1. Open the editing software, import the selfie video, close the video soundtrack, and click Add Audio to import a music clip.
2. Select the audio bar, click Step, turn on automatic step, move the playback pointer to the sixth yellow point, select the video, divide the video, then change the speed of the second half of the video to 0.3 times, delete the redundant video, select the second half of the video again, click Variable Speed, and turn on the smart frame patch to make the slow motion smoother, and finally save.