More often than not I have to extract some audio from a video file:
avconv -i your-video -nv -acodec copy your-audio-output
Please be noted that some video files might have aac/vorbis/other formats, therefore the suffix of the output should be changed correspondingly.
usu. mp4 videos have aac audio, webm videos have vorbis audio (can be stored in ogg files).
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