Extension/Vignette.rd.ext.ps1
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<# .Synopsis Applies a vignette filter .Description Applies a vignette filter to a video source. .Link https://ffmpeg.org/ffmpeg-filters.html#vignette #> # It's an extension [Runtime.CompilerServices.Extension()] # that extends Edit-Media [Management.Automation.Cmdlet("Edit","Media")] param( [Parameter(Mandatory)] [switch] $Vignette, # Set vignette lens angle expression as a number of radians. # The value is clipped in the [0,PI/2] range. # Default value: "PI/5" [string] $VignetteAngle, # Set vignette center x coordinates expression. By default "w/2", [string] $VignetteCenterX, # Set vignette center Y coordinates expression. By default "w/2", [string] $VignetteCenterY, # Set forward/backward mode. # Available values are: # * ‘forward’ # * The larger the distance from the central point, the darker the image becomes. # * ‘backward’ # * The larger the distance from the central point, the brighter the image becomes. # * This can be used to reverse a vignette effect, though there is no automatic detection to extract the lens angle and other settings (yet). # * It can also be used to create a burning effect. [ValidateSet('forward', 'backward')] [string] $VignetteDirection, # Set evaluation mode for the -VignetteAngle, -VignetteCenterX, -VignetteCenterY expressions # *‘init’ # * Evaluate expressions only once during the filter initialization. # *‘frame’ # * Evaluate expressions for each incoming frame. # * This is way slower than the ‘init’ mode since it requires all the scalers to be re-computed, but it allows advanced dynamic expressions. [ValidateSet('init','frame')] [string] $VignetteEvaluatioMode, # Set dithering to reduce the circular banding effects [switch] $DoNotDitherVignette, # Set vignette aspect. # This setting allows one to adjust the shape of the vignette. # Setting this value to the SAR of the input will make a rectangular vignetting following the dimensions of the video. [string] $VignetteAspectRatio ) $filterArgs =@( if ($VignetteAngle) { "angle=$VignetteAngle" } if ($VignetteCenterX) { "x0=$VignetteCenterX" } if ($VignetteCenterY) { "y0=$VignetteCenterY" } if ($VignetteDirection) { "mode=$VignetteDirection" } if ($VignetteEvaluationMode) { "eval=$VignetteEvaluationMode" } if ($VignetteAspectRatio) { "aspect=$VignetteAspectRatio" } if ($DoNotDitherVignette) { "dither=0" } else { "dither=1" } ) -join ':' "-vf" "vignette=$filterArgs" -replace '=$' |