I am using Opera 29.0.1795.47
My problem is similar - the video pauses every 10 - 12 seconds, but the audio continues.
This effect is not limited to videos - it happens even when browsing. There is an irritating hesitation or jerking of the display every 10 seconds.
This does NOT happen with other browsers - it is only with Opera
I have been using this browser for years; and it's my default on all the systems I use - Linux, Windows and MacBook Air (I have not yet tried it on the iPad or iPhone)
My Opera version is up-to-date; and I'm sure the problem lies with Opera, not with any other browsers.
How do we report this to the Opera guys?