How to make slow-motion video on mobile phone?

Then you enter the editing interface of fast and slow playback. Dragging the small white circle to the left is the effect of slow video playback, which can quadruple at the slowest time, and dragging it to the right is the effect of fast video playback. You can set the speed of fast or slow video playback according to your own needs.

After setting the speed of video playback, the sound of video will also change with the speed of video. The sound of the video is very interesting when it is about to be played! Just like the alien voice, you can adjust the volume of the video sound by pressing the volume icon on the right. After setting, you can click the "Save" button in the upper right corner.

There are three image quality options for saving video: quick export, high-definition export and ultra-clear export. If you export quickly, the video quality will be slightly worse, the export speed will be faster, and the export speed of HD and ultra-clear will be slightly slower. So choose the image quality you want and export it.