After analysis, why the mask animation in Flash is effective in the scene test but in the video test, the text is not displayed and only the background is visible. There are several reasons:

1. The color of the text is the same as the background, and the text will not be displayed;

2. The text is out of sync with the frame of the background;

3. If the layer submission is wrong, you can change the background image Transparent, the font becomes brighter;

4. The mask layer and the masked layer are locked and checked. If they are not checked, they can only see the masked things;

6. If the mask layer itself is a video clip and there is animation in it, the mask will be invalid;