The motion blur and flickering you're experiencing while watching Blu-ray discs on your PS3 or PS4 is related to a video setting on the Playstation itself.
You can resolve this issue easily using the following steps on your Playstation:
- Scroll to 'Settings'
- Select 'Video Settings'
- Scroll through the options until you see '1080P24Hz Output(HDMI)'.
- Select this option and change the setting from 'On' to 'Off'.
Once you have changed these settings, you shouldn't experience any further issues.