[SOLVED] WMV files go mute after a few seconds of playback and stop playing soon after

[Gyuunduh]

I am running Xbian 1.0beta2, XBMC version 12.2 xxxx]cb29 (Compiled Oct 2 2013)
on an Raspberry pi 512 MB model B. Everything is up to date as far as apt-get update and upgrade take me using the official main branches.

Most everything works as it should, but today I noticed that .wmv video files start playing, cut the audio out pretty soon and after that also the video freezes although the play time elapsed counter still ticks on. Previously the exactly same files have been played with no problems. I can't say which package update made them stop playing properly.

I have bought and installed the VC-1 license.

When I try to play a video file (example http://archive.org/download/Windows7WildlifeSampleVideo/Wildlife.wmv ) the symptoms are as decribed above.

xbmc.log:
http://pastebin.com/nJYejTEj

A similar problem has been reportedon OpenELEC forums: http://forum.xbmc.org/showthread.php?tid=174024&pid=1511747 with a probably working solution https://github.com/popcornmix/xbmc/commit/600db214657c7b6b6feda8112846c028e3c175e0
Too bad my skills are not enough to apply them to xbian as I can't find OMXAudio.cpp from my xbian file system and modifying the git and compiling a working copy is too hardcore for me, if that's what it takes to get it working again.

Anyway, there's a problem and a possible solution as well. Hope you can do something about it. Thanks in advance.

I posted this also on github but as the community seems to be more active here, I copied it here.