Implementation in Non-mp3s and Alternatives
ID3 tags were designed with MP3 in mind, so they would work without problems with MP3 and MP3Pro files. However, the tagsets are an independent part of the MP3 file and should be usable elsewhere. In practice, the only other format which widely uses ID3v2 tags is AIFF, where the tag is stored inside an IFF chunk named "ID3". The same could be accomplished in WAV, but isn't. The only tagging system in wide usage for WAV is the Broadcast Wave Format, stored as a RIFF chunk. Windows media ASF files (WMA, WMV) have their own tagging formats but also support ID3 Tags embedded as attributes. MP4 also allows the embedding of an ID3 tag, and this is widely supported, especially in Apple's iTunes, which uses MP4 standards in its audio and video file formats. Other container-based formats use their own tagging formats. An example of this is Ogg, which uses Vorbis comments. Adding ID3 tags to these would break the container structure. Earlier versions of Winamp such as 2.xx have been proven able to add ID3v1 and ID3v2 tags to MP1 and MP2 files.
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