Step 1, first install mencoder. For Ubuntu, there is mencoder in the software repository, you can directly enter the following command to install
Sudo apt-get install mencoder
Step 2, type in the command line
mencoder -oac MP3lame -ovc copy -of rawaudio video file -o audio file
where video file Is the path to your video source file, the audio file is the name of the file you want to output. The audio file format extracted by this command is MP3 format.
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