I am trying to create
.m4a files to play in my car, which has a USB interface.
Files downloaded from this website work fine as is.
However for example if I remux them using
ffmpeg -i infile.m4a -c copy outfile.m4a
They will no longer play in my car.
ffmpeg version N-54499-g63d7684 Copyright (c) 2000-2013 the FFmpeg developers built on Jul 6 2013 10:35:18 with gcc 4.7.3 (GCC)