[Cthulhu_]

Also consider their automatic video encoding / re-encoding / resizing; I think there's services (e.g. Amazon Elastic Transcoder) that can do that for you, but that would require some development time of your own.

Is there a single video format supported by all browsers yet?

[irrational]

Those things are easily done with tools like ffmpeg and mbox. This stuff isn't rocket science. These are all solved problems and the tools are free and open-source. And yes, there are video format that are supported by all browsers.

The number of naysayers that are implying that working with videos is so hard in these comments is shocking to me for such a supposedly technical group of people.