Playing the next file sometimes fails if the next one is flac. The following shows up in the terminal:

Gjs-Message: JS LOG: URI:file:///home/kyoushuu/Music/01%20Hello%20Alone.flac
Gjs-Message: JS LOG: Error:Gst.StreamError: GStreamer encountered a general stream error.,gstbaseparse.c(3038): gst_base_parse_loop (): /GstPlayBin:player/GstURIDecodeBin:uridecodebin36/GstDecodeBin:decodebin38/GstFlacParse:flacparse25:
streaming stopped, reason not-linked

Sometimes it will even result to a segmentation fault. I also saw about twice an error from GStreamer that says something like the program shouldn't do something on a certain thread and should post a message instead to GStreamer; unfortunately I can no longer find it because the logs of grilo pushed it away. I can no longer reproduce that one.

I tried the same files on Rhythmbox and there are no errors. I use Fedora 19 (though I have the same problem in openSUSE 12.3 with GNOME 3.8 repo) and build gnome-music using jhbuild. I skipped gstreamer and its plugins in jhbuild so they should be using the same version.

I tried looping a set of two MP3 then two FLAC files (I changed gnome-music a bit to achieve replay). The MP3 files successfully played several times, but the FLAC fails.

Also, those files are Japanese songs, maybe the reason is that they have kanji in their metadata? Two of the songs (though they are not FLAC) are not read properly; their title are junk. I also had this problem before in Rhythmbox but 2.99.1 (or an older release) fixed that.

Also noticed that the cover of most of my songs are not displayed - on those FLAC files, only one has a cover (though the problem occurs on this one too). Rhythmbox could load the cover on most of those files.

Sorry for a very long bug report, I noticed a lot of things and don't know which one really causes the issue. I'm just trying to give the whole idea of what's going on here that might give a clue. I don't know how to debug JavaScript.

bgo# 701367 is needed if you want the URL to show up in the error message.