation for "--alt-preset standard." If you are not
using --alt-preset standard, then you should not use "-aps" anywhere. For
instance if you are using --alt-preset insane, you could instead use "-api."
If you are using a non --alt-preset then I suggest just listing the EAC and
LAME version numbers with no abbreviation.
38. Click the "ID3 Tag" tab.
 
Figure 1-5: Your screen should look similar, except for the offset
correction.
NOTE: For the following set of instructions, refer to Figure 1-6 below.
39. Ensure the "Additionally write ID3 V2 tags, using a padding of" box is
checked and the padding is 4kB. I do not recommend using ID3 V1.1 or
ID3V2.4.0 tags as they are not established standards.
a. I have heard that ID3v2 tags can cause problems of some kind. I
personally have never experienced any myself, but I feel it is my duty to
warn you. If you choose not to use ID3v2 that is perfectly fine. You will
only sacrifice the ability for more characters in the comment fields and the
ability of users downloading your MP3s to view ID3 information before the
file is complete, nothing more.
40. Type "%A - %N - %T" in the "Construction of filenames from ID3 tags"
text box.
41. Click OK.
 
Figure 1-6: Your screen should look similar.
42. In the "EAC" menu, select "freedb / Database options--"
NOTE: For the following instructions, refer to Figure 1-6 below.
43. Make sure you are on the "freedb" tab.
44. You can type in your email address or type in a fake one on the "Your
E-Mail address" line. It does not matter.
45. For "Freedb server," select any one. I use
http://freedb.freedb.org:80/~cddb/cddb.cgi
.
46. Click OK.
 
Figure 1-7: Your screen may differ.
You are now ready to rip CD tracks into high quality MP3s!
Ripping CD tracks into MP3 files via EAC and LAME
1. Open Exact Audio Copy.
2. Insert a CD.
3. When EAC displays the track numbers (Track 01, Track 02, Track 03, etc),
press Alt+G. This will connect you to the freedb server and obtain the CD
information and automatically insert it. This information will be used to
automatically name your MP3 files and to insert the CD information like
artist, track number, album name, and album release year into the MP3 file's
ID3 tag.
4. Check the genre listed in the drop-down box on the upper right. It is
common for albums in the freedb to be listed under the wrong genre. Change
the genre if necessary.
5. When EAC displays the correct names for your tracks, select the tracks
you want to rip and press Shift+F5.
6. Choose the location you want the final MP3 files to be placed and press
OK.
7. After the process has completed and EAC sounds a PC speaker beep, your
tracks have been ripped into high quality MP3s!
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Ciauz!
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