Have you met the same issue? Some users sugest to set the Safe mode. This happens whether video is playing on Quick Time, Quick Look or Safari, and once it starts, all video playback is affected, in Safari, Quick Time, or Quick Look, whether local or streaming, including in other user accounts. While playing videos, sometimes the video stops, then starts playing a couple of frames in a loop, then goes solid green, while audio continues to play. It's rally so good to use? Most users start to feedback the video playback issue on macOS High Sierra 10.13.2: Apple has now released macOS High Sierra 10.13.2 which is the latest Mac OS system, most mac users have upgraded the mac version and can't wait to try the new system.
