Powershell script to transform a compilation of security camera videos into a timelapse with a few caviats - (1) extract a few frames from each security cam video (2) add a small label with a timestamp to each selected frame (3) rename the files sequentially (4) build a final video

gistfile1.txt

param(
    [string]$SourceFolder,
    [string]$OutputFolder
)

# Ensure output folder exists
if (-not (Test-Path -Path $OutputFolder)) {
    New-Item -ItemType Directory -Path $OutputFolder
}

# Change to the source directory
Set-Location $SourceFolder

# Script 1: Extract frames from MP4 files
$mp4Files = Get-ChildItem -Filter *.mp4 -Recurse
foreach ($file in $mp4Files) {
    $subFolderName = Split-Path $file.DirectoryName -Leaf
    $baseName = $subFolderName + "_" + $file.BaseName
    ffmpeg -ss 00:00:00 -i $file.FullName -vframes 1 -q:v 31 "$OutputFolder\$($baseName).00.jpg"
    ffmpeg -ss 00:00:02 -i $file.FullName -vframes 1 -q:v 31 "$OutputFolder\$($baseName).02.jpg"
}

# Script 2: Reformat JPEG filenames
$jpgFiles = Get-ChildItem -Path $OutputFolder -Filter *.jpg
foreach ($file in $jpgFiles) {
    $fileName = $file.BaseName
    $parts = $fileName -split '_'
    $datePart = $parts[0] -replace '(\d{2})-(\d{2})-(\d{2})', 'Jan-$3'
    $timePart = $parts[1] -replace '(\d{2})-(\d{2})-(\d{2})', '$1-$2-$3'
    $newName = $datePart + '_' + $timePart + '_' + $parts[2..($parts.Count - 1)] -join '_'
    Rename-Item $file.FullName "$OutputFolder\$newName.jpg"
}

# Script 3: Rename files sequentially
$counter = 1
$jpgFiles = Get-ChildItem -Path $OutputFolder -Filter *.jpg
foreach ($file in $jpgFiles) {
    $newFileName = "image_{0:D4}.jpg" -f $counter
    Rename-Item $file.FullName "$OutputFolder\$newFileName"
    $counter++
}

# Script 4: Create timelapse video
Set-Location $OutputFolder
ffmpeg -framerate 15 -i image_%04d.jpg -c:v libx264 -crf 17 -pix_fmt yuv420p my-timelapse15.mp4