[FFmpeg-user] Record multiple channel audio from Focusrite Scarlett 18i8

[Paul B Mahol]

On Wed, Nov 6, 2024 at 2:45 PM Stuart Robinson <Stuart.Robinson at ed.ac.uk>
wrote:

>
> > As in the title I am wondering if it is possible to record all inputs
> from
> > my focusrite to separate mono tracks.
> >
> > ffmpeg -sources dshow
> >
> > just shows
> >
> > [analogue 1 + 2 (audio)]
> >
> > despite the device having 18 inputs (I don't care about the spdif and AES
> > inputs but I would like to have the main input channels)
> >
> > Does anyone know if it is possible to record these channels with ffmpeg?
> > Do I need to make a change to dshow somehow?
> >
> > Thanks, Stuart.
> >
> >
> > --
> > Should I assume this is not possible? Is there a technical issue I am not
> > aware of due to windows sound drivers or is this a limitation of ffmpeg?
> >
>
> >>I have not assumed that you have read dshow source device documentation.
> >>So I will kindly point it to you:
>
> Thanks Paul I had looked over it, but I am not sure I follow where I can
> configure the additional inputs....
>
> -list_options shows different sample rates and depths,
>
> -show_audio_device_dialog doesn't seem to offer any options around the
> channels that I can see.
>
> I have googled but I am not having a lot of success, could you suggest
> which options I should be looking at in particular?
>
>
There are some examples in same link I linked previously, just continue to
read and scroll bellow:

First list devices available for dshow:

ffmpeg -list_devices true -f dshow -i dummy

The when you found device you want to use list that device options:

ffmpeg -list_options true -f dshow -i audio="Name Of device"

After that you can change options values with different cmd line, for more
info look at examples in documentation.

Thanks, Stuart
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