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How To Use Mp3 Gain ?, 3 guides - normalization - maximizing
karenchu
post Jul 2 2011, 10:46
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sorry for bumping but still, can anyone show me the path to "Each Folder Is Album" option?
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Typhoon859
post Oct 6 2011, 07:56
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Whether it's with MP3Gain or by scanning first through something else, how can I apply Album Gain by tags (not folder) the way there is an option for in Foobar2000 for instance? Help would REALLY be appreciated. Thanks.
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Typhoon859
post Oct 6 2011, 09:00
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QUOTE (Typhoon859 @ Oct 6 2011, 01:56) *
Whether it's with MP3Gain or by scanning first through something else, how can I apply Album Gain by tags (not folder) the way there is an option for in Foobar2000 for instance? Help would REALLY be appreciated. Thanks.

Nevermind, I figured it out.

After using Foobar2000 to apply ReplayGain, I right-click all the selected MP3 files, go to "Tagging", "MP3 Tag Types", and select APE to be enabled. Then MP3Gain reads the data from there.
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Typhoon859
post Aug 1 2012, 21:44
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QUOTE (karenchu @ Jul 2 2011, 05:46) *
sorry for bumping but still, can anyone show me the path to "Each Folder Is Album" option?


That.

Does the newest version not have that function any more?
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thebearnecessiti...
post Dec 20 2012, 16:58
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brand new user, total noob.

I noticed a couple of my mp3's sounded too quiet, so i want to get them all sounding the same.

can i install mp3gain, set the option "dont clip", add the my music folder, and click on album gain?

and that's it? will that make all my mp3's sound more at the same volume level?

edit: for people asking about "each album is folder" option, i read further back in tyhis thread that that option is not longer in the software and it allows you to simply add your top level folder eg "my music" and each subfolder is treated like an individual album.

i did notice an "add subfolders" option so might be worth making sure that is ticked.

This post has been edited by thebearnecessities: Dec 20 2012, 17:01
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greynol
post Dec 20 2012, 17:58
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QUOTE (thebearnecessities @ Dec 20 2012, 07:58) *
I noticed a couple of my mp3's sounded too quiet, so i want to get them all sounding the same.

It really depends on what genre and its respective mastering, but in general loud tracks are adjusted downward. If it turns out that you listen to genres where tracks typically get adjusted upward, you may want to consider lowering the reference level. This is more likely to be the case if you listen to classical music and some forms of jazz where the reference level of 89dB doesn't provide enough headroom for dynamic parts.


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thebearnecessiti...
post Dec 20 2012, 18:49
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thanks geynol for taking the time to post.

I'm a bit confused by all this and cant get my head round it. is the principle that each mp3 has a vlume setting within it and the mp3gain software tries t make them all about the same?

I mostly have rock, pop, indie, blue in my collection of about 300 albums.

I just noticed that one of the bon jovi tracks was very quiet so i decided to put my entire collection through the software so stop me having to do it every time i notice a track is a bit quiet.

so now it seems that i am likely to find all my music is a bit quieter?

the software is just over halfway though but i think its still doing album analysis so maybe i should just cancel?

This post has been edited by thebearnecessities: Dec 20 2012, 18:50
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greynol
post Dec 20 2012, 19:18
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I'd let it finish. From what you've said I don't think you're going to run into any problems.

Since you've also instructed the program not to allow clipping you won't need to worry about your chosen reference level except that some albums might still be louder than quiet ones which were not made louder because doing so would result in clipping. The higher you set the reference level, the more likely this is to happen.

This post has been edited by greynol: Dec 20 2012, 19:21


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DVDdoug
post Dec 20 2012, 21:37
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QUOTE
so now it seems that i am likely to find all my music is a bit quieter?
Right! Much of your loud music (maybe most of your music) will be somewhat quieter... Hopefully, you can get enough volume from the analog-side of things.

Let's say you have a quiet song and a loud song. The quiet song might have a few peaks near 0dBFS* (basically the "digital maximum"), but these short-duration peaks don't make it sound loud.

Now, if you want to adjust the loud & quiet songs for the same loudness, you can't increase the quiet song without clipping/distortion. So, you have to decrease the loud-sounding song.

MP3gain isn't trying to match all of your files to each other (or you'd have to re-scan everything every time you added a song). It's trying to match a target dB level. A higher target gain will make your songs louder, but it doesn't give MP3gain much "room to work", and many of your tracks won't be changed unless you allow clipping.



