How can ffmpeg be used to transform an mp4 file into an mp3 file?

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FFmpeg can be used to transform an mp4 file into an mp3 file by using the following command:

ffmpeg -i input.mp4 -vn -acodec libmp3lame -ab 256k output.mp3

Explanation of the command: - -i input.mp4: Specifies the input file name as "input.mp4". - -vn: Disables video recording, which means FFmpeg will only handle the audio stream. - -acodec libmp3lame: The audio codec used for the output file is mp3lame. - -ab 256k: The audio bitrate is set to 256 kbps. You can adjust this value as per your requirement. - output.mp3: Specifies the output file name as "output.mp3".

This command will create a new mp3 file with the same audio track as the original mp4 video file.