Flac errors in system info, moode 5

[TheOldPresbyope]

Any one explain the following flac errors I am getting in moode 5.0, using Audiophonics ES9038Q2M (pre 2019) driver?

20190419 135719 worker: Ready
   20190419 140141 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140141 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140141 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140141 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140316 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140316 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140316 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140316 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140322 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/HiRes/AcDc - Rock or Bust (2014) (24-96)/01-Rock or Bust.flac
   20190419 140322 coverart: flac: Zend media exception: Unknown field: _identifier

Zend is saying it's find a VORBIS_COMMENT field with the name _identifier which it doesn't recognize. I believe it just ignores such fields so this error message should be harmless.

I use metaflac to examine metadata in FLAC files. It comes as part of the raspbian package "flac"

Code:

pi@moode:~ $ sudo apt-get install flac
...

Then to read the metadata (which are encoded in FLAC as comments in a VORBIS_COMMENT block):

Code:

pi@moode:/mnt/NAS/OMV-NFS/Greg Harrison Jazz Band - Volume 2 $ metaflac --list --block-type=VORBIS_COMMENT 01*
METADATA block #1
 type: 4 (VORBIS_COMMENT)
 is last: false
 length: 528
 vendor string: reference libFLAC 1.3.2 20170101
 comments: 16
   comment[0]: AccurateRipResult=AccurateRip: Not in database   Secure: Yes   [DE31CA7C]
   comment[1]: AccurateRipDiscID=017-002cf4e2-0239ffbf-e010d511-1
   comment[2]: Source=CD (Lossless)
   comment[3]: CDDB Disc ID=E010D511
   comment[4]: Encoded By=dBpoweramp Release 16.4
   comment[5]: Encoder=(FLAC 1.3.2)
   comment[6]: Encoder Settings=-compression-level-5
   comment[7]: TRACKTOTAL=17
   comment[8]: DISCTOTAL=1
   comment[9]: TITLE=Way Down Yonder in New Orleans
   comment[10]: ALBUM=Greg Harrison Jazz Band - Volume 2
   comment[11]: GENRE=Jazz
   comment[12]: ALBUMARTIST=Greg Harrison
   comment[13]: DISCNUMBER=1
   comment[14]: DATE=2004
   comment[15]: TRACKNUMBER=1

Do you see anything like _identifier in your metadata?

Regards,
Kent

PS - Irrelevant bit of trivia: Greg Harrison is a friend of mine. Love his throwback Dixieland jazz style. He was mentored by Pete Fountain in New Orleans and plays a clarinet Pete gave him.

===ADDED IN POST EDIT===

I just noticed that your errors are popping up in the context of coverart. You may want to try running metaflac with only the --list option and not the --block-type option. It will list all the blocks. Be prepared for lots of hex output if you have embedded coverart.

For example, if I do this on the same file

Code:

pi@moode:/mnt/NAS/OMV-NFS/Greg Harrison Jazz Band - Volume 2 $ metaflac --list 01*
<<same output as above followed by>>
METADATA block #2
 type: 6 (PICTURE)
 is last: false
 length: 165475
 type: 3 (Cover (front))
 MIME type: image/jpeg
 description:
 width: 479
 height: 491
 depth: 24
 colors: 0 (unindexed)
 data length: 165433
 data:
   00000000: FF D8 FF E1 1F 5C 45 78 69 66 00 00 4D 4D 00 2A .....\Exif..MM.*
   <<yada yada yada>>
   00028630: F7 EF 2E AC 78 8E BF FF D9 00 00 00 00 00 00 00 ....x....      
METADATA block #3
 type: 1 (PADDING)
 is last: true
 length: 4044