Let me take the latest version 22.4.0 of Tik Tok as an example.
1. I made a demonstration with random vibrato. Not all vibrato videos have progress bars, and very short videos generally have no progress bars. First, we opened Tik Tok's homepage and found a video with a progress bar (as shown in the figure below):
2. Drag the progress bar below, and we can see that the video we are watching is 2 minutes and 2 seconds long, but we can see that it shows a few minutes and a few seconds (as shown below):
3. We can also drag the video progress bar to select the time period we want to watch (as shown in the figure below):