M4A (Audio MPEG-4)

M4A e a extensao de ficheiro de audio MPEG-4 utilizada principalmente para audio codificado em AAC ou ALAC. E o formato utilizado pela Apple para musica do iTunes, podcasts e Apple Music.

Tipo MIME

audio/mp4

Tipo

Binário

Compressão

Com perdas

Vantagens

+ Better audio quality than MP3 at equivalent file sizes
+ Native support on Apple devices, iTunes, and most modern players
+ Supports both lossy (AAC) and lossless (ALAC) codecs
+ Rich metadata with album art, chapters, and lyrics

Desvantagens

− Less universal than MP3 for older devices and car stereos
− AAC encoding has licensing considerations
− Some Android and Linux players require codec installation

Quando usar .M4A

Use M4A para musica e podcasts no ecossistema Apple. Para audio com perda universal, o AAC em qualquer container e amplamente suportado.

Detalhes técnicos

O M4A utiliza o container MP4 (ISO Base Media File Format) com codec de audio AAC ou ALAC. Suporta metadados (tags iTunes, capa de album), chapters e gapless playback. Os ficheiros sao tecnicamente identicos ao MP4 apenas com audio.

Histórico

A Apple popularizou a extensao .m4a para distinguir ficheiros de audio MPEG-4 dos ficheiros de video .mp4. A iTunes Store lancou com musica AAC protegida (.m4p) em 2003, transitando para AAC sem DRM (.m4a) em 2009.

Converter de .M4A

.m4a → .aac .m4a → .ac3 .m4a → .aiff .m4a → .alac .m4a → .amr .m4a → .ape .m4a → .flac .m4a → .mid .m4a → .midi .m4a → .mp3 .m4a → .ogg .m4a → .opus .m4a → .wav .m4a → .wma

Converter para .M4A

.aac → .m4a .ac3 → .m4a .aiff → .m4a .alac → .m4a .amr → .m4a .ape → .m4a .flac → .m4a .mid → .m4a .midi → .m4a .mp3 → .m4a .ogg → .m4a .opus → .m4a .wav → .m4a .wma → .m4a

Formatos relacionados

.aac .ac3 .aiff .alac .amr .ape .flac .mid .midi .mp3 .ogg .opus .wav .wma

Termos relacionados

M4A

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