You probably have MSI Afterburner and Rivatuner Statistics Server (RTSS) installed in your system. It took me a while to pinpoint the main cause but apparently there's something about those monitoring apps that interferes with Splash Pro 2 (also splash pro ex) Motion2 smooth playback.
At first I thought it was my Nvidia driver, and then I thought it was my chipset driver, then I thought theres something wrong with my OS, but turns out the culprit was hardware monitoring apps like those two above. Uninstallation may solve your choppy playback issue.