Has anyone used minute-and-second frames? Is it useful?

I used it. It's quite convenient. Mainly used for film reviews. For example, if you have any comments on a certain picture, you can give text feedback, or you can sketch it frame by frame on the video with a brush. The color of the brush can also be adjusted to mark different key points. All amendments can also be generated into documents with one click, which saves a lot of things. When you have urgent work and don't have a computer, you can use the minute-and-second frame applet, which is very easy to use.