This verb is a wrapper for the great FFmpeg application. The command "man ffmpeg" (if you have installed ffmpeg on your computer) will give you many informations. If you do not have ffmpeg on your computer you will find easyly on internet many documentation on this great program.
Example:
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int rc = await flutterSoundHelper.executeFFmpegWithArguments
([
'-loglevel',
'error',
'-y',
'-i',
infile,
'-c:a',
'copy',
outfile,
]); // remux OGG to CAF