poor error message from ffmpeg_reader.py #157
Merged
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Per http://stackoverflow.com/questions/11497234/typeerrorexceptions-must-be-old-style-classes-or-derived-from-baseexception-no, as of python 2.6, you can't raise just a string. If this particular error is triggered, you just get a message
The nearby exceptions are IOErrors, so I made this one an IOError as well. Now it shows the real exception, instead of the cryptic message above.