ix Get-Frame.ps1 parameter forwarding to use preference variable splatting instead of manual array building, preventing positional binding issues, update Get-FramesRange.ps1 to add -y flag for automatic overwrite of existing PNG files, fix Create-ShortClip.ps1 to skip clearing default Frames directory when -Render is used (frames are input not output) and add null checks before Test-Path in cleanup logic, and update documentation in Create-FullSubtitle.ps1 and Create-ShortClip.ps1 to clarify existing

Create-ShortClip.ps1

@@ -25,6 +25,10 @@
 .DESCRIPTION
     Creates a short clip video file from a 16:9 video file using the specified plan.
     See Create-ShortClip.ini for details about the INI format and supported entries for the plan file.
+    Existing files: with the default -Images (the 'Frames' folder next to the video), files directly in that folder are
+    deleted before extraction (not with -Render, where they are the input). With an explicit -Images, existing frames matching that pattern are deleted before extraction,
+    and the Frames folder is not touched. An existing output video is overwritten. The temporary extraction directory is
+    always removed. The Frames folder is removed after the video is created unless -Keep is given.
     Supports -WhatIf and -Confirm for safe execution.
 #>
 [CmdletBinding(SupportsShouldProcess)]
@@ -498,7 +502,7 @@ try {
         if ($videoDir -eq '') { $videoDir = '.' }
         $framesDir = Join-Path $videoDir 'Frames'
         if (Test-Path $framesDir) {
-            if ($PSCmdlet.ShouldProcess($framesDir, 'Clear existing frames directory')) {
+            if (-not $Render -and $PSCmdlet.ShouldProcess($framesDir, 'Clear existing frames directory')) {
                 Get-ChildItem -Path $framesDir -File | Remove-Item -Force
             }
         }
@@ -719,11 +723,11 @@ try {
     }
     
     # Clean up frames directory after video is successfully created
-    if ((-not $Keep) -and (Test-Path $framesDir) -and ($PSCmdlet.ShouldProcess($framesDir, 'Remove frames directory'))) {
+    if ((-not $Keep) -and $framesDir -and (Test-Path $framesDir) -and ($PSCmdlet.ShouldProcess($framesDir, 'Remove frames directory'))) {
         Remove-Item -Path $framesDir -Recurse -Force
         Write-Host "Frames directory removed: $framesDir"
     }
-    elseif ($Keep -and (Test-Path $framesDir)) {
+    elseif ($Keep -and $framesDir -and (Test-Path $framesDir)) {
         Write-Host "Frames directory preserved: $framesDir"
     }
 }