QMediaPlayer play youtube (internet) link

[lotin]

Hello,
I am trying to play youtube.
The youtube link I getting from:

youtube-dl -g "https://www.youtube.com/watch?v=U7BvPxZ..."

This will give you a direct link to media, such as:

https://r5---sn-2gb7sn7s.googlevideo.com/videoplayback?........&source=youtube&requiressl=yes&mv=m&mn,gir,clen,lmt,dur

And when I try to play this link by code:

player = new QMediaPlayer;
player->setMedia(QUrl(link));
player->play();

Nothing happens...

I tryed to play this link directly by gstreamer by:

gst-play-1.0  "link"

And this works. So it shouldn't be coused by missing codec.

Thanks everyone for some help.