I just did a backup/install/restore upgrade from 8.2.5 to 9.0.1 and now my mkv rips of HD (1080p) television shows are choppy. I don't have any audio problems, but the video appears to be running a low frame rate. I am running on an Intel NUC with a USB connected Seagate hard drive. I haven't yet captured any debug logs.
Update:
When I turn logging on, it shows a 30fps frame rate and about 30%-60% CPU usage. When I exit out to the video with logging on, I see a displayed frame rate of 60fps. The log file shows several of the following error messages:
CDVDClock::ErrorAdjust - CVideoPlayerAudio::OutputPacket - error:-10076.633064, adjusted:-10076.633064
I don't know if that has anything to do with the strange motion artifact. Perhaps this is a kodi issue.