Hi @babogredac, I read here, that you have Windows 7 version N, and if so, then to be able to play videos encoded with H264 codec, try to install the "Media Feature Pack" for Windows 7 N/KN, and see if this helps.
There is an extension for Opera called Smart video
This improves the buffering of the video in advance. You could even buffer the whole video before playing.
Youtube is to slow with buffering even on a fast internetconnection.