Problem generating Histo or Diff raw files

Problem generating Histo or Diff raw files

Hello, 
I am running "event frame gpu loading sample" by following the exact instructions given: 

First, compile the sample as described in this tutorial.

Then, you can use the metavision_event_frame_generation sample to generate event frame RAW files in Histo3D or Diff3D format.

Now, to start the sample on your event frame RAW file, run: metavision_event_frame_gpu_loading.exe -i event_frame_file.raw -o /. 

I compiled the sample but when it comes to use the metavision_event_frame_generation_sample, i am only able to visualize the histo or diff but not able to save it. The options that appear are the following: 



The --histo or --diff do display the wanted, but i am not managing to save it. What is the way to save this file in the required format to run then the event frame gpu loading sample?
I have also tried with a standard .raw recording provided but it does not work.
Thank you!
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