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    copied!<p>I've run into the same problem recently. It seems to be that Phonon has a bit of a hissy fit about ID3 tags, particularly compressed ones. I've taken to creating a temporary copy of every mp3 that I open and using <a href="http://code.google.com/p/mutagen/" rel="nofollow" title="mutagen">mutagen</a> to delete the tags from that copy. I then open the de-tagged temporary file using PyQt/Phonon, and everything works as I expect. BTW, mutagen is awesome.</p> <p>Phonon does have a bit of a habit of failing reasonably silently. This is what I do: check if your <code>MediaObject</code> is in a <code>Phonon.ErrorState</code>; if so check its <code>errorString()</code>, usually some incomprehensible message. Google this message and try to work from there.</p> <p><strong>Edit:</strong> Hmm, interesting. It's not Phonon having the problem, it's the DirectShow backend not being able to play the file with the compressed ID3 headers. While the "fix" I outline above does work, I found I was still having problems playing other types of files, e.g. .m4a, despite having the right codecs installed.</p> <p>The solution was to install the <a href="http://www.free-codecs.com/download/K_lite_codec_pack.htm" rel="nofollow" title="K-Lite Codec Pack">K-Lite Codec Pack</a>, and use the <code>Win7DSFilterTweaker</code> tool that comes with it to change the default decoder for the various codec types from "Microsoft" to "ffdshow". You might also need to run the <em>ffdshow audio decoder configuration</em> tool and tick the box marked <em>Show dialog when an unknown application tries to load ffshow</em> in the <em>DirectShow control</em> tab.</p>
 

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