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Music, Audio, and Podcasting Do you use your Mac to create music? This is the place for discussions on creating and editing music on the Mac!

Rips to iMac


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Seacliffe301

 
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I am about to resume ripping my CD collection to my iMac now that I've gotten a larger drive to work with. Of late, I've been reading much about XLD and it's merits, so I think I'm going to try that. As for formats, I've read that Apple Lossless, and wav files actually alter the sound in some cases in relation to the originals. At least to some peoples ears.
I want transparency. I am considering AIFF. My existing iTunes library seems to be a mixture of AAC, MP3 & wav.

Would someone please explain the basic differences between AAC, AIFF, & MP3 as it relates to compression, files size, transparency, sonic quality, etc.
I want to maintain quality, as well as maintain compatibility with an iPod. Thanks.
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RadDave

 
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Quote:
Originally Posted by Seacliffe301 View Post
I am about to resume ripping my CD collection to my iMac now that I've gotten a larger drive to work with. Of late, I've been reading much about XLD and it's merits, so I think I'm going to try that. As for formats, I've read that Apple Lossless, and wav files actually alter the sound in some cases in relation to the originals. At least to some peoples ears.
I want transparency. I am considering AIFF. My existing iTunes library seems to be a mixture of AAC, MP3 & wav.

Would someone please explain the basic differences between AAC, AIFF, & MP3 as it relates to compression, files size, transparency, sonic quality, etc.
I want to maintain quality, as well as maintain compatibility with an iPod. Thanks.
Hi Seacliffe... - ya know all of this can be easily 'googled' by yourself, BUT I'll just put together my thoughts quickly (seen in the quoted listing below), and also make some general comments - for more specifics, just do some web searching.

There are two general categories of audio codecs: 1) Lossless; and 2) Lossy - Lossless codecs duplicate the CD audio data exactly - WAV is simply a way of putting your CD music onto a HD (or elsewhere) as an exact copy, BUT the size is the same as on a CD (about 10 MB/min); AIFF is Apple WAV so like CD-A (CD Audio), i.e. LARGE files; NOW, FLAC is probably the most popular lossless and compressed choice around - free open source, however, not all software and/or hardware will support playback; FLAC is a great choice to rip your music w/ no loss of information but a smaller file size; of course, the FLAC files can be converted to lossy formats, such as MP3 to put on portable devices (my iPod Touch has all MP3 files).

Lossy audio formats drastically reduce file size, so ideal for small portable players; however, the quality of the sound is also affected and can be regulated by bit rates chosen - for myself I rip CDs to MP3 using bit rates of 192 or 256 kbps - at these rates the music quality is similar to CDs (of course, many would argue one way or the other). MP3 (MPEG Layer 3) is more popular, used by many online music DL sites, and compatible w/ many portable players. AAC is Apple's equivalent to MP3 and is more efficient. WMA is a less used choice.

NOW, if I were ripping my CD collection (don't want to because it is over 4K @ the moment), I would likely do FLAC for archived lossless storage, and then use a converter program to MP3 files as needed - these can be put onto portable devices or 6-8 hrs. of music put onto a CD-R.

Hope this helps - Dave

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Audio Codecs

Lossless: non-compressed (NC) & compressed (C)
WAV (Windows NC) - duplicates CD-A - LARGE files (10 MB/min)
AIFF (Audio Interchange File Format) - Apple’s WAV version
FLAC (Free Lostless Audio Codec) - C file & saves space

Lossy: information lost but to a variable extent
MP3 - popular; bit rate affects quality; 1MB/min average
AAC (Advanced Audio Codec) - Apple’s MP3 equivalent; better?
WMA (Windows Media Audio) - similar to the others
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Seacliffe301

 
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Thanks, Dave. Just the type of overview I was looking for.
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Seacliffe301

 
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Using the AAC format, is there any harm in choosing a mandatory rate of 320 kbps for all rips?
The thought being, using the highest bit rate possible for this lossy format.
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RadDave

 
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Quote:
Originally Posted by Seacliffe301 View Post
Using the AAC format, is there any harm in choosing a mandatory rate of 320 kbps for all rips?
The thought being, using the highest bit rate possible for this lossy format.
Hi again - I usually rip at 256 Kbps from my CDs as MP3 files; AAC will produce similar results (look HERE for some comparative hearings @ different bit rates). Keep in mind these are not for 'archival' purposes - as already stated, the CD serves that purpose or if one indeeds wants ALL of their collection on a media server, then a lossless codec, such as FLAC, is appropriate. And remember, the higher the bit rate, the better the quality, BUT at the expense of increased file size, so your storage capacity becomes a consideration, especially if dealing w/ a LOT of music.

