Need a little help from some smart HTML pros. I have a Youtube MP4 video that I am trying to remove "captions" and other videos from, hide controls & instigate "autoplay" after about 4 to 5 seconds. The video works well except for those 4 exceptions. Here is the html code.

<iframe width="1100" height="550" src=""&showinfo=0&autohid=1 &controls=0&amp;start=4" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

New to this html editing...Where am I going wrong?

Thanks Much!