A free program for Android, by AndroTechMania.

The best video and audio editor is here! Video Sound Editor is an application designed for Android devices that offers its users a powerful editor that features video muting, video trimming, audio mixing, audio adding, and more. It supports a variety of video formats such as MP4, WMV, 3GP, AVI, MPG, M4V, MPEG4, MOV, MKV, WEBM, M2V, etc. It’s also guaranteed that the results are of high quality and you can share them with your friends.

Video Sound Editor comes with a simple, clean, and user-friendly interface, which makes the app easy to use. You also do not need to spend a single penny to use the app because it’s completely free to download.