Longtail Video's Jeroen Wijering, maker of the popular JW FLV Player and JW Silverlight Player wrote in HTML5 Video: Not Quite There Yet:
- No major media sitepresents HTML5 as their primary viewing optionHTML5-compatible browser penetration is low, and will continue to be well into the future
- Though HTML5 is great for low volume video playback, it lacks many critical features currently available in plug-in based technologies
- Full HTML5 support will require 2 or 3 times the encoding chores of Flash support
- Use HTML5 wherever it's supported, otherwise failover to Flash
- Use Flash unless it's not supported, then failover to HTLM5.