Concatenate MIJIA camera recordings and making a motion video as well

job.ps1

# This script should work with Powershell 7.
# It will take about 25 minutes to finish the whole job.
# You should place the ffmpeg.exe under the same folder.
# Also, create a folder named as 'image' is required.
if (!(Test-Path "ffmpeg.exe")) {
  Write-Output "ffmpeg.exe is NOT FOUND, exiting..."     
  throw "ffmpeg.exe is not found in the current working directory."
}
if (Test-Path "output.mp4") 
{
  Remove-Item "output.mp4"
  Write-Output "Working file: output.mp4 is REMOVED."
}

$workingFileName = "target.txt"
if (Test-Path $workingFileName) 
{
  Remove-Item $workingFileName
  Write-Output "Working file: target.txt is REMOVED."
}

Write-Output "Generating file list..."
Get-ChildItem  -recurse -Filter *.mp4 | Sort-Object LastWriteTime|
Foreach-Object {
    $fullName = $_.FullName
    Write-Output "WRITE: $fullName -> $workingFileName"
    "file $fullName".Replace("\", "\\") | Out-File -Encoding utf8NoBOM -Append $workingFileName
}

Write-Output "Concating video files..."
.\ffmpeg.exe -f concat -safe 0 -i target.txt -c copy -an output_full.mp4 

# WIP: should faster.
Write-Output "Taking screenshots...this may take some time"
Remove-Item image\frame*.jpg
.\ffmpeg -i output_full.mp4 -vf fps=1/48 image\frame%04d.jpg

Write-Output "Making motion videos..."
.\ffmpeg -framerate 60 -i image\frame%04d.jpg -r 60 -y output_motion.mp4

Write-Output "Job finished."