Using the open source video editor Openshot: (Windows)
How to Remove the Audio From a Video
If you want to mute a video or you want to use your video’s audio as an independent file, you can detach the audio from your video in OpenShot:
- Launch OpenShot, click File > Import Files at the top and add your video to the app.
- Right-click your video and select Add to Timeline.
- Hit OK on the following screen as you don’t need to configure any options.
- Right-click your video on the timeline and select Separate Audio > Single Clip (all channels).
- If you want to mute your video, click the audio file on the timeline and hit the Delete key.
- Select File > Export Project > Export Video to save your video without the audio.
How to Add Background Music to a Video
You can add pretty much any music track available on your computer to your video file.
- Click File > Import Files to add both your audio and video files to the app.
- Right-click your video and select Add to Timeline.
- Select Track 5 from the Track dropdown menu and click OK.
- Right-click your music file and select Add to Timeline.
- This time around, choose Track 4 from the Track menu and click OK.
- Click File > Export Project > Export Video to save your musical video.
The idea here is that your music should appear on a different track than your video track.
https://www.makeuseof.com/how-to-edit-videos-on-windows-10/
