Can't read .wav files about musicmetadata

[nickdesaulniers]

or converted .aac files?

[topaxi]

You actually have to tell ffmpeg to map the metadata from one container to the new one...
$ ffmpeg -map_metadata ~/Downloads/while\ my\ guitar\ piano.mp3:~/Downloads/while\ my\ guitar\ piano.aac -i ~/Downloads/while\ my\ guitar\ piano.mp3 ~/Downloads/while\ my\ guitar\ piano.aac

And as far as I know, .wav files do not contain any metadata? (I might be wrong here...)
But how is this related to this node module?

[nickdesaulniers]

I thought it was related to this module. Thanks for pointing out the ffmpeg flag. I had to use it in this form:
ffmpeg -i input.file1 -map_metadata 0:s:0 output.file2
but it looks like for converting to m4a the flag is actually not even necessary. And with the flag, there is no metadata with the .wav conversion. I'm going to have to come up with something else to support wav files for my application...