How to extract dynamic features with OpenCV about opensmile HOT 3 OPEN

You can use the -lldcsvoutput to output LLDs. The -csvoutput option outputs functionals. See also https://github.com/audeering/opensmile/blob/master/config/shared/standard_data_output.conf.inc.

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Got it. Can I extracted lld features in frame size: 60s, step size: 1s? The current lld command extracted features in a 10ms step size.

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While technically you can (you might need to make some changes to the config file), most of the LLD features would not make much sense on such large frames (e.g. FFT windows) because they have been designed to be computed on short audio windows. What you probably want to do instead, is to compute functionals on these larger frames. You can do that by editing https://github.com/audeering/opensmile/blob/master/config/shared/FrameModeFunctionals.conf.inc, changing frameMode to fixed and setting frameSize and frameStep, accordingly. Don't forget to use -csvoutput instead of -lldcsvoutput then.

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