For weaker hardware or decent hardware but desire for real 24 FPS web-embedded videos I suggest
minitube-ubuntu, resoned below. Minitube can play videos from Youtube without using
Flash and having
Graphics User Interface, that is better decoding performance or less system resources taken for the action. I have also noticed difference in FPS (= no screen tearing or slideshow) while Flash was showing FALSE 0 dropped frames... The only problem I found is no Youtube account support, however subscribe works fine.
You can get
gstreamer package or workaround may be needed:
sudo ln -s /usr/lib/kde4/plugins/phonon_backend /usr/lib/qt4/plugins/phonon_backend
Other issues fixes: http://flavio.tordini.org/minitube/faq
For videos not hosted on Youtube there is
youtube-dl supporting variety of sites. But without
GUI, command termianl program.
CPU 2x 1700 MHz
APU AMD E2-1800 driven by fglrx-updates, VESA
Flash v184.108.40.206 /opt/google/chrome/PepperFlash/libpepflashplayer.so
HTML5 video 480p taking 70% CPU and false 24 FPS (I think Flash renders OK but Chrome FPS is lower and my eyes are not satisfied while screen is tearing)
minitube-ubuntu 1080p taking 70% CPU and true 24 FPS