I/O operation on closed file

[GoogleCodeExporter]

After running `vid -i test.mp3 -u` for 35 minutes, it crashes with the 
exception:

    Traceback (most recent call last):
      File "/usr/local/project/.env/bin/vid", line 138, in <module>
        thrd_n=multiprocessing.cpu_count() * 5)
      File "/usr/local/project/.env/local/lib/python2.7/site-packages/voiceid/sr.py", line 1003, in extract_speakers
        start_time)
      File "/usr/local/project/.env/local/lib/python2.7/site-packages/voiceid/sr.py", line 1010, in _cluster_matching
        self._match_clusters(interactive, quiet)
      File "/usr/local/project/.env/local/lib/python2.7/site-packages/voiceid/sr.py", line 837, in _match_clusters
        clu, speakers[clu])
      File "/usr/local/project/.env/local/lib/python2.7/site-packages/voiceid/sr.py", line 1486, in _interactive_training
        " name\n Press enter to skip\n> ")
    ValueError: I/O operation on closed file

Original issue reported on code.google.com by chrisspen@gmail.com on 14 Feb 2014 at 7:09