Closes gh-4 Check for image type using imghdr module
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				@ -17,6 +17,7 @@ import pyexiv2
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import re
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					import re
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import subprocess
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					import subprocess
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import time
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					import time
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					import imghdr
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"""
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					"""
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Media class for general video operations
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					Media class for general video operations
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@ -88,6 +89,12 @@ class Media(object):
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    """
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					    """
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    def is_valid(self):
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					    def is_valid(self):
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        source = self.source
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					        source = self.source
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					        # gh-4 This checks if the source file is an image.
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					        # It doesn't validate against the list of supported types.
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					        if(self.__name__ == 'Photo' and imghdr.what(source) is None):
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					            return False;
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        # we can't use self.__get_extension else we'll endlessly recurse
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					        # we can't use self.__get_extension else we'll endlessly recurse
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        return os.path.splitext(source)[1][1:].lower() in self.get_valid_extensions()
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					        return os.path.splitext(source)[1][1:].lower() in self.get_valid_extensions()
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