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M4A is a file extension used in compressed MPEG-4 audio files that have a lossy compression algorithm. M4A is pretty much very similar to another popular compressed audio format, but is designed to have better quality in the same or even smaller file size. The M4A format was developed by Apple in 2004 and is based on the QuickTime format. Music available for purchase on iTunes usually uses M4A recordings. Many M4A files are encoded with the Advanced Audio Coding (AAC) lossy codec to reduce file size. Some M4A files may use the Apple Lossless Audio Codec (ALAC) instead. The M4A format provides good compression with high sound quality. Any compatible media player will work to play M4A audio, including Apple iTunes, Windows Media Player, VideoLAN VLC media player, Nullsoft Winamp, Apple QuickTime Player, and others.
An OGG file is a compressed audio file that uses the free, proprietary Ogg Vorbis audio compression. Many connoisseurs of modern audio formats consider the Ogg format to be one of the most promising and, in particular, a worthy competitor to popular formats. Basically, it is a multimedia container format standard that is run by the non-profit organization Xiph.Org. Ogg Vorbis has the most modern and high quality psychoacoustic model, which is why the bitrate / quality ratio is significantly better than that of competitors. The OGG format has the main advantage - with the same bitrate, this format gives a higher quality in comparison with other formats. This 320 kbps bitrate format is used in Spotify broadcasts. In addition to the open source code, it should be noted that OGG is multiplatform. The encoder is compatible with almost all available operating systems.