Video is not playing in some sites
Videos in the below mentioned page is not at all playing only in Vivaldi http://campus.codeschool.com/courses/shaping-up-with-angular-js/intro I'm using Vivaldi browser in Windows XP 32 bit.
Works perfectly here. Window 8.1 x64 Vivaldi x86. I'm using the HTML5 player.
Works fine here as well, on Win7-64 with 32-bit Vivaldi (1.0.352.3, installed stand-alone) and via the HTML5 player.
Works on Windows 10x64 with 1.0.352.3 32bit Snapshot
may be you are missing some video/audio codecs?
Try to install K-Lite-Codec pack for Win XP.