A 24 fps film does not divide evenly into a 60Hz refresh. Repeating some frames longer than others can introduce an uneven cadence, often visible in slow pans. Source judder, display response and motion settings can also contribute, so first identify the actual frame rate and output.
Recognise cadence rather than buffering
Cadence judder usually looks like a repeating uneven step while the film keeps playing. Buffering more often interrupts playback with a pause or spinner. Do not assume a faster connection will fix a regular motion pattern that remains identical every time the same scene is replayed.
Try supported frame-rate matching
If both the app and device support matching the video frame rate, enable it for a controlled comparison. The television may briefly go black while the HDMI mode changes. A 24Hz-compatible output or an appropriate multiple can avoid uneven repetition, but the exact choices depend on the equipment.
Keep film motion in perspective
Film captured at 24 fps still contains limited temporal detail even when displayed with perfect cadence. Motion interpolation can make it smoother, but that alters the presentation and can create new artefacts. Choose the balance you prefer without mistaking every visible film-motion step for a playback malfunction.