Add audio to video in real time

[Northern star]

Hellow!

My problem is following - I want to add voice translation from microphone to video stream from internet without loosing original audio and immediatly send mux to internet. Now I'm doing that capturing video from desktop (using S-video on my Video card and S-video on my capture card). Is it possible to avoid digital-analog-digital conversion and send video to some kind of buffer, then after audio streams are mixed, mux video with audio back?

I tried to separate audio and video saving them in different ogg files, and then mux them together back with (if I remember correctly) -slave-input. In fact that worked with progressive audio/video mistiming, so I was not able to fix that with Tools - Track Synhronization.

Please help me!

[Northern star]

I just thought that my question is more suitable for Serving streams/VLC stream-output (sout) forum category. Please help me to move my topic there! How can I do that?