I’m looking for an open source library to detect the language used in an audio file, such as a wav file. After some searches I found This http://sourceforge.net/projects/marf/files/Applications/%5Bg%5D%20LangIdentApp/ from MARF ( Modular Audio Recognition Framework).. Someone had already use it?
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Check CMU Sphinx Open Source Toolkit For Speech Recognition this project is quite active and in googles summer of code 2012.