Reading features from output file about opensmile HOT 4 OPEN

The command you use generates ARFF files (for use with the Weka toolkit), not CSV files. To get CSV output, you should use -csvoutput instead of -O. You can see this by inspecting https://github.com/audeering/opensmile/blob/master/config/shared/standard_data_output.conf.inc where the command-line parameters are defined.

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Thanks! I did that, and now I got a csv format, but there is only one row of data with the value of "frameTime" being 0.0. I tried it with and without -instname, and on both opensmile.wav and media-interpretation.wav, both with the same result.

Also, some of the features have a number in brackets, either between 0-14 or between 0-25, and I'm not sure what it means.

I read the user guide but I still don't get what I'm doing wrong. Any help would be appreciated.

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It sounds like you would like to extract LLD (framewise low-level descriptor) features instead of functional features. LLD features are extracted for low-level frames so you would get a feature vector for every x ms. Functional features are aggregates computed on top of LLD features and by default, aggregated over the full input length so you end up with a single feature vector. This is what is output by default. If you want to get the LLD output, use -lldcsvoutput instead of -csvoutput.

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Also, some of the features have a number in brackets, either between 0-14 or between 0-25, and I'm not sure what it means.

Those are features that have array values, i.e. more than one value. The number indicates the index.

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