[sheng]

Why not webm?

[astrodust]

WebM is a dead format. Although it purports to be patent free, it has very little support and may have exactly the same problems as H.264 with respect to patents.

It earns a "nice try" from Google, but not a passing grade. It's no PNG.

[acdha]

You might find the lengthy discussion in the linked article answers your question.

To summarize: 1. Millions of visitors can't view WebM 2. Most of the video created today is H.264

[sheng]

thanks for the tl;dr summary, I may give the full discussion a try.