Ve Firefoxu na Ubuntu mi to hraje bez problemu... Stahuje te videa s reportovanym content-type "video/mp4".
V about:plugins vidim mj.:
OpenH264 Video Codec provided by Cisco Systems, Inc.,
VLC Multimedia Plugin (compatible Videos 3.10.1) ( File: libtotem-cone-plugin.so)
DivX® Web Player ( File: libtotem-mully-plugin.so)
Windows Media Player Plug-in 10 (compatible; Videos) ( File: libtotem-gmp-plugin.so)
A pluginy gstreameru: (aptitude search gst | grep ^i)
bluez-gstreamer gir1.2-gst-plugins-base-0.10 gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-0.10 gir1.2-gstreamer-1.0 gstreamer0.10-alsa gstreamer0.10-fluendo-mp3 gstreamer0.10-gconf gstreamer0.10-libde265 gstreamer0.10-nice gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multi gstreamer0.10-plugins-base gstreamer0.10-plugins-base-apps gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly gstreamer0.10-pulseaudio gstreamer0.10-tools gstreamer0.10-x gstreamer1.0-alsa gstreamer1.0-clutter gstreamer1.0-doc gstreamer1.0-fluendo-mp3 gstreamer1.0-libav gstreamer1.0-libde265 gstreamer1.0-nice gstreamer1.0-plugins-bad gstreamer1.0-plugins-bad-faad gstreamer1.0-plugins-bad-videop gstreamer1.0-plugins-base gstreamer1.0-plugins-base-apps gstreamer1.0-plugins-base-doc gstreamer1.0-plugins-good gstreamer1.0-plugins-ugly gstreamer1.0-pulseaudio gstreamer1.0-tools gstreamer1.0-x libclutter-gst-2.0-0 libgstreamer-plugins-bad0.10-0 libgstreamer-plugins-bad1.0-0 libgstreamer-plugins-bad1.0-dev libgstreamer-plugins-base0.10-0 libgstreamer-plugins-base0.10-0 libgstreamer-plugins-base0.10-d libgstreamer-plugins-base1.0-0 libgstreamer-plugins-base1.0-0: libgstreamer-plugins-base1.0-de libgstreamer-plugins-good1.0-0 libgstreamer-plugins-good1.0-de libgstreamer0.10-0 libgstreamer0.10-0:i386 libgstreamer0.10-dev libgstreamer1.0-0 libgstreamer1.0-0:i386 libgstreamer1.0-dev libqgsttools-p1 libreoffice-avmedia-backend-gst phonon-backend-gstreamer phonon-backend-gstreamer-common phonon-backend-gstreamer1.0 python-gst0.10
Osobně jsem za HTML5 přehrávání rád, jede (obecně) mnohem lépe než Flash (až na výjimky, kdy je to opačně).
Nicméně u implementace pro ČT asi nějaký problém, protože jsem si to zkusil a po pár minutách přesně to samé co píšete a video znovu načíst nejde ani po reloadu stránky. Ale třeba jsme jen zahltili dodavatele služby - O2 (který to dostal bez výběrovky :-) ), když vyšla zprávička tady na Rootu :-D