Windows 10: Video playback stutters - different problems with different players

Hello!

So here's how it looks like with different programs:
VLC - video doesn't seem to stutter, audio stutters (stops momentarily about 2 times per second). Computer restart can solve that sometimes.
W10 Movies and TV app - video freezes for about 1-10 seconds few times in a minute AND audio doesn't stutter at all.
Windows Media Player (which can be found in W10 also) - no problems at all!

I'm forcefully updated to Windows 10 Pro from Windows 7 Pro SP1 on the launch day and used the "don't leave anything" option when doing the update. Which isn't exactly "clean install" but it did feel so in the end. The Windows also automatically found all the video and audio drivers. My wife used the simple update option with her laptop (didn't wipe anything) and all works well on her computer (also with the new Movies and TV app). My computer specs (which are higher but older than hers) should be in my profile.

I'm guessing there's something to do with either the video or audio drivers or codecs. What could be wrong? Where to begin?

:)

 

Nokia Lumia 800 - Micro Stuttering / Lag in OS and also in video playback

I have the same problem with Lumia 900 (unbranded). I thought this is because of the codec in playbacked video (x264), but I have done some tests: used various codecs with different bitrates, recorded own videos using Lumia in 720p and VGA, played them on
it and even uploaded them to Youtube and then played them...

What shocked me is that VGA video stuttering in Lumia's player was NOT stuttering while streaming from Youtube. I mean, WHAT THE HELL?????????

 

Lumia 950 - Can't connect to Miracast devices

I have the same problems with my 950 XL. When connected wirelessly with miracast (screen mirroring) video playback is stuttering on my phone and on the connected Screen - no difference what app I use to play videos (playing locally stored videos, youtube,
zattoo IPTV). If not connected wirelessly they all play smoothly.