These appear to be taglib-sharp (the library I'm using) limitations. If you share sample mp3s for these cases I can verify. Unfortunately, if that is indeed the case, there's not much I can do about it seeing as I'm using the latest version according to their github page (https://github.com/mono/taglib-sharp/releases). I'd suggest opening an issue, but it looks pretty abandoned :(
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I realized my answer could use some clarification
(1) I believe this is a taglib-sharp issue.
(2) Again, I believe in this case taglib-sharp simply sees the two genres as one. I suppose I could identify such cases and re-encode the genres back as two separate genres (which is the right thing to do only if genres are guaranteed to never have ";" in their name, or at least that's the vast majority in practice).
(3) Here I can't tell from your report whether I parsed the genres correctly or I got both as a single one (as in case 2 above). This is because "," is the delimiter used by tagger#. Again, there is a question of whether it's reasonable to assume genres won't include ",".
To sum up, I'll need a repro sample file for each of the above to be sure, and I need to know whether genres can include "," / ";" to do the right thing (where I can).
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It appears that tagger# does not support multiple genres.
MP3 with TCON = "genre1(null)genre2" outputs: "genre1" expected: genre1(some tagger# delim)genre2
MP3 with TCON = "genre1;genre2" outputs: "genre1;genre2" expected: genre1(some tagger# delim)genre2
MP3 with TCON = "genre1,genre2" outputs: "genre1,genre2" expected: genre1(some tagger# delim)genre2
The first is by standard, the other 2 is common in the wild.
These appear to be taglib-sharp (the library I'm using) limitations. If you share sample mp3s for these cases I can verify. Unfortunately, if that is indeed the case, there's not much I can do about it seeing as I'm using the latest version according to their github page (https://github.com/mono/taglib-sharp/releases). I'd suggest opening an issue, but it looks pretty abandoned :(
I realized my answer could use some clarification
(1) I believe this is a taglib-sharp issue.
(2) Again, I believe in this case taglib-sharp simply sees the two genres as one. I suppose I could identify such cases and re-encode the genres back as two separate genres (which is the right thing to do only if genres are guaranteed to never have ";" in their name, or at least that's the vast majority in practice).
(3) Here I can't tell from your report whether I parsed the genres correctly or I got both as a single one (as in case 2 above). This is because "," is the delimiter used by tagger#. Again, there is a question of whether it's reasonable to assume genres won't include ",".
To sum up, I'll need a repro sample file for each of the above to be sure, and I need to know whether genres can include "," / ";" to do the right thing (where I can).