Feature Request NVENC mux external audio file

[Augusto7743]

Thanks for reading my topic.
NVENCC allow mux external file.
FastFlix allowing select external audio file is a good feature.
Have a nice week.
below the nvencc command for use external audio file

--audio-source [:{?}[;=...]/[]...]
Mux an external audio file specified.
file params
format=
Specify input format for the file.

    input_opt=<string>
    Specify input options for the file.

track params
    copy
    Copy audio track.

    codec=<string>
    Encode audio to specified audio codec.

    profile=<string>
    Specify audio codec profile when encoding audio.

    bitrate=<int>
    Specify audio bitrate in kbps.

    samplerate=<int>
    Specify audio sampling rate.

    delay=<int>
    Set audio delay in milli seconds.

    dec_prm=<string>
    Specify params for audio decoder.

    enc_prm=<string>
    Specify params for audio encoder.

    filter=<string>
    Specify filters for audio.

    disposition=<string>
    Specify disposition for audio.

    metadata=<string1>=<string2>
    Specify metadata for audio track.

    bsf=<string>
    Specify bitstream filter for audio track.

Examples

Example1: --audio-source "<audio_file>:copy"
Example2: --audio-source "<audio_file>:codec=aac"
Example3: --audio-source "<audio_file>:1?codec=aac;bitrate=256/2?codec=aac;bitrate=192;metadata=language=jpn;disposition=default,forced"
Example4: --audio-source "hw:1:format=alsa/codec=aac;bitrate=256"