FFmpeg Remove video frames without motion and remove audio track

Remove-SoundAndStillness.ps1

$filename = "A:\Users\kilroy\Remove_lack_of_motion.mp4"

# Use ffprobe to extract the avg_frame_rate
$fpsFraction = ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 "$filename"
$fps = Invoke-Expression "($fpsFraction)"

# Convert fractional fps to a numeric value if necessary
if ($fpsFraction -match "/") {
    $fpsParts = $fpsFraction -split "/"
    $fps = [double]$fpsParts[0] / [double]$fpsParts[1]
}

# Use ffprobe to print detailed information about the input file
ffprobe -v error -show_entries format=duration:stream=index,codec_name,codec_type,width,height,bit_rate -of default=noprint_wrappers=1 "$filename"

$fps = [math]::truncate($fps * 100) / 100 #truncate to 2 decimal places

# Display the fps
Write-Output "Frames per second: $fps"

# create new file without audio and removing frames lacking motion
$sourceFrameRate = $fps
$newFilename = "$(dir $filename | foreach { Join-Path -Path $_.Directory -ChildPath $_.BaseName })_remove_nonmotion_mute_audio.mp4"
ffmpeg.exe -i "$($filename)" -vf "select=gt(scene\,0.0002),setpts=N/($($sourceFrameRate)*TB)" -an "$($newFilename)"


<# -an remove audio #>
<# -vf "select=gt(scene\,0.001),setpts=N/(<framerategoeshere>*TB)"  #>

<# https://superuser.com/questions/984841/ffmpeg-remove-parts-without-motion/1029175#1029175
"The higher the number, the more change between frames is ignored, 
 in quick testing you might need to go as low as 0.00001-0.00005 
 depending on the kind of footage you're dealing with." #>

# https://video.stackexchange.com/questions/20229/ffmpeg-trim-filter-renders-the-same-length-output-as-input-with-trimmed-out-fram/20230#20230
# https://www.videoproc.com/resource/ffmpeg-commands.htm