Convert FLAC to WMA Lossless

convert_flac2wav2wmal.ps1

# Partly from http://kneppscript.wordpress.com/2011/03/25/encoding-wma-files-using-powershell-and-microsoft-expression-encoder/
# Depends on FLAC for Windows from Xiph; Expression Encoder 4 SP1 from Microsoft

if ([Environment]::Is64BitProcess)   
{
  write-warning 'Launching x86 PowerShell'
  &"$env:windir\syswow64\windowspowershell\v1.0\powershell.exe" -executionpolicy remotesigned -noninteractive -noprofile -file $myinvocation.Mycommand.path 
  exit
}

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Expression.Encoder") | Out-Null

$decoder = ".\flac.exe"
$encoderPreset = [Microsoft.Expression.Encoder.Preset]::FromFile(".\wmalpreset.xml")

Function Generate-WAV ($flacfile) {
  $output = $(GetDisplayName($flacfile)) + ".wav"
  &($decoder) -d $flacfile | Wait-Process;
  Return $output
}
Function Generate-WMAL ($wavfiles) {
  $job = New-Object Microsoft.Expression.Encoder.Job
  
  $wavfiles | Foreach-Object {
    $mediaItem = New-Object Microsoft.Expression.Encoder.MediaItem($_)
    $job.MediaItems.Add($mediaItem)
  }
  $job.CreateSubfolder = $false
  $job.OutputDirectory = Resolve-Path(".\")
  $job.ApplyPreset($encoderPreset)
  
  $onProgress_EventHandler = [ScriptBlock]{
    param ( [PSObject]$Sender,
    [Microsoft.Expression.Encoder.EncodeProgressEventArgs]$e
    )
    
    $activity = "Encoding '{0}'" -f $e.CurrentItem.ActualOutputFileName
    $status = "{0}% Pass {1} of {2}" -f [int]$e.Progress, $e.CurrentPass, $e.TotalPasses
    Write-Progress -Activity $activity -Status $status -PercentComplete ([int]($e.Progress))
  }
  # Register onProgress Event Handler with Encoder Job object
  $job.add_EncodeProgress($onProgress_EventHandler)

  # Start Encoding Job
  $job.Encode()
}
Function GetDisplayName ($file) {
  Return $file.Substring(0, $file.LastIndexOf('.'))
}
Function Convert ($flacfile) {
  Generate-WMAL(Generate-WAV($flacfile))
}

$wavfiles = Get-Item *.flac | Foreach-Object { Generate-WAV($_.name) }
Generate-WMAL($wavfiles)

wmalpreset.xml

<?xml version="1.0" encoding="utf-16"?>
<!--Created with Expression Encoder version 4.0.4276.0-->
<Preset
  Version="4.0">
  <Job />
  <MediaFile>
    <OutputFormat>
      <WindowsMediaOutputFormat>
        <AudioProfile>
          <WmaAudioProfile
            Codec="WmaLossless"
            Channels="2"
            BitsPerSample="16"
            SamplesPerSecond="44100">
            <Bitrate>
              <VariableQualityBitrate
                Quality="100" />
            </Bitrate>
          </WmaAudioProfile>
        </AudioProfile>
      </WindowsMediaOutputFormat>
    </OutputFormat>
  </MediaFile>
</Preset>