8 bit or 10 bit HEVC. How do I know?

I just updated my RPi3 to LibreELEC v8.0.1 MR.

Then tried to play some 1080p HEVC clips that played poorly before the update. There is some improvement but the playback is still jerky.

I suspect the clips might be 10 bit and not 8 bit. But how can I find out?