Now, below link provide framework which helpful for display video in any browser, ipad, iphone etc…
Above url provide a simple demo file which will be useful for testing.
But we need to convert our video files into mp4, webm, ogv format.
So at this time we need ffmpeg file which will be convert into above format.
Here, some example of ffmpeg how can we handle
ffmpeg -i <input file name> <output file name>
ffmpeg -i <input file name> -s <size widthxheight> <outputiflename>