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The following article was published in our article directory on December 20, 2010.
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Convert AAC to M4A

Article Category: Computers and Technology

Author Name: Matt Wain

Considering MP3's reputation as an audio compression format that sacrifices a lot of fidelity, the introduction of the AAC format was an improvement not only in terms of data usage efficiency but also in audio quality. An audio encoded in 96 kbps compression in an AAC format is already comparable to a 128 kbps compression in MP3 in terms of sound quality and many even concluded that at 128 kbps compression in AAC will play as well or even better than a 192 kbps compression in MP3. Yet many listerners still felt the need to convert AAC to M4A even if the method of encoding is really just the same.

There is really no major difference between the two (AAC and M4a) but just the extension name of the file. Basically, AAC is just the lossy encoding method of an audio while M4A is a file extension to make a distinction that the file is intended just for audio. M4A just became in vogue as the acceptance for the method it is encoded, the AAC file compression, is becoming more and more compatible with many playback programs. Moreso, when iTune and iPhone adopted it as its default playback codec which tremendously helped its acceptability.

M4A or MPEG Audio 4 is like the MP4 or MPEG 4 only that it differentiates M4A as a a mere audio compression format while the MPEG 4 or MP4 is the video and audio compression format. It is important to mention that both MP4 and M4A are containers of AAC. When the output is restricted to a mere audio, that is the circumstance where file extensions are made into M4A. AAC comes in as the method where the audio of MP4 is encoded as a raw audio stream and that the M4A extension is the container to distinguish the mere audio personality of the file.

There are also end users who has the opinion that audios encoded in M4A extension sounds more musical than the plain AAC especially with music that has steep transients like high quality piano musical. Which is why many convert AAC to M4A. But even, M4A or MPEG 4 Audio is just a better version of MP3 which shrinks down the size of music to be played in the improved audio compression method and better playback quality of AAC.

The mix up between these file format extensions may have come impression that different file extension also meant a different codec (compression|decompression). While this can be the case for other formats, this is not the case in AAC and M4A. Because audios that are encoded in AAC format compression can also assume the AAC, MP4 and M4A file extensions. Basically, AAC is the method which the audio is encoded while MP4 and M4A are the containers.

Maybe, the most compelling reason why people convert AAC to M4A file extension is for them to have the ability to stream, share and distribute content without having to worry about the restriction and license to do so. Because files which has the M4A extension are not required to pay royalties when you distribute it. The savings associated in converting files to M4A extension just proves to be irresistible for most people.

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