Adding audio from WAV file to MP4 using JCODEC - java

I'm trying to figure out how to add an audio from an existing WAV file to an existing MP4 file using jcodec. Looked at https://github.com/jcodec/jcodec/issues/187, https://github.com/jcodec/jcodec/issues/164 to get some clues, still cannot figure out how to do it.

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