OK that it. Flash is out of here!
QMPlay2
It can be built in qt4 or qt5. AUR is qt4.
QMPlay2 supports most formats of movies, music and subtitles
QMPlay2 supports video playback and Internet streams (eg. Youtube, http, rtsp, rtmp, mms, and many others)
Improved support for "youtube-dl"
It does not mention this. But You can install gst/gstreamer to add to Youtube support. I have both youtube-dl and gst/gstreamer.
Even though I'm using aur. Cpu is way lighter then flash video. Ram ok too. Can be any were from 50M to 150M of ram(150M took me like 10 hour)
http://zaps166.sourceforge.net/?app=QMPlay2 or
http://qt-apps.org/content/show.php/QMPlay2?content=153339 His main web page is in Polish.

And for the Web Browser with all the install gst/gstreamer. You can used a userscript called "ViewTube" Have tons of support to common video stream site.
The only reason I will see flash being used by anyone is flash game site. Witch only be used by younger audience.