FLAC: the high-def MP3 explained

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Ty is a journalist with 15 years experience in writing for IT and entertainment publications. He is in charge of the home theatre category for CNET Australia and is also a PC enthusiast. He likes indie music and plays several instruments. Twitter: @tpendlebury

In the late 1990s, one of the original portable music file formats — the MP3 — was causing quite a bit of bother. It had earned itself a reputation as a pirate format, which was mainly due to the site Napster, which was at the height of its popularity. While MP3s inevitably prevailed, there is a much better choice for high-quality music, and it's gaining in popularity.

FLAC is a music format that offers true CD quality, and is playable on everything from Sonos to iOS.
(Credit: Sarah Tew/CNET)

Free Lossless Audio Codec (FLAC) is a music file format that offers bit-perfect copies of CDs at half the size, and is compatible with many phones (including the iPhone — with an app), MP3 players and hi-fi components. It's available for the same price as the equivalent MP3 in online stores, and it sounds much better.

To see where FLAC has come from and where it could be going, you only need to look at the history of its "lossy" predecessor, the MP3. Although MP3.com was one of the first sites to sell MP3s in 1999, dedicated MP3 players like the Rio PMP300 were subject to legal action by record companies. Yet, when the iPod was released in 2001, it helped legitimise the format, and today MP3s are now sold by most online music stores.

FLAC, ahh-ahhh, it'll save every one of us*

*Apologies to Queen.

Until now, the music format FLAC has enjoyed a similar "pirates-only" reputation due to its lack of DRM, but it has the potential to reach a larger audience than simply audiophiles and tech enthusiasts. Currently, record labels like Merge and Warner are on-board with the format, and consumers can buy music from acts such as M Ward and the Grammy award-winning Arcade Fire — for the same price as the iTunes store.

FLAC first emerged in 2001 as an open-source alternative to other lossless formats emerging at the time. These included Apple Lossless (ALAC), Microsoft's WAV (Waveform Audio Format) and WMA Lossless. But these competitive formats do have their disadvantages. While ALAC has a loyal following amongst iPod and iPhone users, it hasn't seen much uptake by brands outside of Apple. The WAV format is more popular, and it's also compatible with iOS devices, but its biggest problems are that file sizes are very large, and it can't retain "tag" data — artist, album name, lyrics, etc — in the way that the other formats can.

Media Monkey, pictured with the MonkeyFlow plug-in, is a FLAC player and ripper for PC.
(Credit: Screenshot by Ty Pendlebury/CNET)

What's the difference between MP3 and FLAC?

MP3 is a lossy format, which means that parts of the music are shaved off to get the file size down. It is supposed to use "psychoacoustics" to delete overlapping sounds, but it isn't always successful. Typically cymbals, reverb and guitars are the sounds most affected by MP3 compression, and they can sound really distorted or "crunchy" when poorly ripped or overly compressed.

Like MP3 before it, FLAC is starting to be embraced by the music industry as a cost-effective way to distribute CD-quality music, and it doesn't have the auditory problems of MP3s. FLAC is lossless and more like a ZIP file; theoretically, it comes out sounding the same when it is unzipped. In hi-fi terms, MP3 is to Sony's MiniDisc format what FLAC is to CD. And who uses MiniDisc anymore?

The advantage of FLAC files versus the CD format CDA or WAV is that they use much less space — typically around half the space. Of course, FLAC still uses up to six times the space of MP3s, but the advantage to this is that more information is retained, leading to an audible boost in quality. Furthermore, FLAC is not just restricted to CD quality, and you can buy files of up to 24-bit/192kHz for another potential boost in performance.

While Neil Young's mysterious Pono format has yet to materialise, some experts have said before that high-quality digital downloads are unlikely to get any better than what FLAC currently offers.

A post on Bowers & Wilkins' Society of Sound blog cited Malcolm Hawksford, professor of psychoacoustics at Essex University: "FLAC has a place in the future for high-quality audio. It is good for transporting files on the internet, as it typically halves download time. It is unlikely that for lossless compression, there will be significant improvements."

How do I play FLAC files?


FLAC Player is one of the many apps for iOS that enables FLAC playback.
(Credit: FLAC Player)

There is arguably one hurdle preventing FLAC's full-scale adoption: the Apple iPhone and other iOS devices don't support the format natively. With every major edition of iOS and iTunes, we secretly hope for FLAC support, but we could be waiting for a very long time. In the meantime, there are now several apps available in the iTunes Store that do support the format and even let you stream them via AirPlay and DLNA between devices on your network. MediaConnect, available from the App Store, has the most functionality and file support, but it can be a little daunting for beginners. There are several other apps, including FLAC Player and Capriccio.


Android users don't need to worry as much about FLAC support; from Android 3.1 (Honeycomb) onward, the OS supports it natively. Even if you have an older version, manufacturers like HTC and Samsung have added FLAC support to their media players. Nonetheless, good apps to try from Google Play are Player Pro and Bubble UPnP (which also includes DLNA support).

Windows and Mac

If you're a Windows user, you can play FLAC files via a Windows Media Player plug-in, but the two native players most recommended by audiophiles are Media Monkey and JRiver. Meanwhile, Mac users can download Fluke, which includes basic support for FLAC in iTunes or Songbird (also on PC).


  • Portable: Android MP3 players have become quite common — from Samsung's Galaxy Players to Sony's NWZ-Z1040 — and these support FLAC natively. Most of Creative's Zen players also support FLAC

  • Hi-fi: of course, the biggest advantage to FLAC files is that they are ideally suited to listening to on hi-fi. Panasonic's highly regarded DMP-BDT220 Blu-ray player supports FLAC, as does the multi-room Sonos system. Sadly, although the Logitech Squeezebox has FLAC playback, it has been discontinued. The replacement "Smart Radio" does support FLAC, though.

  • The future of FLAC

    While physical discs are still popular, their usefulness will eventually be eclipsed by the convenience of purely digital files. The lack of DRM in FLAC means you can make as many copies of the file for your personal use that you want, and you don't have to worry about the physical discs degrading; yes, disk rot is real. While FLAC will probably never be as popular a format as CD and DVD were in their heyday, it's likely to be the format of choice for people who care about sound quality.

    But it does have one potential competitor: streaming. While Pandora and Rhapsody have existed for years, the low bit rate of their catalogues — 192 kbps and 128kbps (!), respectively — has meant that they're no match for FLAC in the audio department. There is one streaming service that offers very high sound quality: Spotify. All of its music is ripped in 320kbps Ogg Vorbis. Yes, it's still lossy, but if you want the next best thing to true CD quality, this is it. Spotify lets you download tracks for offline listening, and the catalogue is quite impressive — and it's only US$10 per month for the unlimited plan.

    Meanwhile, Apple recently announced its Mastered for iTunes program, which offers the promise of 24-bit/44.1kHz downloads at some point in the future. Maybe. Interestingly, Apple was one of the last proponents of DRM, but it started phasing it out in 2007 with iTunes Plus.

    It's not difficult to imagine that sometime very soon, Spotify, Neil Young or someone else will offer lossless files for streaming over the net, and when this happens, the need for FLAC could diminish. But, of course, you'd still need to pony up for a subscription fee for the rest of your life or lose access to those files.

    Though streaming services may come and go, and the long-term prospects of Spotify are not assured, a FLAC file is like a CD: once you buy or rip it, it's yours forever (barring storage catastrophes). FLAC may never actually supplant MP3, but if you care about sound quality, then FLAC is undoubtedly your best option — both now and into the foreseeable future.

    Via CNET.com

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Chandler posted a comment   

What about VLC? Doesn't it support FLAC?


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