Thanks for the tip no_slogan, I actually print tried all of them and I got the same result for (I An unsigned integer and for V A long integer in VAX order). Output can be viewed under:

This is the content of lines_0 with I: 990183424
This is the content of lines_1 with I: 826626132
This is the content of lines_2 with I: 167772160
This is the content of lines_3 with I: 1090519040

This is the content of lines_0 with V: 990183424
This is the content of lines_1 with V: 826626132
This is the content of lines_2 with V: 167772160
This is the content of lines_3 with V: 1090519040

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When I tried to print the (N A long integer in network order) option I got this result:

This is the content of lines_0: 1339
This is the content of lines_1: 1414546737
This is the content of lines_2: 10
This is the content of lines_3: 65

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The reason that I was using the (I An unsigned integer) characters is that on the official website description says:

http://id3.org/id3v2.4.0-structure 
%x is used to indicate a bit with unknown content.

ID3v2 size 4 * %0xxxxxxx

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The ID3v2 tag size is stored as a 32 bit synchsafe integer (section 6.
+2), making a total of 28 effective bits (representing up to 256MB).

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In reply to Re^3: ID3v2 TAG unpack uninitialized value by thanos1983
in thread ID3v2 TAG unpack uninitialized value by thanos1983

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