Comment 7 for bug 1856745

I tried the same version of amarok, without rebuilding, with the current master of gstreamer.
(gstreamer commit:8140da74ba474d2f218c0c85944c89d6be38e545)
(gst-plugin-bad commit:2a3205b294cb881bb1d60ad9bf7c9841031fb2f4)
(gst-plugins-base commit:940c9998e5cfffd90fade8a7f39f29a426e20460)

This version seems to work without causing any freezes.
It also allows to seek and rewind on said aiff files.

As a workaround I decided to remove the gstreamer phonon backend and install the vlc one instead.

This problem will probably "solve itself", with the newer gstreamer libraries in the next Ubuntu versions.

tl;dr:
This is most likely a gstreamer issue, that affects amarok, not an actual bug in amarok itself.