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Need a quick, easy and free way of cleaning up a video’s audio from background noise ? Follow the steps below to remove background audio from videos. First get and install the tools: FFMPEG. SoX – Sound eXchange. Then clean your noise! Split the audio and video streams into 2 seperate files: The VIDEO stream: ffmpeg -i input.mp4 -vcodec copy -an tmpvid.mp4 The AUDIO stream: ffmpeg -i input.mp4 -ac