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Ashwell
Contributor I
Jan 16, 2021 5:08 PM UTC
Answered

Playing .m4a files

Both ALAC and AAC files use suffix .m4a How does Sonos differentiate between these two formats

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ratty
rattyAnswer
Jan 16, 2021 5:16 PM UTC

From the metadata, in the file header. 

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4 replies

John B
Jan 16, 2021 5:16 PM UTC

Differentiate in what sense? For what purpose? I assume it is clear from the music file metadata.

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ratty
rattyAnswer
Jan 16, 2021 5:16 PM UTC

From the metadata, in the file header. 

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Ken_Griffiths
Ken_Griffiths
Jan 16, 2021 5:16 PM UTC

.m4a is a container and Sonos devices will play .alac (lossless) or aac (lossy) from devices at the bitrates shown in this Sonos support document:

https://support.sonos.com/s/article/79

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    AshwellAuthor
    Contributor I
    Jan 16, 2021 6:01 PM UTC

    Thanks - I now understand that Sonos differentiates .m4a files as to whether they are ALAC and AAC from the metadata in the file header that identifies the bitrate available.

     

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