Function open_muxer_with 

pub fn open_muxer_with(
    output: Box<dyn WriteSeek>,
    streams: &[StreamInfo],
    opts: WavMuxOptions,
) -> Result<Box<dyn Muxer>>

Open the WAV muxer with caller-controlled WAVEFORMATEXTENSIBLE options. Identical to open_muxer when opts == WavMuxOptions::default().