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I wanted to use ffmpeg
ffmpeg -i file.cda file.m4a
but I get the error
Invalid data found when processing input
So how can I convert lots of cda files on macOS?
I can't because a .CDA (CD Audio) file is a Windows file, created as a shortcut to a file located on a CD.
The file doesn't contain any Audio data.
I had to rip the CD on my Windows machine, then copy the ripped (located in the Music folder) files onto my Mac.