Split album song file into separate tracks with powershell and ffmpeg

SplitSong.ps1

# ReadMe
# How to use
# 1. Put script and ffmpeg.exe into one folder.
# 2. Create file with timestamps.
# 3. Open powershell terminal.
# 4. Execute script: *path\to\script\SplitSong.ps1* *path\to\track* *path\to\file\with\timestamps*
#
# Example timestamps file:
# 00:00 DEVILISH TRIO - As Light Fades (Skeler Remix) 
# 04:02 Juice WRLD - Conversations (Skeler Remix) 
# 
# Example using when album song and chapters in current working directory:
# D:\Script\SplitSong.ps1 '.\Downloaded song.mp3' .\chapters.txt
#
# 
# Use quotes for paths if it contais spaces.
# Script will create folder in current working directory with same name as album track and put there separate tracks.
# 
# Supported format only: [hh:]mm:ss Title
# If title contains '-', script will try to split title and add "artist - title" to metadata.
# 
# Tested with Powershell 7.1.
# If you want run script on Windows Powershell 5.
# Replace 
# Join-Path $pwd $folderName $trackName
# to
# Join-Path (Join-Path $pwd $folderName) $trackName
#
# Also, probably you will have to change execution policy for powershell 5
# Set-ExecutionPolicy RemoteSigned -Scope Process
# This command allow to execute scripts for this powershell session.
# 

param( [Parameter(Mandatory = $true)]  [string]$songPath, [Parameter(Mandatory = $true)] [string]$chaptersFile )

$chapters = @(Get-Content $chaptersFile)
$songfile = Get-ChildItem $songPath
$folderName = $songfile.BaseName.Trim().Split([IO.Path]::GetInvalidFileNameChars()) -join '_'

if ( -not (Test-Path (Join-Path $pwd $folderName)) ) { New-Item (Join-Path $pwd $folderName) -ItemType Directory > $null }

for ($i = 0; $i -lt $chapters.Count; $i++) {
    $startTime, $trackName = $chapters[$i] -split ' ', 2
    $endTime = $trackArtist = ''
    $trackTitle = $trackName = ($trackName.Trim().Split([IO.Path]::GetInvalidFileNameChars()) -join '_') -replace '\$', '`$'
    if ($trackName.Contains('-')) { $trackArtist, $trackTitle = $trackName -split '-', 2 }
    $trackPath = Join-Path $pwd $folderName $trackName

    if (Test-Path  ($trackPath + $songfile.Extension)) {
        $trackName += "`_$i"
        $trackPath = Join-Path $pwd $folderName $trackName
    }

    $trackPath += $songfile.Extension

    if ($i -lt $chapters.Count - 1) {
        $endTime = "-to $(($chapters[$i + 1] -split ' ', 2)[0])"
    }
    $command = "ffmpeg -loglevel error -stats -i `"$($songfile.FullName)`" -c:a copy -ss $startTime $endTime -metadata track=`"$($i + 1)`" -metadata title=`"$($trackTitle.Trim())`" -metadata artist=`"$($trackArtist.Trim())`" `"$trackPath`""
    Write-Host "Extracting: $trackName"
    Invoke-Expression $command
    Write-Host ''

    Start-Sleep -Milliseconds 500
}