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Reference:
Menus: Video (3)
Play/Pause (Cmd-G)
Plays or pauses the video or the live camera display.

Play Selection (Shift-Cmd-G)
When this is checked, the play controls in the window will refer to the current selected video.

Play all Frames (Option-Cmd-G):
If a movie contains more frames per second than the computer on which it is being played can handle, QuickTime skips or drops frames to enable the movie to stay in time. However, if you want to see every frame, choose Play All Frames from the Movie menu. Audio is not played, since it might not be possible for the video and audio to stay synchronized. If you have a slow computer, the movie may play in slow motion. For example, a 10-second movie may take 15 seconds to play if you choose to play all the frames on a computer that is too slow to play the movie at its true frame rate.

Next Frame (Cmd-(Right Arrow))
Advance the playhead to the next frame.

Previous Frame (Cmd-(Left Arrow))
Move the playhead to the previous frame.
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