Mopidy slowly plays FLAC 48khz

Mopidy plays 44.1khz FLAC media well, however I usually got timeout error after start playing 48khz FLAC album.

Also when I try mopidy local scan, there are warnings and timeout because of 48KHz FLACs.

Failed looking up file:///in.flac: Timeout after 1000ms

Then at the end of playing the album, mopidy was crashed out if sudden. (mopidy:7085): GLib-ERROR **: 15:24:54.317: ../../../glib/gmem.c:105: failed to allocate 4622123 bytes. I’m using Raspberry Pi 4 btw.

However, gst-launch-1.0 filesrc location='in.flac' ! flacparse ! flacdec ! audioconvert ! audioresample ! autoaudiosink can output immediately fine.

Anyone got the same problem or know how to debug?