1, first open the material in AE software, and then pull it to the timeline, and you can see the modified material picture on the operation page of this software.
2. Then add the plug-in of matting material, right-click the page, click "matting" in the pop-up option box, and then click "color range" in the option box on the right.
3. Then click the color of the place where you want to cut the picture with the straw.
4. Then click the straw with "+"in the toolbar.
5. Then you can operate the characters in the dynamic matting material.