Update 1: FAQs were added at the bottom of this page. PDF version of all these FAQs can be downloaded from this post.
In Galaxy S3 (as well as Galaxy Note 2), Samsung sold us Smart Stay, which prevents the display backlight from turning off while you are looking at the display.
In S4, Samsung moved one step further: when you move your head away, the video being played will be paused. This is what Samsung named as Smart Pause. When you move your head back (stare at the screen), it will resume automatically.
You can enable and disable this feature in Settings–My device–Smart screen–Smart pause. To disable this feature, just un-check it.
Have you tried this feature? What do you think about this feature? Share your experience with other owners in the comment box below.
FAQs on Smart Pause
Q1 : When playing a video, it is often stops by itself.
A : Please check whether Smart pause is turned on.
Path : Setting → My device → Smart screen → Smart pause
If you turn on the Smart pause, video will pause when the device detects that you are facing away from the screen.
Q2 : The Smart pause feature does not seem to function well.
A : Please check the following points.
1. To resume playback the front-camera needs to detect your eyes. Ensure you look at the device front camera
2. If there is strong lighting behind you or if you are using the device in a dark place.
3. When the device is shaken
4. SMART Pause does not function when connected to HDMI or AllShare Cast
5. Are you trying to control SMART Pause using a palm motion?