Simple drag the speed handle to the left or right to slow down or speed up the video playback speed. Then tap the Play button to preview the change and optionally adjust video speed again until you are satisfied. Finally touch the Done button at the upper right corner to save the change.
Why slow-motion video is not working?
Slow motion video problem can occur in streaming as well as stored videos on your hard drive, SD card, pen drive etc. The problem usually appears when your PC system configuration is not powerful enough to play high quality videos. Sometimes Windows updates too interfere with default video and sound device settings.