Now using high bit rate MP3 or AAC likely makes little difference, particularly if your goal is to put the music on a portable player - however, such players are more compatible w/ the MP3 format (e.g. my DVD & BD players & my basement boom box only can read MP3 CD-Rs), so check your current electronic devices because the AAC format may not be playable. Dave
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Seacliffe301

 
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Thanks again Dave for the info.
Just to clarify, I like you maintain a CD (and vinyl) library for archival & critical listening purposes. The purpose of my file based library is for the convenience of a portable listening source when away from home. In my case I use an iPod. Regardless, I still wanted to maintain the highest quality with out resorting to lossless formats. I've noticed that anything that I've purchased from iTunes has been at 256kb. In the case of ripping CD's, I chose 320kbps in hopes of "not leaving anything on the table", or inducing any noticeable compression artifacts. Nothing scientific or proven.
If this is a waste of hard drive space, I'm open for any comments. Thanks
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RadDave

 
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Quote:
Originally Posted by Seacliffe301 View Post
Thanks again Dave for the info.
Just to clarify, I like you maintain a CD (and vinyl) library for archival & critical listening purposes. The purpose of my file based library is for the convenience of a portable listening source when away from home. In my case I use an iPod. Regardless, I still wanted to maintain the highest quality with out resorting to lossless formats. I've noticed that anything that I've purchased from iTunes has been at 256kb. In the case of ripping CD's, I chose 320kbps in hopes of "not leaving anything on the table", or inducing any noticeable compression artifacts. Nothing scientific or proven.
If this is a waste of hard drive space, I'm open for any comments. Thanks
Hello again - well, from recent posts, you'll need to make a decision between MP3 & AAC; again I feel that the main factor is what your equipment can playback to you? Both codecs at the higher bit rates, e.g. 256 Kbps are going to sound similar when used on equipment that is NOT that hi-fidelity; ACC is better if going to lower bit rates - see the quote below from HERE which emphasizes that you don't need a large investment when listening to 'lossy' music.

For myself, CDs are my archival format, and I've chosen the MP3 codec mainly for compatibility w/ the players I own - my main uses are: 1) an older iPod Touch (2G) w/ about 90 hrs of music - I use this device w/ either inexpensive BT headphones or BT little speakers on the road; or 2) MP3 files burned to a CD-R for hours of music in my basement shop on a boom box - high quality is not an issue. SO, you need to define your uses & goals - MP3 @ 256 Kbps works for me w/ those purposes. ACC at similar bit rates would be fine also, especially on my iPod but not as burned CD-Rs - bottom line is that you have plenty of information by now to make your decision(s) - first, use the higher bit rates, such as 256 (you could go a notch lower but probably little need to go higher) and then decide on your codec based on the hardware you currently own or are anticipating to buy - about all that I can offer - good luck and let us know your results. Dave


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What does all this mean?
Basically, if you want true CD quality from the files on your iPod or music server, you must use WAV or AIF encoding or FLAC, ALC, or WMA Lossless. Both MP3 and AAC introduce fairly large changes in the measured spectra, even at the highest rate of 320kbps. There seems little point in spending large sums of money on superbly specified audio equipment if you are going to play sonically compromised, lossy-compressed music on it.

It is true that there are better-performing MP3 codecs than the basic Fraunhöfer—many audiophiles recommend the LAME encoder—but the AAC codec used by iTunes has better resolution than MP3 at the same bit rate (if a little noisier at the top of the audioband). If you want the maximum number of files on your iPod, therefore, you take less of a quality hit if you use AAC encoding than if you use MP3. But "CD quality"? Yeah, right!
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