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The track number available in an ID3v1 tag is a small unsigned integer number stored in a single byte. If you retrieve this information once MP3::Tag has stored it in such a tag you will only get a numerical value back, without fancy formatting.
The documentation you quote refers to parse_rex() -- a method not related to your code. If you want to find out about the conversion from a Perl scalar holding some numerical value into a raw byte look out for the pack function. Example:
In reply to Re: MP3::Tag - Leading zeros on 'track' truncated
by martin
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