I noticed a while back already, that nouveau handles 4k video not that well currently. I tried it out with the cactus-4k video from here: http://www.elementaltechnologies.com/resources/4k-test-sequences Nvidia doesn't have any problem playing that video at full speed, but on my kepler nve6 card even full reclocked nouveau only handles this at 45% speed and the PVLD engine is at max load (only around 80% with nvidia)
Created attachment 120787 [details] screenshot of the video also I noticed that the output is total garbage. so I assume something else is fishy here.
Created attachment 120788 [details] debug output of mesa
Created attachment 120789 [details] crash while playing reencoded video I just reencoded this video just to test if special encoding flags would let nouveau play that video, but I got a crash instead
side note: slightly smaller videos (3840x2100) are working much better, so maybe there is only a tiny issue somewhere
fixed in current mesa master
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.