diff --git a/Clone-Video.ps1 b/Clone-Video.ps1
index 73a322d..4ec12e9 100644
--- a/Clone-Video.ps1
+++ b/Clone-Video.ps1
@@ -23,10 +23,13 @@
 .PARAMETER Size
     Size of the output video. Uses the input video's size if not specified.
     Possible values: 480p, 720p, 1080p, HD, 1440p, 2K, 2160p, 4K, or custom size in format "width:height".
+    Forces a video re-encode, since scaling requires re-encoding.
 .PARAMETER FPS
     Frames per second for the output video. Uses the input video's FPS if not specified.
+    Forces a video re-encode, since changing frame rate requires re-encoding.
 .PARAMETER NoAudio
     When present, excludes audio from the cloned video.
+    Forces a video re-encode, since removing the audio stream requires re-muxing the output file.
 .PARAMETER Audio
     Path to an alternate audio file to use for the target video. Can be absolute or relative to current directory. When specified, this audio replaces the source video's audio.
 .PARAMETER CRF
@@ -400,7 +403,7 @@ if ($AudioPath) {
     $ffmpegArgs += @('-i', $AudioPath)
 }
 
-$needsReencode = $scaleWidth -gt 0 -or $FPS -gt 0 -or $videoCodecMismatch -or $Reverse
+$needsReencode = $scaleWidth -gt 0 -or $FPS -gt 0 -or $CRF -ge 0 -or $videoCodecMismatch -or $Reverse -or $NoAudio
 
 if ($StartFrame -gt 0 -or $actualEndFrame -lt $maxFrameIndex) {
     $filterParts = @('select=between(n\,{0}\,{1})' -f $StartFrame, $actualEndFrame)