Hi Scott,

I'm experiencing some issues with saving SFF files, as some of the SFF files seem to be empty when I read them in Python. There are two ways I have found I can recreate the issue.

First of all, when using SaveData on a spectrogram which does not have a maxFreq value, I get empty spectrograms when reading the SFF file in Python.

C#

(int sampleRate, double[] audio) = WavFile.ReadMono(filename); spec = Spectrogram.Spectrogram(sampleRate, fttSize: 512, sstepSize: 200); spec.Add(audio); spec.SaveData("spectrogram.sff");

Python

sff_spec = sffLib.SpectrogramFile('spectrogram.sff').values

At which point sff_spec is None.

Secondly, I also get the same problem when providing a maxFreq > 7999 in C# when instantiating the spectrogram. Even with setting the maxFreq = 7999, I get some SFF files that still contain no spectrogram data. One such example is this file from the TESS dataset.

Is this a problem with the C# SaveData function or am I doing something wrong saving the SFF files?

Regards,
Kevin