Converting a WAV file to FLAC with customization. https://superuser.com/a/1145254

Rakefile

namespace :convert do
  # https://superuser.com/a/1145254
  desc %Q{ ›› Convert from WAC to FLAC to 16-bit and 44.1 kHz. }
  task :low_res, [:wav, :flac] do |task, args|
    wav    = args.wav
    flac   = args.flac
    bit_rate = 16
    sample_rate  = 44100    
    sh %{ ffmpeg -i #{wav} -af aformat=s#{bit_rate}:#{sample_rate} #{flac} }
  end
  
  desc %Q{ ›› Convert from WAC to FLAC to 32-bit and 176,000 kHz. }
  task :high_res, [:wav, :flac] do |task, args|
    wav    = args.wav
    flac   = args.flac
    bit_rate = 32
    sample_rate  = 176000
    sh %{ ffmpeg -i #{wav} -af aformat=s#{bit_rate}:#{sample_rate} #{flac} }
  end  
end