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Vorbis Metadata Support

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TheAlmightyGuru:
According to the official Vorbis metadata documentation, when multiple artists collaborate on a single song, you are encouraged to add multiple artist tags into the metadata. The example given on their web site (http://www.xiph.org/vorbis/doc/v-comment.html) says, if the artists are "Dizzy Gillespie, Sonny Rollins, and Sonny Stitt," the tagging software should write the following into the metadata:

ARTIST=Dizzy Gillespie
ARTIST=Sonny Rollins
ARTIST=Sonny Stitt

I have some songs in Vorbis format, and they are collaborations between multiple artists. The program I used to tag the music did so according to the Vorbis specifications--when I open the file in a hexeditor, I can see three ARTIST tags, each with one of the names I entered. However, when I played the song in Rockbox, I only the first artist was displayed.

After reading the manual, specifically the Audio and Metadata Formats section (http://download.rockbox.org/daily/manual/rockbox-sansaclipzip/rockbox-buildap2.html#x18-367000B), I found that this deviation is by design.

I understand that Rockbox has to work with limited memory and many different devices, so it can't support every possible option in every format, so I'm fine with a workaround. My question is, does the Rockbox team suggest a particular workaround, or do they know of a program which will automatically convert standard tags to rockbox-compliant tags? Thanks!

saratoga:
I think the work around would be to only have one artist tag per file, or if you want multiple, put the most important one first. 

TheAlmightyGuru:
Thanks for the reply. I've been playing with the program that I used to tag the Vorbis files (foobar2000), and there doesn't appear to be a way to tell it to combine the various artist flags into a single tag--which is understandable since it is the standard.

However, I did find that if I replace the semi-colon separator with a comma, they are combined as a single artist in the metadata. Unfortunately, this breaks foobar2000's built-in multi-tag support. Rather than ruin the tags in my library, I was thinking I could just alter the files on my DAP, but of course, I'm one of those people who listen to a lot of Broadway musicals, so I have a lot of tracks with multiple artists.

Does anyone know of a program that can quickly batch convert from the Vorbis standard to Rockbox's single artist tag variance? Thanks?

TheAlmightyGuru:
I've been reading through the Rockbox metadata source code, and it looks like modifying it to concatenate multiple artists to make it more Vorbis-compliant would be a pretty trivial process.

Thus, where the Vorbis tags read:

ARTIST=Dizzy Gillespie
ARTIST=Sonny Rollins
ARTIST=Sonny Stitt

It would show up to users as:

ARTIST:Dizzy Gillespie; Sonny Rollins; Sonny Stitt

Although, from the looks of the code at the end of metadata_common.c, the code is purposely non-compliant. However, since a lot of the code is shared, I'm not sure if this is specifically directed toward ID3 tags and not Vorbis.

I would like to submit a patch to combine artists, but I want to know whether I should bother? Will the developers reject the patch?

saratoga:

--- Quote from: TheAlmightyGuru on April 14, 2015, 02:51:50 PM ---ARTIST:Dizzy Gillespie; Sonny Rollins; Sonny Stitt

--- End quote ---

Assuming that doesn't break anything, and you don't run out of space, thats probably ok.


--- Quote from: TheAlmightyGuru on April 14, 2015, 02:51:50 PM ---Although, from the looks of the code at the end of metadata_common.c, the code is purposely non-compliant. However, since a lot of the code is shared, I'm not sure if this is specifically directed toward ID3 tags and not Vorbis.
--- End quote ---

Well yeah, we didn't design the entire operating system around some weird thing in Vorbis that no one uses. 

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