In general, M4P produces better sound quality and files of smaller size, when compared to the MP3 format. M4P stands for MPEG 4 Protected (audio), which is a lossy compression generally intended as the successor to MP3. M4P (.m4p)Ī version of AAC with proprietary Digital Rights Management(Fairplay DRM) developed by Apple for use in music downloaded from their iTunes Music Store. In fact, it's the standard audio compression method used by YouTube, Android, iOS, iTunes, later Nintendo portables, and later PlayStations. The compression algorithm used by AAC is much more advanced and technical than MP3, so when you compare a particular recording in MP3 and AAC formats at the same bitrate, the AAC one will generally have better sound quality.Īgain, even though MP3 is more of a household format, AAC is widely used today. It was developed in 1997 as the successor to MP3, and while it did catch on as a popular format to use, it never really overtook MP3 as the most popular for everyday music and recording. AAC(.aac)ĪAC stands for Advanced Audio Coding. Both M4A and M4B formats can contain metadata including chapter markers, images, and hyperlinks, but M4B allows "bookmarks", whereas M4A does not. M4B, Audiobook/podcast extension with AAC or ALAC encoded audio in an MPEG-4 container. Audio within the m4a file is typically encoded with AAC, although lossless ALAC may also be used. M4A, an audio-only MPEG-4 file, used by Apple for unprotected music downloaded from their Then play the MP3 files on your favorite audio players or another third-party music apps. But with the help of Audible Converter, you can Convert Audible Audiobook AAX to MP3. Generally, AAX files are encoded by DRM and you can only listen to Audible audiobooks on assigned software. M4B contains AAC or ALAC encoded audio in an MPEG-4 container.ĪAX file format is created by Audible. AAX(.aax)Īudiobook format, which is a variable-bitrate (allowing high quality) M4B file encrypted with DRM. The result in real terms is layer 3 shrinks the original sound data from a CD (with a bit rate of 1411.2 kilobits per one second of stereo music) by a factor of 12 (down to 112-128kbps) without sacrificing sound quality. It also adds a MDCT (Modified Discrete Cosine Transform) that implements a filter bank, increasing the frequency resolution 18 times higher than that of layer 2. The stuff the human ear doesn't hear anyway). Layer 3 uses perceptual audio coding and psycho acoustic compression to remove all superfluous information (more specifically, the redundant and irrelevant parts of a sound signal. Layer 3 is one of three coding schemes (layer 1, layer 2 and layer 3) for the compression of audio signals. MP3 is the name of the file extension and also the name of the type of file for MPEG, audio layer 3. The good news is that, in most cases, you won't be able to hear the difference. In the context of audio, that means sacrificing quality and fidelity for file size. Lossy compression is a form of compression that loses data during the compression process.
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