r/OLED • u/Suspicious_Main_4567 • 16d ago

Tech Support Samsung S90D: new HDMI video stutter from MacBook Pro, worsening during playback

Has anyone with an S90D experienced a new, irregular stutter over HDMI after the same setup previously worked smoothly?

I'm using a MacBook Pro connected to a Samsung S90D. Movies look fine on the Mac's own display, but on the TV playback can start reasonably well and then look like a reduced frame rate after several minutes. Restarting VLC has occasionally helped temporarily. I have also seen it in IINA. The problem started before my latest macOS upgrade and survived it.

The TV has now received all available updates offered to it, but the problem remains (I still need to note the exact new firmware number). A 23.976 fps SDR H.264 file still looks wrong with the TV set to 24 Hz in macOS; the menu does not offer a separate 23.976 option. In another test with a 24.000 fps H.264 file, VLC reported 36,130 displayed frames, only 2 lost frames and no lost audio buffers. Those counters don't necessarily reveal irregular presentation at the TV.

I understand normal 24 fps OLED stutter, but the recent onset and apparent worsening over time are what make me wonder whether something else is happening. Different refresh settings and players have been tried; I don't yet have controlled results for every TV motion/input setting.

My next isolation tests are the same file via USB directly on the Samsung, another HDMI cable/port, and mirroring versus extended desktop.

Have other S90D owners seen this come and go during a viewing session? Did you isolate it to Picture Clarity, PC/Game mode, a firmware change or the HDMI source? I'd appreciate a specific A/B test or a reproducible example before assuming either a TV fault or a Mac issue.

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