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I have test with that one:

data.putstring(self)

from original pack, but all accent are bad encode, but I can
read from arc library selection my track

and with your patch:

data.putstring(self.unpack("C*").pack("U*"))

all accent are successfull shown in Arc Library, but I
couldn't read any more my file. My file have accent too

I don't program with ruby, and I just want to know how can I
do to just encode mp3info, and not filename in utf-8

To know:
My system are totally under UTF-8
I use iocharset=utf8 for mounting vfat drive,
all done when I don't use Arc Library,
but fail with it like in the top of this message

Do you have an idea ?