how to add background music on a video using filmora 12

As of my last update in September 2021, Filmora 12 might not have been released yet. However, I can provide you with general instructions on how to add background music to a video using Filmora video editing software. The process may be similar in different versions of Filmora, so you can apply these steps once you have Filmora 12 installed.

1. Open Filmora 12: Launch the Filmora 12 video editing software on your computer.
2. Import Media: Import the video clip and the background music file you want to use into your project. You can do this by clicking on the "Import" button and selecting the files from your computer's storage.
3. Add Video to Timeline: Drag and drop the video clip from the media library to the video timeline. It is the lower section of the editing interface where you can see the video tracks.
4. Add Music to Timeline: Drag and drop the background music file from the media library to the audio timeline. It is usually located above the video timeline.
5. Adjust Music Volume: Click on the music file in the audio timeline to select it. You should see a small volume icon on the clip. You can adjust the volume by dragging the slider left or right to increase or decrease the volume.
6. Trim Music (Optional): If your music file is longer than the video, you may want to trim it to match the video duration. To do this, click on the music clip in the audio timeline, then move the cursor to the end of the clip until the trim icon appears. Click and drag the trim icon to adjust the music clip's length.
7. Fade In and Out (Optional): To make the background music fade in at the beginning or fade out at the end, click on the music clip in the audio timeline. On the left side of the clip, you'll find options for fade in and fade out. Click and drag the slider to adjust the fade duration.
8. Preview and Export: Play the video in the preview window to ensure that the background music is in sync with the video. If everything looks good, proceed to export the video by clicking the "Export" button. Choose the appropriate settings and file format for your video, and then click "Export" to save your video with the background music.

Keep in mind that the user interface might have minor changes in different versions of Filmora, but the basic steps should remain quite similar. If you encounter any issues or need more specific guidance, you can refer to the official Filmora documentation or seek help from their support team.