[EXT] Re: Album Art Support on Taglib

[Urs Fleisch]

If you need a fast answer, you could go to the online documentation
and look for classes containing "Picture", e.g.

https://taglib.org/api/classTagLib_1_1FLAC_1_1Picture.html#a10173e627bc5e73d7d93f6792d5cb70f
https://taglib.org/api/classTagLib_1_1ASF_1_1Picture.html#acbc8e740c37073fd5bd1bae993f6ade8
https://taglib.org/api/classTagLib_1_1ID3v2_1_1AttachedPictureFrame.html#a24718a3297a719d4415c33c3a3360715
https://taglib.org/api/classTagLib_1_1MP4_1_1CoverArt.html#a1f2af31a68e783940e1fcd07fb293eb3

As you can see, the recommended formats are jpg and png. Since the
`setData()` method accepts simply a `ByteVector`, you could store any
format together with its mime type, but it probably only makes sense
if there is other software which can display it. It would not harm
either to have a look into the corresponding standard documents, for
example section "4.14. Attached picture" in
https://id3.org/id3v2.4.0-frames.