Use a video editor or media converter
Import the video file
Select the audio track or extract audio option
Choose the output format, such as MP3, WAV, or AAC
Save or export the audio file
Use an online audio extractor if needed
Use VLC Media Player to convert and save audio
Use FFmpeg with an audio extraction command
On mobile, use a video-to-audio app
On Windows or Mac, use built-in or third-party editing software