Restream several audio tracks from SRT to HLS and MPEG-TS streams

[AMP-VTV]

Is your feature request related to a problem? Please describe.

It's not really a problem more like an awesome feature already present in ffmpeg.

Describe the solution you'd like
A clear and concise description of what you want to happen.

I would like to be able to restream a selection or all audio streams from my SRT feeds (without transcoding) to "Publications", like the picture below :

I'm able to achieve this feature with ffmpeg through the "-map" option and stream copy :
ffmpeg [INPUT] .... -map 0:v -c:v copy -map 0:a:0 -map 0:a:1 -map 0:a:2 -map 0:a:3 -c:a copy [OUTPUTS]

Describe alternatives you've considered

I tried to select audio streams only one stream at a time but I'm not able to select another source audio stream than the first one, see my bug report https://github.com/datarhei/restreamer/issues/710#issue-2198083059

Awesome project by the way, many thanks !
Julien