This application is for changing background music of a video and add any audio to a audio less video. If the audio's length is not same as video's duration then it will be automatically trim/concatenated the audio to video's length. Easy sharing with friends and family on any social networking. How To Use? - Select Video file that you want to change audio. - Select Audio file that you want to add as video background music. - Save the final merged video in to Sd card.</br></br></br></br></br></br></br>