I have some .wmv files that have black borders around and I would like to crop them. Here's a powershell script I got from web that I'm using to crop .mp4 files, which it does just beautifully.

Get-ChildItem .\ -Filter *.mp4| ForEach-Object { $exportPath="..\$($_.Name)" #Know where to cut $results=ffmpeg -ss 10 -i $($_.Name) -vframes 10 -vf "cropdetect=24:16:0" -f null - 2>&1 #Cut if(($results | ? {$_ -match 'crop=\d[0-9]{1,4}:\d[0-9]{1,4}:\d[0-9]{0,4}:\d[0-9]{0,4}'})){ Write-Host "The regular expression was matched, value $($Matches[0])." ffmpeg -i $($_.Name) -crf 18 -vf ($Matches[0]) -c:a copy $exportPath }else{ Write-Host "The regular expression was NOT matched. The line was '$($resultsParsed[0])'" $results | Out-File .\resultsFromCropDetect.txt }
}

Needless to say it produces horrible quality for the .wmv files cropped with it.

So, my question is what set of commands should I use for lossy or even lossless output?

EDIT: @Rotem I used FFprobe,

 Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, fltp, 192 kb/s Stream #0:1: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 1440x1080, 24000 kb/s, 29.97 fps, 29.97 tbr, 1k tbn

I'm using cropdetect because it is really easy to find dimensions and automatically crop the video

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