Playing .m4a files

  • 16 January 2021
  • 4 replies

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


Best answer by ratty 16 January 2021, 18:16

From the metadata, in the file header. 

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4 replies

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

From the metadata, in the file header. 

.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:

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.