your using stream copy for the audio codec, which means its trying to output in 
the same audio format as the input… remove the -acodec copy and try again =]

ffmpeg -i <movie-file> -vn audio.wav




> On Feb 27, 2015, at 4:38 PM, [email protected] wrote:
> 
> 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
> 
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