I certainly seeing the failure mode you suggest. The third lookup in this log has an empty artist. There are a variety of other responses after this including HIT, NO ARTWORK and FAILED PREVIOUSLY.
thumbnailer-service: [21:20:04.256] "album: Joan Baez/Queen of Hearts (512,512): 0.003812 sec (HIT)" thumbnailer-service: [21:20:04.523] "artist: "Punchy" Anderson/ (512,512): 7.352634 [q: 4.818276, d: 0.586561] sec (NO ARTWORK)" thumbnailer-service: [21:20:04.833] Critical: common_fetch(): Request failed: "Error downloading https://dash.ubuntu.com/musicproxy/v1/artist-art?artist=&album=Irish Whistle CD Edition&key=4e34a78d0ca246f81a7d0a892cc9fba8 - server replied: Bad Request" thumbnailer-service: [21:20:04.834] Warning: "Handler::createFinished(): unity::ResourceException: RequestBase::thumbnail(): key = \0Irish Whistle CD Edition\0artist: fetch() failed" thumbnailer-service: [21:20:04.837] "artist: /Irish Whistle CD Edition (512,512): 7.665484 [q: 5.403909, d: 0.268904] sec (ERROR)" thumbnailer-service: [21:20:04.988] "artist: "Punchy" Anderson/I Need the Green -12" (512,512): 7.817587 [q: 5.084229, d: 0.703537] sec (NO ARTWORK)" thumbnailer-service: [21:20:04.993] "album: Adrain Barker, Ben Stephenson/Undertones (512,512): 0.030632 sec (FAILED PREVIOUSLY)" thumbnailer-service: [21:20:05.003] "thumbnail: /media/phablet/3133-3039/Audio/Music/Blowzabella/Compilation/Death In A Fen _ Bruton Town _ Our Captain Cried.mp3 (512,512): 0.006540 sec (HIT)" thumbnailer-service: [21:20:05.010] "thumbnail: /media/phablet/3133-3039/Audio/Music/Blowzabella/Octomento/Tanteeka And Round The Corner.mp3 (512,512): 0.012198 sec (HIT)" thumbnailer-service: [21:20:05.015] "album: Chorchester Söhre-Kaufunger Wald/Un as der Rebbe tanzt (512,512): 0.009069 sec (FAILED PREVIOUSLY)" thumbnailer-service: [21:20:05.039] "album: Musik: Mische Spoliansky Text: Robert Gilbert/Schlager zum Erröten (512,512): 0.001048 sec (FAILED PREVIOUSLY)" thumbnailer-service: [21:20:05.071] "album: Ashley Hutchings and others/Grandson of Morris On (512,512): 0.001352 sec (FAILED PREVIOUSLY)" thumbnailer-service: [21:20:05.077] "album: Ashley Hutchings and others/Son of Morris On (512,512): 0.000895 sec (FAILED PREVIOUSLY)" thumbnailer-service: [21:20:05.087] "album: The Jockey Morris Men/Five More Men (512,512): 0.000811 sec (FAILED PREVIOUSLY)" -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to thumbnailer in Ubuntu. https://bugs.launchpad.net/bugs/1512608 Title: No thumbnails generated for OGG audio Status in music-app package in Ubuntu: Invalid Status in thumbnailer package in Ubuntu: In Progress Bug description: Setup: Core Music app BQ HD5 OTA-7 15.04 r6 Large collection of audio files in .ogg and .mp3 format on SD card Audio files tagged with Artist, Album titile, Track title etc. Expected result: Album covers and Artist images are displayed in Music app Actual result: Only mp3 audio files generate thumbnails. No Album of Artist thumbnails are generated for any OGG files To test the situation I have a) Cleared the thumbnailer failure cache b) removed the whole thumbnail cache directory c) Removed and reinsterted the SD card d) Uninstallled and reinstalled the core Music app Before the OTA-7 upgrade the thumbnails were shown for .ogg and .mp3 files To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/music-app/+bug/1512608/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
