decoder/encoding tetra sample

I have download one sample from osmocom speech codec http://tetra.osmocom.org/trac/wiki/Speech_Codec. I have compiled it sucesssfully then the output "ccoder.exe" and "cdecoder.exe" have been built. When i try to run the sample exe file using the command line, it show Segmentation fault (core dumped). This is the how i'm running the sample "./ccoder.exe sample.wav sample2.wav". I'm very confusing about the input and the output file. What is the correct type file for input and the output. Thank you for any respond