album artwork showing up intermittently

Oh, I guess if the artwork was correctly embedded I would see it here at the bottom of this panel?

perhaps the missing art isn’t compliant with Sonos’ requirements. 
 

https://support.sonos.com/en-ca/article/missing-music-library-album-art-in-the-sonos-app

Copied from the link:
 

Album art requirements:

• Artwork embedded into the music files must be in one of the following formats: JPG, BMP, GIF or PNG.
• Maximum resolution for embedded artwork is 1024 x 1024.
• iOS devices support album artwork up to 320kb in size with no resolution limit.
• If album artwork is saved in the album folder instead of embedded in the files, it must be in JPG or GIF format and named folder.xxx (e.g., folder.jpg or folder.gif). Each album should be in its own folder and contain a single image file.

It suggests that it will not read a folder.png. But I don’t think that’s true. In any case the art must be embedded or it wouldn’t show in apple music (itunes) in the first place, right? Also, I do have some albums with missing artwork, and they have a valid folder.jpg jpeg image.

 Where does the last screenshot come from?  I think it’s your NAS, right?  I’ve seen this before in the Sonos app where if the track name includes the track number & has no album art then Sonos is rejecting it for some reason.  Usually when this happens to me the file name includes an illegal character ( usually ann illegal apostrophe ).  I don’t see that in the two track names I see in your screenshot.  Of course I don’t know for sure where that last screenshot is from.

 I’m afraid I don’t have a MAC nor do I use Apple on my Windows computer mostly cause Apple doesn’t like FLAC.  I use JRiver Media Center.

The art may be embedded (if bliss says it is it is), but does your artwork rule in bliss allow images bigger than 1024x1024 and 320kb? 

I looked at some of the “bad” images, and they weren’t that big. But I’ll add that rule - I did used to use it.

oh, but I don’t think bliss has a rule for max size. I’ll just look for that.

 I have many album art files in the album folders over 1024 x 1024, over 320kb and they all have unique names. They all show in Sonos.  Also several of the album cover files are .png.  Maybe because they are all embedded in the album tags is why they all show in Sonos.  Maybe Sonos looks at the tags first or maybe that’s all they look at.

Maybe the restrictions on allowable names?

Scroll down to the Added section here

https://stan-miller.livejournal.com/357.html

Added October 2023. ----------------------------

Much digging into the Samba configuration details and code versions turns up an issue. The filename ‘illegal’ character mapping needs to be configured differently in later Samba versions because the ‘mangled map’ option there is gone and replaced with the catia vfs options

continues at link

well, I configured bliss to only make folder jpeg, not png. told it to keep art below 900X900. seems to be working better now!