Flash cs4 makes snow effect

Preparation: snow scene pictures and snow videos.
1. Open Flash and create a new FLA file.
2. Import images: Choose File> Import> import to database from the menu to import images to the database.
3. Import a video: Choose File> Import> import from the menu to open the import video panel. Select file path: click browse and find the video file in the open panel, click open. On the import video panel, select: embed FLV in SWF and play it in the timeline. Click next to embed the video. Click next to import the video frequently. Click finish. As shown in the following figure:

4. Choose Insert> new component from the menu and enter snowflake in the name. Type: video editing. Click OK. Enter the editing status of the video clip, select 1st frames, open the library panel, drag the video into the stage, a prompt will appear: This video requires 240 frames to display the entire length. The selected timeline span is not long enough. Do you want to automatically insert the number of frames in the timeline span? Select: Yes. In this way, the snowflake animation is ready.
5. Create a video editing component named interface. Rename layer 1 as the background. Select the 1st frame of Layer 1, open the library panel, drag the image to the stage, adjust the image size in the attribute panel, then open the alignment panel, align left, align up, lock. Add a layer named Snowflake. Select 1st frames and drag the snowflake video clip to the stage. Align left and top. At this time, the snowflake video may be different from the background. Select any deformation tool, click the snowflake layer, hold down the Alt key, and drag the handle to adjust it to the same size as the background.
6. Return to Scenario 1, select the 1st frame of Layer 1, drag the video clip from the library to the stage, align left, and align top. So far, all of them have been completed. Press Ctrl + Enter to test the video.