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What is FLAC? How to edit and play FLAC files?

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Since FLAC is supported by so many different programs, it can be a daunting task for the new user to choose a suitable program. This page will walk you through the steps. First, choose what environment you want to play FLAC files:

  • Windows
  • Mac OS X
  • Linux, *BSD, and other Unixes
  • Portable players, set-top boxes, car audio etc

Windows

If you want to play FLAC files, here is how with some popular players:

  • Windows Media Player (WMP) - install the Xiph’s OpenCodec plugins
  • Winamp - Winamp plays FLAC out of the box (download the Full version to also get FLAC encoding).
  • dbPowerAMP Audio Player
  • foobar2000 - A nice player that converts as well
  • (more)

If you want to edit the tags in FLAC files:

  • mp3tag - A free tag editor which supports editing tags, autotagging from online databases, cover art, and more.
  • Most players (like foobar2000 and Winamp) are able to edit FLAC-tags as well

Mac OS X

If you want to play FLAC files, here is how with some popular players:

  • Songbird
  • VLC
  • Clementine
  • (more)

To play FLAC files:

  • AlsaPlayer
  • Amarok
  • MPlayer
  • Muine: a music player for GNOME
  • VideoLAN client
  • Xine multimedia player
  • xmcd: X CD player
  • (more)

Mobile

  • Android has native support for FLAC since 3.1
  • Songbird for Android and iOS

Notable features of FLAC:

  • Lossless: The encoding of audio (PCM) data incurs no loss of information, and the decoded audio is bit-for-bit identical to what went into the encoder. Each frame contains a 16-bit CRC of the frame data for detecting transmission errors. The integrity of the audio data is further insured by storing an MD5 signature of the original unencoded audio data in the file header, which can be compared against later during decoding or testing.
  • Fast: FLAC is asymmetric in favor of decode speed. Decoding requires only integer arithmetic, and is much less compute-intensive than for most perceptual codecs. Real-time decode performance is easily achievable on even modest hardware.
  • Hardware support: FLAC is supported by dozens of consumer electronic devices, from portable players, to home stereo equipment, to car stereo.
  • Flexible metadata: FLAC’s metadata system supports tags, cover art, seek tables, and cue sheets. Applications can write their own APPLICATION metadata once they register an ID. New metadata blocks can be defined and implemented in future versions of FLAC without breaking older streams or decoders.
  • Seekable: FLAC supports fast sample-accurate seeking. Not only is this useful for playback, it makes FLAC files suitable for use in editing applications.
  • Streamable: Each FLAC frame contains enough data to decode that frame. FLAC does not even rely on previous or following frames. FLAC uses sync codes and CRCs (similar to MPEG and other formats), which, along with framing, allow decoders to pick up in the middle of a stream with a minimum of delay.
  • Suitable for archiving: FLAC is an open format, and there is no generation loss if you need to convert your data to another format in the future. In addition to the frame CRCs and MD5 signature, flac has a verify option that decodes the encoded stream in parallel with the encoding process and compares the result to the original, aborting with an error if there is a mismatch.
  • Convenient CD archiving: FLAC has a “cue sheet” metadata block for storing a CD table of contents and all track and index points. For instance, you can rip a CD to a single file, then import the CD’s extracted cue sheet while encoding to yield a single file representation of the entire CD. If your original CD is damaged, the cue sheet can be exported later in order to burn an exact copy.
  • Error resistant: Because of FLAC’s framing, stream errors limit the damage to the frame in which the error occurred, typically a small fraction of a second worth of data. Contrast this with some other lossless codecs, in which a single error destroys the remainder of the stream.

What FLAC is not:

  • Lossy. FLAC is intended for lossless compression only, as there are many good lossy formats already, such as Vorbis, MPC, and MP3 (see LAME for an excellent open-source implementation).
  • DRM. There is no intention to add any copy prevention methods. Of course, we can’t stop someone from encrypting a FLAC stream in another container (e.g. the way Apple encrypts AAC in MP4 with FairPlay), that is the choice of the user.
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