Video records for conference mode

Is it possible to configure Janus to get video conference records in one file combined?

Now I receive many video files. One file per participant
I need one file combined as I receive in one-2-one call mode

That’s not something Janus will do for you. Janus will always only record the individual audio and video streams: combining/mixing them into a single audio/video file is up to you using an external application (e.g., using gstreamer or ffmpeg). We wrote such a component for our own needs, but it’s not open source.