The Lighting Controller

I am trying to record a video file MP 4 in the timeline.
but unfortunately I do not see and hear anything. does anyone have a tip for me?

I suppose you mean "play" (as in the title). Does it play fine with other media players like VLC?
Let us know the codec used. If you don't know, try "mediainfo", it will tell you everything:
https://mediaarea.net/fr/MediaInfo
I'ts free, of course