Improve & fix error reporting

[efraimbart]

I'm trying to load http://jewishmusic.fm/wp-content/uploads/secretmusicfolder1/singles/nissim-black-shiah-maisel---hope.mp3 and

1. It's failing
2. The failure is silent, so I'm not even sure why

This is using the flutter example on windows

Any help with this would be great, thanks!