* Just to keep things confusing... 0 dBFS uses is a different reference than the +89dB SPL used for MP3gain. But they are related, and for example a +3dB change in the digital file is also a +3dB increase in sound level (SPL), etc.
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greynol
post Dec 20 2012, 21:42
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QUOTE (DVDdoug @ Dec 20 2012, 12:37) *
A higher target gain will make your songs louder, but it doesn't give MP3gain much "room to work", and many of your tracks won't be changed unless you allow clipping.

I'm pretty sure they are still changed, but just up to the point before clipping will occur.


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user512Harry
post Mar 28 2014, 14:41
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New User here, but not totally out of it.
I am really not wanting to lose my marbles on this, but it seems that "Clipping" the music adds noise, or does it remove part of the sound at the clipping points in the song that gets clipped? If that is what happens, then wouldn't it be better to analyze the tracks, then normalize those tracks the do NOT get clipped at your chosen db level, not allowing those that get clipped to be normalized(sort out the non clipped) then reduce or raise the db and then only normalizing the songs that don't get clipped again?
Although that seems to be more work, I would rather have the songs closer to a steady volume that to have the music clipped or distorted. I hate music I love to be damaged by bad ripping or poor sound control.
Just asking for some information. I know this hasn't been looked at now in almost 2 years.
Harry
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lithopsian
post Mar 28 2014, 15:17
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Clipping simply truncates the volume at any point where it exceeds a digital threshold (you can think of it as 1, or 100%). That truncation distorts the sound so you can consider it as noise if you like. It isn't pleasant to hear in any case.

However, the amount of clipping that occurs could be anything from a single sample (a few microseconds) of sound to every drum beat. In the first case, you simply won't be able to detect it. The second case you will want to reduce the volume of the whole track to get rid of 99% of the clipping. Removing 100% of clipping is unnecessary, although in practice, removing 99% of it means removing 100% of it.

You could attempt to find a reference level that allows all your tracks to be played without clipping, then find a gain that brings all tracks to that level. The more common approach of picking a level, applying the gain, then adjusting clipping tracks afterwards is more common, but it does mean that those tracks that would have clipped are then played more quietly than the level you picked. However, given the preamp gains that could be applied before the music is tested for clipping, this is the only practical solution. If you want to go at it the other way, just bear in mind that it will all break if you apply a preamp. Also, adding a single new track to your ripped collection could break everything by exceeding the threshold you picked.

A practical solution in almost every case is to apply a gain to normalise all your tracks (or albums) and not to adjust for clipping. Usually it will be OK and you won't be able to detect anything audible from the tiny amount of clipping that occurs. Only if clipping becomes an audible issue will you need to go further. Simply allowing adjusting of clipped tracks may be sufficient to avoid the clipping without causing too much volume change. Only in extreme situations should you need to go further.
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Dewey
post Yesterday, 19:28
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Is it actually necessary to do this with modern digital audio tracks and newer iPods?

I ask because many years ago I had an MP3 disc player. I experienced lots of clipping so I used MP3gain to tune all my tracks down to 89db. But since then (well, like 10 years ago) I got an iPod classic (4th gen) and I have also ripped tracks from CDs or downloaded them from iTunes (etc) and it seems that when I convert them to MP3 the vast majority of tracks are >94db and MP3gain shows them in red (meaning they will be clipped). But are they really?

So all my MP3 tracks are <=89db and when I play through the Aux jack in my car I have to crank volume to max and still they are not very loud. The volume limit on my iPod is set at about 85% but I don't see that this would matter using the docking port instead of the earphone jack.

So, readers' digest version: is it really still advisable to reduce all MP3s to 89db to avoid clipping? Or can I just go with whatever db comes out of ripping tracks with iTunes?

