Appendix B. Audio and metadata formats 213
B. Audio and metadata formats
B.1. Supported audio formats
B.1.1. Lossy Codecs
Format Extension Notes
ATSC A/52 (AC3) .a52, .ac3,
.rm, .ra,
.rmvb
Supports downmixing for play-
back of 5.1 streams in stereo
ADX .adx Encrypted ADX is not sup-
ported.
Advanced Audio Coding .m4a, .m4b,
.mp4, .rm,
.ra, .rmvb
Supports AAC-LC, -HEv1,
and -HEv2 profiles
MPEG audio .mpa, .mp1,
.mp2, .mp3
MPEG 1/2/2.5 Layer 1/2/3
Musepack .mpc Supports SV7 and SV8 in
mono/stereo
OGG/Vorbis .ogg, .oga Playback of some old “floor 0”
files may fail on low memory
targets. Files with album art
larger than available RAM will
be skipped. Chained Ogg files
are not supported.
Sony Audio .oma, .aa3,
.rm, .ra,
.rmvb
Supports ATRAC3
RealAudio .rm, .ra,
.rmvb
Supports RealAudio G2
(Cook)
Speex .spx
Dialogic telephony type .vox
Windows Media Audio Standard .wma, .wmv,
.asf
Windows Media Audio Professional .wma, .wmv,
.asf
Note: AAC-HE profiles might not play in realtime on all devices due to CPU perfor-
b
The Rockbox manual (version 3.14) Sansa Fuze+
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