Powershell script to extract the audio from a downloaded video file (e.g. a Youtube video).

extract_audio.ps1

[CmdletBinding()]
param (
    [Parameter(ValueFromRemainingArguments=$true)]
    $Path
)

# This script extracts the audio content from downloaded videos. It's meant to be run by drag-and-dropping the video
# onto the script. However since you can't do that directly to Powershell scripts, set it up this way:
# 1. Install Powershell
# 2. Make a shortcut to this script on your Desktop (call it what you like)
# 3. Edit the shortcut and change the target to:
#       pwsh.exe -file "C:\path\to\this\powershell_script.ps1"


if ( $Path -eq '') {
  write-host -ForegroundColor Red 'Error, no input file provided'
  pause
  exit
}

$source_file=$Path
if ($source_file.ToLower().EndsWith('.mp4') -or $source_file.ToLower().EndsWith('.avi')) {
  $dest_file = $source_file.substring(0, $source_file.Length - 4) + '.m4a'

} else {
  write-host -ForegroundColor Red "Unsupported file type, sorry"
  pause
  exit	
}

Start-Process -Wait -NoNewWindow -FilePath 'E:\ffmpeg\bin\ffmpeg.exe' -ArgumentList "-i","`"$source_file`"","-vn","-acodec","copy","`"$dest_file`""
write-host -ForegroundColor Green "Output file is: " $dest_file
exit