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FLAC vs Apple Lossless file sizes

I've been looking into moving up to lossless audio files. From what I've been able to discover, FLAC and Apple Lossless should be roughly the same file size, but I downloaded a 24-bit/44.1kHz FLAC from the Bowers & Wilkins site (about half-way down the page - search for Portico) which is 35MB. I transcoded it to Apple Lossless using Max and the resulting file is 62MB - 77% larger!!


Does this seem right? Is the compression level variable for FLAC and/or Apple Lossless (as there is for ZIP for example)? There's no such option in Max.

MacBook Pro with Retina display, OS X Mountain Lion, 2.6GHz/16GB/512GB

Posted on Oct 16, 2012 10:05 AM

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Oct 16, 2012 10:52 AM in response to parish_chap

I know FLAC has settings. Don't know about ALE but frankly I have no room for lossless in my iTunes library so I just archive with FLAC.


http://wiki.hydrogenaudio.org/index.php?title=Lossless_comparison - ALE and FLAC are about the same %


Which settings are you using in Max? I have version 0.9.1 and don't see Apple Lossless. I see it in XLD.

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Oct 16, 2012 2:21 PM in response to parish_chap

Took a 207.2 MB AIFF file (classical music).


Converted using XLD.


FLAC 100.4 MB

ALAC 103.6 MB


Check your settings carefully. Is it possible you are sampling at a higher resolution (48k) than the original? What you are seeing is not consistent with other observed behaviors.


Check your files with:


Media Info - http://mediainfo.sourceforge.net - to get details of codecs used in multimedia

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Oct 16, 2012 2:49 PM in response to Limnos

Hmm, interesting. MediaInfo reports the following:


Apple Lossless:



Audio

ID : 1

Format : ALAC

Codec ID : alac

Codec ID/Info : Apple Lossless Audio Codec

Duration : 5mn 34s

Duration_LastFrame : -49ms

Bit rate mode : Variable

Bit rate : 1 484 Kbps

Channel(s) : 2 channels

Sampling rate : 44.1 KHz

Bit depth : 24 bits

Stream size : 59.1 MiB (100%)

Language : English

Encoded date : UTC 2037-05-12 23:52:44

Tagged date : UTC 2037-05-12 23:52:44


FLAC


Audio

Format : FLAC

Format/Info : Free Lossless Audio Codec

Duration : 5mn 34s

Bit rate mode : Variable

Bit rate : 840 Kbps

Channel(s) : 2 channels

Sampling rate : 44.1 KHz

Bit depth : 24 bits

Stream size : 33.4 MiB (100%)

Writing library : libFLAC 1.2.1 (UTC 2007-09-17)


So, same bit depth and sampling rate, but the bit-rate for the Apple Lossless is much higher than the FLAC.


In XLD I have "same as original" for bit-rate and sample frequency.


I've found some more free FLAC download samples at NaimLabel (panel on the right about half way down) and when I transcode these to Apple Lossless the files are the same size as the FLACs, give or take, so I guess these aren't as compressed?

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Oct 16, 2012 3:32 PM in response to parish_chap

Have to make supper now, will write more later. Looks to me almsost as though your ALAC isn't compressed at all. Check a basic AIFF and bitrate isn't all that different from your ALAC. Maybe it isn't really compressing.


Were you using XLD? You said Max earlier.

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Oct 16, 2012 8:43 PM in response to parish_chap

Read


http://www.hydrogenaudio.org/forums/index.php?showtopic=69879


This seems to be something to do with the technical details of 24bit sound and ALAC. I converted that 35MB Portico sound file to 86MB AIFF with XLD, then back to both FLAC and ALAC. FLAC went back to around 33MB whereas ALAC ended up being 59MB or what it was when converted firectly from FLAC to ALAC. Anyway, the above links has a bit of technobabble on what may be going on, but as one person said, Apple might get around to fixing it when they see a need for it. Right now they don't sell anything in lossless or 24 bit so they may not perceive a need to support those features.


Joe: I believe Songbird also supports FLAC playback.

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Oct 26, 2012 6:23 PM in response to parish_chap

parish_chap wrote:


Thanks Linmos - so it appears to be a 24-bit issue. I'll try re-ripping a CD (so 16/44.1) at the weekend and see if the FLAC & ALAC file sizes are closer.

Finally got round to it.


Ripped a CD in iTunes as ALAC, exported it, converted to FLAC using XLD with the default settings and the two were more or less the same size - ALAC 36.6MB, FLAC 35.9MB - so it appears to be a 24-bit issue with ALAC

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Jul 15, 2013 11:15 AM in response to parish_chap

I have an ipod, but i download all my music in flac format. I convert my tracks to .wav. Since iTunes lets you tag all file formats (within the apple ecosystem), this is very ideal. My average FLAC track is about 40 MB, and after conversion and tagging, it is about 43 MB, so there is minimal growth in file size, but tagging and lossless quality remain. I suggest trying this method.

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Jul 15, 2013 11:30 AM in response to tarfeef101

tarfeef101 wrote:


I have an ipod, but i download all my music in flac format. I convert my tracks to .wav. Since iTunes lets you tag all file formats (within the apple ecosystem), this is very ideal

Not really. WAV do not have tags and if you move these outside of iTunes (or iDevice), the only info you get is the filename.

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Jul 16, 2013 9:48 AM in response to tarfeef101

tarfeef101 wrote:


hello, I did say within the apple ecosystem,

You mean the iTunes/iDevice ecosystem.

Use them in other applications on a Mac (part of the "Apple ecosystem") and they still won't have tags.

If they are AIFF/Apple Losssless, you will not have a problem with the files later, if you move them outside the iTunes/iDevice ecosystem.

I convert my tracks to .wav

and you convert them to WAV (instead of AIFF/AppleLossless) because?


Just trying to point out possible issues which may occur.

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FLAC vs Apple Lossless file sizes

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