[FFmpeg-user] How to export generic audio format

[loeffler at eyetrap.net]

Hello all,

I am using:

ffmpeg -i <movie-file> -acodec: copy -vn "audio.wav"

to extract the audio from a movie. This works sometimes but not always  
because some formats want a different file ending. Is there a generic  
audio file format that will take all formats?

Thanks
Markus