I want to have an audio track added to a video. I want to be able to hear the track when watching a video on a website in Polish and after switching to English, for example. I tried to do it myself, but I don't have enough knowledge how to do it. I have the file of the video and audio tracks already done. What needs to be done is to code it in JS and in HTML. Ew. generating the .mdp file. Please send me offers. Maybe I will illustrate an example of what I mean exactly: https://jsbin.com/gutaras/11/edit?html,output.