I’d tried MX Player Pro – but that doesn’t work, or at least with the settings I’ve tried it doesn’t. It plays back smoothly but in slowmo and drops the sound till the video catches up.
There’s three different decoders in MX Player; S/w, H/w, and H/w+. It defaults to H/w+, and on my device at least it was choppy. Switching to H/w fixed it for me (Jim).
Can the nexus be plugged into an external hard drive ?
Yeah. You need a USB OTG (on the go) cable to allow the two to talk, though. Should set you back less than a fiver.
Ordinarily, USB works in a host/client manner; so for example when you plug a hard disk into a PC, the PC acts as host and so is the ‘clever’ side and tells the disk what to do. The tablet and disk are both ‘client’ devices by default, there’s no host, so the OTG cable tells the devices which side is going to take charge.