Description: Opera crashes when I try to login to some websites

Steps to reproduce: open login.live.com or amazon.com and try to login

Actual result: browser crash

Expected result: I should login and browser shouldn't crash

OS: Windows 10 64-bit

URL: login.live.com and amazon.com

Version of Opera: 47.0.2631.13 (PGO)

So #media-windows-mf-demuxer is enabled by default now?

How to post about a problem in Opera Beta and/or Developer

Description: Twitch showing Media resource not supported.

Steps to reproduce: open any twitch stream on HTML5.

Actual result: http://i.imgur.com/5DuQcRH.png

Expected result: gameplay?

OS: Windows 10 x64

Version of Opera: 45.0.2552.89 (PGO)

Same problem