ffmpeg implemented

scripts/download-ffmpeg.ps1

@@ -0,0 +1,71 @@
+param(
+  [string]$Url = "https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip",
+  [string]$OutDir = "tools/ffmpeg/bin",
+  [switch]$DryRun
+)
+
+$ErrorActionPreference = "Stop"
+
+$isWindows = $env:OS -eq 'Windows_NT'
+if (-not $isWindows) {
+  Write-Host "This script is intended for Windows (ffmpeg.exe)." -ForegroundColor Yellow
+  exit 1
+}
+
+$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path
+$outDirAbs = (Resolve-Path (Join-Path $repoRoot $OutDir) -ErrorAction SilentlyContinue)
+if (-not $outDirAbs) {
+  $outDirAbs = Join-Path $repoRoot $OutDir
+  New-Item -ItemType Directory -Force -Path $outDirAbs | Out-Null
+} else {
+  $outDirAbs = $outDirAbs.Path
+}
+
+$ffmpegDest = Join-Path $outDirAbs "ffmpeg.exe"
+
+# If already present, do nothing.
+if (Test-Path $ffmpegDest) {
+  Write-Host "FFmpeg already present: $ffmpegDest"
+  exit 0
+}
+
+if ($DryRun) {
+  Write-Host "Dry run:" -ForegroundColor Cyan
+  Write-Host "  Would download: $Url"
+  Write-Host "  Would install to: $ffmpegDest"
+  exit 0
+}
+
+Write-Host "About to download a prebuilt FFmpeg package:" -ForegroundColor Cyan
+Write-Host "  $Url"
+Write-Host "You are responsible for reviewing the FFmpeg license/compliance for your use case." -ForegroundColor Yellow
+
+$tempRoot = Join-Path $env:TEMP ("radioplayer-ffmpeg-" + [guid]::NewGuid().ToString("N"))
+$zipPath = Join-Path $tempRoot "ffmpeg.zip"
+$extractDir = Join-Path $tempRoot "extract"
+
+New-Item -ItemType Directory -Force -Path $tempRoot | Out-Null
+New-Item -ItemType Directory -Force -Path $extractDir | Out-Null
+
+try {
+  Write-Host "Downloading..." -ForegroundColor Cyan
+  Invoke-WebRequest -Uri $Url -OutFile $zipPath -UseBasicParsing
+
+  Write-Host "Extracting..." -ForegroundColor Cyan
+  Expand-Archive -Path $zipPath -DestinationPath $extractDir -Force
+
+  $candidate = Get-ChildItem -Path $extractDir -Recurse -Filter "ffmpeg.exe" | Where-Object {
+    $_.FullName -match "\\bin\\ffmpeg\.exe$"
+  } | Select-Object -First 1
+
+  if (-not $candidate) {
+    throw "Could not find ffmpeg.exe under extracted content. The archive layout may have changed."
+  }
+
+  Copy-Item -Force -Path $candidate.FullName -Destination $ffmpegDest
+
+  Write-Host "Installed FFmpeg to: $ffmpegDest" -ForegroundColor Green
+  Write-Host "Next: run 'node tools/copy-ffmpeg.js' (or 'npm run dev:native' / 'npm run build') to bundle it into src-tauri/resources/." -ForegroundColor Green
+} finally {
+  try { Remove-Item -Recurse -Force -Path $tempRoot -ErrorAction SilentlyContinue } catch {}
+}