I have an official HDMI adapter for my Note 10.1 and it displays the android desktop perfectly fine, there are side bars but I assume these are due to the resolution of my device not being 1080p. However any circular icons are perfectly circular on the tv so it looks absolutely fine. The issue is that as soon as I play video the aspect ratio is completely screwed! Some films display almost correctly but look a bit stretched vertically, there are never any verticle bars like there are on the device (obviously to display widescreen films) so on the tv the film is displayed full height but not full width..... To make it worse if I use a third party video player like BSPlayer the aspect ratios are even worse! The films are practically playing 4:3.

What is strange is that although on the desktop the output is an exact mirror of the display, when playing video it is a separate output (ie the display on the TV does not match what I see on the device. For instance the overlayed play, pause controls and progress bar never appear on the screen.....

What is going on?

Update

Found something else strange.... If I play a film through google play movies which I have bought from google play the aspect ratio is perfect! However if I play a personal film from my sd card through google play movies it is the same aspect issue as the other apps....

How can it play one film correctly and one completely screwed up? (are they purposefully crippling the video output for personal videos?)