Sparse Optical Flow in C++ Speed information

Sparse Optical Flow in C++ Speed information

For extracting the speed information using the metavision_sparse_optical_flow I changed some code lines as in the website is said with the function void writeCSV. This function gets the flow_output and writes it down in a csv format. 

I try to run the code from the command prompt using a recording sample as: metavision_sparse_optical_flow.exe -i pedestrians.raw but no file is generated.

I have done the same with the python algorithm and in that case you need to specify that you want to generate this file by: python metavision_sparse_optical_flow.py -i pedestrians.raw --output-sparse-npy-filename all_flow_events.

This does generate the file, so i was wondering if i am missing any instructions to the c++ code so that it can generate the file. 

Thank you
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