Raptylos,
I was noticing a glitch w/ Oceanic Life, as well. Is it w/ the crab on the brown leaf (around the 15 second mark)? Otherwise the clip plays flawlessly on my i3 530. The file plays fine for me on my desktop and fairly fine (some dropped frames) on the i3 530 w/ cpu decoding.
Planet Earth - Pole to Pole was mostly ok, but when the flock of birds fades to black there are some artifacts prior to the next scene.
Killa Sampla - seemed ok to me. Some artifacts, but I think it's inherent to the clip, as i notice the same artifacts on my desktop system (nvidia gtx275 using Media Player Classic). Mainly noticeable towards the end of the clip in the lower right. I didnt notice any flashing offhand.
Other samples mentioned played fine (Quantum of Solace Trailer and various ref clips)
Tested on both 15.17.7.64.2141 and 15.17.7.64.2202 drivers, both performed identically as far as I could tell.
Also tried increasing the GPU clock from the default 733Mhz to 1066Mhz w/out any noticeable difference, so I reverted to the default (733).
Tested a bunch of 1080p + 720p videos in my library, which all played fine. I'll continue to test and see if i notice any issues.
Here's the debug log for Samsung Oceanic Life:
http://pastebin.com/XuBDYERR
Also, just tried the Samsung clip w/ nightly trunk build w/ dxva enabled and it doesn't play back the clip nearly as well as xbmc (no real surprise i guess), but interestingly the one glitch I notice in XBMC's playback doesn't happen in VLC.