Dual XDVDN9131 Installation & Owner's Manual page 58

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The following types of discs/files are
Some recordable DVD's and CD's may be incompatible with this unit,
depending on media type and recording method.
in the root folder of the disc, USB flash drive or SD card. Any empty folders
or folders that do not include MP3/WMA/JPG files are skipped. Refer to your
recording software's user's manual for more information.
depending on the character type.
to ISO9660. MP3/WMA written in the formats other than the above may
not play and/or their file names or folder names may not be displayed
properly.
eliminate skipping.
MP3/WMA files, the unit will play the MP3/WMA files only.
Some files may not play or be displayed correctly, depending on sampling
rates and bit rates.
128kbps or higher constant bit rate
64kbps or higher constant bit rate