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Both MP3Shield_Library_Demo.ino and FilePlayer.ino work out of the box, straight from the download. Where FilePlayer.ino is nearly identical to the original MP3Shield_Library_Demo.ino, except with a more serial flexibility, that may help your desired goal.
Are you indicating that MP3Shield_Library_Demo.ino works but FilePlayer.ino? doubt it. As above they work out of the box and with identical under structures.
Your description of the symptoms are consistent with a DREQ interrupt problem. Please refer to the Troubleshooting . Specifically the subsection labeled “Why do I only hear 1 second of music, or less?” (sound familiar)
You can verify a DREQ interrupt problem by not using interrupts. Change the SFEMP3ShieldConfig.h line 195 to
#define USE_MP3_REFILL_MEANS USE_MP3_Polled
rather than USE_MP3_INTx.
