(windows) command line m4a tagger?

[skeptic Mike]

(21-11-2017 22:51)paultaylor Wrote:  

(21-11-2017 22:44)skeptic Mike Wrote:  If all available programs make multiple atoms, then it may be better to do nothing. I don't know for sure, but I have the impression that mp3tag is likely the most popular tagger with working multi value support. Perhaps Paul knows more about this, as he must have to rewrite broken tags.

I would agree with Mike that other than for completeness there does not seem to be much point in supporting the way AtomicParsley does things since I don't know of any other applications that support this way so even if MinimServer understands it if you want to use another tool like Mp3Tag to edit your tags it will not support it. Unsuprisngly my own taggers (SongKong/Jaikoz) do multiple values the same way that MP3Tag does them.

I've just looked at the python mutagen library. This does the same as my hacked AtomicParsley, in that it puts multiple data atoms under the name. It does this for the standard tags ('\xa9wrt etc) as well. What's more if you have mp3tag style multiple tags, it reads them happily, but writes them back in the multiple data atom form when you force it to rewrite the tags, e.g. by adding an additional different tag.

The mutagen library is supported, and although it doesn't seem to be used to create multiple value tags in Ex Falso, I know that it's used in puddletag. puddletag's author's suggest that it is mostly functionally equivalent to mp3tag, so I wonder if it supports multiple value m4a tags.

mp4 tags seem to be in such a mess. And that's without considering the unspeakable things that windows explorer does to create it's own private tags.