ALBUMARTIST via question

Michael Helmling michaelhelmling at
Sat May 9 19:39:03 UTC 2015

Good that you found out by yourself! ;-) The explanation for your
observation is that currently neither Tag::properties() nor
File::properties() are virtual due to binary compatibility (they will be
in taglib-2.0). The implementation of File::properties() does some
manual type-checking for calling the appropriate subclass method, which
is not the case in Tag::properties() - it has either been overlooked or
simply been considered unnecessary.


Am 09.05.2015 um 21:06 schrieb Rob Arnold:
> Thank you.
> So turns out that if you get the property map like I did in the sample code I had in my msg,
> TagLib::FileRef f(filename, false);
> TagLib::Tag *t=f.tag();
> auto props = t->properties();
> that the property map isn’t completely filled out - just has the basic stuff.
> But if you get the property map as:
> TagLib::FileRef f(filename, false);
> auto props = f.file()->properties();
> Then the property list is fully populated with all tags as well as the unsupporrtedData() filled in.  Just what I need.  I discovered this after (belatedly) looking at the example code.  I don’t get why the properties from the Tag shouldn’t have worked though - and the FileRef file() member is documented as being something you probably shouldn’t use, so surprises me.  But it works and its in the examples, so I’m running with it :)
>> On May 9, 2015, at 3:15 AM, Michael Helmling <michaelhelmling at> wrote:
>> Hi Rob,
>> you're absolutely correct about the purpose and functionality of the
>> properties() interface, and it should work for all tag types that
>> implement it (containing ID3v2, APE and Xiph comments). It does not for
>> ID3v1, however - have you checked that your mp3 files are using ID3v2?
>> (they might have both; in that case: make sure that ALBUMARTIST exists
>> not only in the v1-Tag).
>> Otherwise, I don't have an explanation. Please check that you are using
>> a recent version of taglib. If the problem remains, perhaps you can
>> upload one example file so that we can try to reproduce your issues.
>> Michael
>> _______________________________________________
>> taglib-devel mailing list
>> taglib-devel at

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