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for HTML5 /mobile, is mp4 enough, or also need ogv/webm?
is webm/ogv supported or needed in addition to mp4 for mobile playback?
for jwplayer 2.1.13 plugin in wordpress, is a single mp4 video all that's needed to correctly play on All mobile devices, eg ios/android/ipads?
I'm asking because in other video playback solutions I've seen them require all 3 video formats be available, mp4 + webm + ogv