PowerShell script to run FFmpeg as a local RTMP server, saving recordings to local files. Files saved into date-stamped folders, with incrementing file names. Automatically saves files and starts the server again - ideal for use with BlackMagic Atem Mini to record takes across a network. Uses MKV container file format to minimise risk of corrupt…

rtmp-recording.ps1

# rtmp-recorder.ps1
# Automatically records RTMP streams with NVENC HEVC encoding

$OutputDir = "G:\Video\Recordings"  # Change this to your preferred location
$Port = 1935
$App = "live"
$StreamKey = "stream"

Write-Host "RTMP Recorder Started (NVENC HEVC)" -ForegroundColor Green
Write-Host "Listening on rtmp://0.0.0.0:$Port/$App/$StreamKey" -ForegroundColor Cyan
Write-Host "Press Ctrl+C to stop the recorder completely" -ForegroundColor Yellow
Write-Host ""

while ($true) {
    $dateFolder = Get-Date -Format "yyyy-MM-dd"
    $dayDir = Join-Path $OutputDir $dateFolder
    
    # Create date folder if it doesn't exist
    if (!(Test-Path $dayDir)) {
        New-Item -ItemType Directory -Path $dayDir | Out-Null
        Write-Host "Created folder: $dayDir" -ForegroundColor Magenta
    }
    
    # Find the next available number for today's folder
    $counter = 0
    $existingFiles = Get-ChildItem -Path $dayDir -Filter "*.mkv" -ErrorAction SilentlyContinue
    foreach ($file in $existingFiles) {
        if ($file.BaseName -match '^\d+$') {
            $num = [int]$file.BaseName
            if ($num -ge $counter) {
                $counter = $num + 1
            }
        }
    }
    
    $filename = Join-Path $dayDir ("{0:D3}.mkv" -f $counter)
    
    Write-Host "[$dateFolder/$counter] Waiting for stream..." -ForegroundColor Cyan
    
    ffmpeg -hide_banner -loglevel warning -listen 1 -i "rtmp://0.0.0.0:$Port/$App/$StreamKey" `
        -c:v hevc_nvenc -preset p4 -cq 26 -rc vbr `
        -c:a aac -b:a 128k `
        $filename
    
    # Check if file was created and has content
    if (Test-Path $filename) {
        $size = (Get-Item $filename).Length
        if ($size -gt 0) {
            $sizeMB = [math]::Round($size / 1MB, 2)
            Write-Host "[$dateFolder/$counter] Saved: $filename ($sizeMB MB)" -ForegroundColor Green
        } else {
            Remove-Item $filename -ErrorAction SilentlyContinue
            Write-Host "[$dateFolder/$counter] No data received, removed empty file" -ForegroundColor Yellow
        }
    }
    
    Start-Sleep -Seconds 2
}