GenericException in taking the duration of the song (mp3)

[anespa]

Dear Friends,
I am working on a sample code for an audio player for mp3. It works fine
last day , but day after it show a GenericException as shown:



that relevant line is 


I attach the working code below...

It can run like the command

$python forwardbackward.py /tmp/*.mp3
(it will take all mp3 file in that path as playlist)

please look code attached below and advise
forwardbackward.py
<http://gstreamer-devel.966125.n4.nabble.com/file/n4675698/forwardbackward.py>   




Thanks
Anes







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