Extension/CropDetect.RoughDraft.ext.ps1
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<# .Synopsis Auto-detect the crop size. .Description Detects silence in an audio stream, using the cropdetect filter. .Link https://ffmpeg.org/ffmpeg-filters.html#cropdetect #> [Runtime.CompilerServices.Extension()] # It's an extension [Management.Automation.Cmdlet("Get","Media")] # that extends Get-Media param( # If set, will find cropping information within a video. [Parameter(Mandatory)] [switch] $CropDetect, # Set higher black value threshold, which can be optionally specified from nothing (0) to everything (255 for 8-bit based formats). # An intensity value greater to the set value is considered non-black. # It defaults to 24. # You can also specify a value between 0.0 and 1.0 which will be scaled depending on the bitdepth of the pixel format. [string] $CropDetectLimit, # The value which the width/height should be divisible by. It defaults to 16. # The offset is automatically adjusted to center the video. Use 2 to get only even dimensions (needed for 4:2:2 video). # 16 is best when encoding to most video codecs. [string] $CropDetectRound, # Set the number of initial frames for which evaluation is skipped. Default is 2. Range is 0 to INT_MAX. [int] $CropDetectSkip, # Set the counter that determines after how many frames cropdetect will reset the previously detected largest video area and # start over to detect the current optimal crop area. Default value is 0. [int] $CropDetectReset ) $filterArgs = @( if ($CropDetectLimit) { "limit=$CropDetectLimit" } if ($CropDetectRound) { "round=$CropDetectRound" } if ($CropDetectSkip) { "slip=$CropDetectSkip" } ) -ne '' -join ":" $filterParam = "cropdetect=$filterArgs" -replace '\=$' $filterName = 'cropdetect' $ffArgs = @( '-i', "`"$ri`"", "-vf", $filterParam, '-f', 'null', '-' ) Use-FFMpeg -FFMpegPath $ffMpegPath -FFMpegArgument $ffArgs | & { param([Parameter(Mandatory,ValueFromPipeline)][string]$line) process { if ($line -like "*_cropdetect_*@*") { $blackDetectLine = $line $lineParts = @($blackDetectLine -replace '\[.+?\]' -split "[ :]" -ne '') $ht = [Ordered]@{ InputPath = "$ri" FilterName = $filterName } $ht.Crop = $lineParts[-4..-1] -join ':' for ($pc = 0 ; $pc -lt $lineParts.Length - 5; $pc+=2) { $ht[$lineParts[$pc]] = $lineParts[$pc + 1] } $frame = $lineParts[1] -as [int] $percentBlack = $lineParts[3] -as [int] $Start = [TimeSpan]::FromSeconds(($ht.t -as [double])) $End = [TimeSpan]::FromSeconds(($ht.t -as [double])) $ht.CropExpression = $ht.Crop -replace '^crop=' [PSCustomObject]$ht if ($theDuration -and $progId) { $perc = $Start.TotalMilliseconds * 100 / $theDuration.TotalMilliseconds Write-Progress "$ri - $filterName" " " -PercentComplete $perc -Id $ProgId } $lastBlackDetectEnd = $BlackEnd Write-Verbose "$_" } } } |