You can do do `file /path/to/file` to see what it really is. file's man page is pretty useful as well.

On Tue, Aug 21, 2012 at 12:24 AM, Michael Havens <bmike1@gmail.com> wrote:
well, I figured out that with youtube-dl you need to know the format of the video to extract the audio (I suppose that means it actually is for ffmpeg). How does one figure out the format of the original file if it isn't listed in the file extension?
:-)~MIKE~(-:

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