Mercedes-Benz Sound 5 Operator's Manual page 27

Notes on MP3/WMA operation
The following points should be taken into ac-
count when using MP3 and WMA CDs:
Only MP3/WMA files (tracks) that have
been written on a CD using ISO 9660/
Joliet file system can be played by the
system.
In particular, read errors may occasional-
ly occur with discs you have copied your-
self, even if the disc can generally be read
correctly.
Display of album and track name is limit-
ed to a maximum of 31 characters (de-
pending on which character set is used).
This equipment can play both write-once
CDs (CD-R) and rewriteable CDs (CD-
RW).
Multisession CDs should be finalized to
prevent playback problems.
Multi-session CDs containing both audio
tracks and MP3/WMA tracks (mixed
mode) are handled according to what is
contained in the first session. If the first
session contains audio tracks, the CD is
treated as an audio CD. In such cases,
any data stored in the second session
cannot be played. Accordingly, only
MP3/WMA tracks may be played back if
this is what is contained in the first ses-
sion.
The maximum number of folders per CD
is 255. The maximum total number of
folders and tracks (files) on a CD is 999.
When moving between folders and
tracks, these are displayed and selected
linearly. Any existing hierarchical (nest-
ed) folder structure is handled as a linear
sequence.
Information regarding MP3 files
To display the track and album name, you
need to add the corresponding data (ID3
tags) to the MP3 file before writing the
CD.
General information
We recommend a constant bit rate of at
least 160 kbit/sec for the compression
of MP3 data. With variable bit rates, the
display of the elapsed playback time may
differ from the time actually elapsed.
The file extension for MP3 files must be
"mp3" and must be separated from the
file name by a period. If any other file ex-
tension is used, this will not be recog-
nized by the equipment.
Information regarding WMA files
To display the track and album name, you
need to add the corresponding metadata
to the WMA file.
The file extension for WMA files must be
"wma" and must be separated from the
file name by a period. If any other file ex-
tension is used, this will not be recog-
nized by the equipment.
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A number of factors influence whether or
not a WMA file can be played, including:
sampling rate
bit rate
encoding process
software used for the creation of the
WMA files
writing software
other settings (e.g. copy protection,
Digital Rights Management, ad-
vanced audio format settings)
To create WMA files, use only current stan-
dard software, a sampling rate of 44.1 kHz
and bit rates between 16 and 320 kbit/s. Do
not use other settings, such as lossless cod-
ing, surround sound, DRM, copy protection,
etc.
Do not use compilations that contain WMA
files with other settings as this may render
the CD unplayable even if only some files on
the CD do not fulfill the required standards.
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