IS Videoplayer.preparecompleted pointless?

So I assumed Videoplayer.preparecompleted would trigger when the video is prepared. I assumed that meant the video was fully loaded and ready to play front to back with not needing to download anymore. but when using it, it looks like it means all prep was made to get the video player ready to play and can start playing it, but no promises to how much of the video is loaded. If I call video.prepare and wait to play on preparecompleted it video does not play, it shows the first frame and freezes. It works better to just use .play, but then after a few seconds it stops due to needing to load.

All i want is a way to track load progress. I want to be able to know how much of my video from url is loaded, so i know when it is safe to start playing the video with no interruptions.