Frame rate is likely to be 25fps/25Hz - Mac monitor may well be a 60Hz or multiple of. So the jitter may be frame rate conversion of 25/50Hz to 60Hz.
I don't know if you can change the Mac hardware frame rate for playback of these? 25/50/75/100Hz should help if you have those options available to you. My Macbook and ext monitor is locked down to 60Hz, so its not anything that I know how to do. I suspect if these were played through a normal TV they would playback smoothly.
hth
Meridian owner since 1992 Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).
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Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.
Yes they used to but at some point seem to have got corrupted. I can't pinpoint when but they played ok on older Mac operating systems some years ago.
They are all of the mountain gorillas in Rwanda which is why i'd like to keep them. An Apple media guy on their helpline said it appears to be a content problem which stops them playing properly now.
I have tried various "repair "apps to no avail.
Best Philip
Marantz NR1710, 5x Martin Logan Fresco i, BW PV1 sub,, Panasonic TX55GZ950, Sky HD+,Panasonic DP-UB820 Blu-Ray.