Be aware that most GPUs and mobile devices don't have hardware decoding of VP9 yet, so it has to be done in software. Because modern PCs have much faster CPUs than mobile devices, a typical modern PC will be able to decode VP9 video just fine while a mobile device will likely choke and turn into a stutter fest (this can also happens on older and lower-end PCs as well).
When it comes to YouTube on mobile, I believe the YouTube app currently defaults to h.264 (I'm not 100% sure on this, so I'm going to check in a bit...)
If you really want to get VP9 playing on mobile, you'll probably have to use a lower resolution like 480p or 360p.
Last edited by Nintendo Maniac 64; 15th February 2015 at 00:06.
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