Thanks,
Dewey


QUOTE (user @ Sep 1 2002, 12:38) *
MP3-CD album-based MP3Gain adjustment for newbies

written by Shadow RD
on: January 30, 2002, 03:44:40 PM

--------------------------------------------------------------------------------
I made this list up for myself (yeah I'm a bit lame!) and I thought it may lessen questions to Snelg and help others in the process if I posted it:

------------------------------------------------------------
How To Perform Optimised Album-based MP3 Gain Adjustment For Multiple Albums of MP3s for putting onto MP3-CDs
------------------------------------------------------------


(1) Put MP3 files in sub-folders sorted by album

(2) Open MP3 Gain, adjust:
Options\Each Folder Is Album (tick)
Options\Add Subfolders (tick)
Options\Show Path\File (tick)
Options\Advanced\Performance (tick both boxes)
Options\Advanced\Enable Maximising Features (tick)

(3) Set Target "Normal" Volume to 89 dB (if not already)
- Using 89 dB for the target volume will probably ensure
that no clipping will happen even for older albums
with greater dynamic range
- if clipping does occur with 89 dB you will have to reduce
the value

(4) File\Add Folder - choose folder containing all the album
subfolders

(5) Analysis\Album Analysis - does MP3 Gain Analysis album
by album

(6) Modify Gain\Album Gain - normalizes the MP3 Gain of all
albums relative to each other and as close as possible
to 89 dB

(7) Order files by Max Noclip Gain column (first do Radio
Analysis if Replay Gain information is not there
anymore) and note smallest value in the column

(8) Modify Gain\Apply Constant Gain - select value noted in
(7) to increase files gain by (if this is 0.0 then do
not adjust volume)

------------------------------------------------------------
This should ensure that the MP3s of each album are of comparable loudness and that the overall volume level is optimised.

------------------------------------------------------------

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DVDdoug
post Yesterday, 21:29
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QUOTE
I convert them to MP3 the vast majority of tracks are >94db and MP3gain shows them in red (meaning they will be clipped). But are they really?
Maybe... The MP3 itself may not be clipped. First, we need to switch our thinking from the acoustic domain where 0dBSPL is the threshold of human hearing and decibels are positive, to the digital domain where 0dBFS is the "digital Maximum" and decibels are mostly negative numbers (or zero).

The 89 or 94dB acoustic loudness reference isn't really calibrated since it depends on your volume control, and it's related to the average level and frequency content. Clipping is caused by the peaks which correlate very poorly with loudness.

You can have a quiet-sounding file with big peaks. If you try to boost that quiet-sounding file to match your louder music, it will clip. Since many of the quiet-sounding files can't be boosted (without clipping) the only way to match volumes is by reducing the loud files.

CDs, 16-bit and 24-bit WAV files, analog-to-digital converters (ADCs), and digital-to-analog converters (DACs) are all limited to 0dBFS. If you try to go over 0dB you'll get clipping.

Here's the tricky part... Mp3 is NOT limited to 0dB, so it can go over 0dB without clipping. But if you decode the MP3 and send the data directly to your DAC, your DAC will clip. I don't know if the iPod's volume is digital (before the DAC) or analog (after the DAC).

If it's a digital volume control, you can listen to an MP3 that goes over 0dB without clipping if you lower the volume. But, the amount you'd have to lower the volume is unknown because it depends on the peaks in the particular file (usually unknown), and the volume control isn't labeled in dB anyway.

QUOTE
So, readers' digest version: is it really still advisable to reduce all MP3s to 89db to avoid clipping?
Yes. you need to give MP3Gain "room to work" if you don't want clipping. I think by default MP3Gain is set to "Not Clip". If you try to to to 94dB without allowing clipping, MP3Gain won't do anything to maybe half of your files because they are already normalized (maximized) and they can't be increased at all without clipping.

QUOTE
Or can I just go with whatever db comes out of ripping tracks with iTunes?
Of course! But, you won't have the volume-matching you get with MP3Gain.

With iTunes and iPod, you can also use Sound Check, which is Apple's version of ReplayGain. (There are no settings/options for Sound Check and I don't know how the loudness of Sound Check compares with the 89dB default setting for ReplayGain/MP3Gain.)

QUOTE
(3) Set Target "Normal" Volume to 89 dB (if not already)
- Using 89 dB for the target volume will probably ensure
that no clipping will happen even for older albums
with greater dynamic range
- if clipping does occur with 89 dB you will have to reduce
the value
Like I said, with the default settings MP3Gain shouldn't clip. So, on a few albums/tracks where 89dB can't be reached without clipping, the target-volume won't be reached and these tracks will play quieter than 89dB. (There's no need to reduce the volume below 89dB unless you need to better-match ALL of your tracks, and then you'll have to change ALL of your tracks the the same volume below 89dB.)

This post has been edited by DVDdoug: Yesterday, 21:56
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