Click to expand.Seems like this depends entirely on the implementation. Using to play YouTube videos via QuickTime (rather than the HTML5 site) allows the aging MacBook 1,1 Ive been using the last few days to play HD videos smoothly. (720p smooth at all times, 1080p smooth fullscreen but not scaled down to fit in the page) Flash on the other hand, struggles with 480p. The video plays smoothly, but the CPU load is higher than playing back 1080p via QuickTime. 720p or 1080p are completely unplayable in Flash. I suppose on old hardware GPU acceleration in Flash is limited. On the OSX plattform there have only been a limited amount of APIs to help enable GPU acceleration.
It even took a while for the new Intel GPUs to get it while Nvidia worked sooner. In my experience on Windows and OSX in various browsers.
Html5 Web Video Player
Flash Player 10.2 and later can also accelerate video presentation on some sites, accelerating all aspects of video playback. If you can see the HTML5 video properly, but can’t see the non-HTML5 video, there may be an issue with Flash Player. From the Apple menu, choose About this Mac. Click More Info. HTML5 Video Player software is the easiest way for you to encode your video to HTML5 video compatible format and embed into your own website with a few mouse clicks.
HTML5 is at least as bad in most cases worse than Flash. It works smooth enough over everything on my 2010 MBP but I don't see the least indication for HTML5 being any better. It is buggy with jumping around in many videos and on a 2010 MBP takes even in Safari just as many CPU power. In Chrome and Opera more. If I could load the VLC streaming engine instead of a default player that would help things. VLC supports streaming and jumping around and always needed less speed for any of it. It is also a non debatable fact that the HTML5 player doesn't hold a candle to the current youtube Flash version in functionality.
Not only is it less buggy you have also more control in skipping around. I don't get it html5 trial on youtube doesn't exist since yesterday.
Html5 Video Player Download Free
Support in browsers is also rather universal (old IE7 is down to some 3%) now. Whatever /Wherever the problem is; it should have been fixed by now. It is only a video player and it is not as if the wheel needs to be reinvented only integrated with the browser.