Set VLC to use DXVA3 aka D3D11:
Tools -> Preferences -> Video
Output = D3D11
Tools -> Preferences -> Input/Codecs
Hardware accelerated decoding = D3D11 Video Acceleration
Then save, exit and restart VLC.
And if it doesn't work then open Tools -> Messages (set Verbosity to 2) before you start the playback, and then paste the
full resulting log here or on
Pastebin.com if it's too long.
Also please upload a short sample of a problematic file to either
Zippyshare.com (200 MB max) or to
EmbedUpload.com, the latter will upload the file for you to several other hosts (use the default ones) and then post the link to the file here.
If needed cut it with DGsplit and read here about how to do it:
viewtopic.php?f=14&t=57724&p=193335#p193335
50 MB max should be enough.