Video "gets stuck" when loading on roVideoScreen

This isn't the answer to your problem, but worth pointing out. There are two different ways to define your streams and you're sort of mixing them together. There's the stream(s) attribute approach and an older parallel arrays approach. When using the stream attribute, quality should be specified as a boolean attribute of the stream AA, not in a streamQualities array of strings. This is described in more detail in section 3.3 of the Component Reference.

Combining a stream AA containing a URL with a streamQualities array of strings, won't break anything necessarily, but your streamQualities will probably be ignored. What you really want to do is this:

aa_Video.Stream = {
  url: TitleArray.Lookup("streamURL")
  quality: true
}