GIF to Telegram Video Sticker

gif2tgsticker.ps1

# play with filters and arguments to reduce file size lower than 256KB by yourself

$folder = Get-Item ".\gif"
$outFolder = Get-Item ".\outfolder"

Add-Type -AssemblyName System.Drawing

# Get-ChildItem $folder | Sort-Object Length -Descending | Select-Object -First 3 | ForEach-Object -ThrottleLimit 8 -Parallel {
Get-ChildItem $folder | ForEach-Object -ThrottleLimit 4 -Parallel {
    $outFolder = $using:outFolder # comment out if Parallel disabled

    $img = [System.Drawing.Image]::FromFile($_.FullName)
    $width = $img.Width
    $height = $img.Height
    if ($width -gt $height) {
        $scale = "scale=512:-1"
    } else {
        $scale = "scale=-1:512"
    }

    # -b:v             # bitrate
    # -vf              # video filters
    #   nlmeans=s=10   # denoise level 10 (1~30)
    #   fps=30
    #   setpts=0.5*PTS # 2x speed

    $filters = ""
    ffmpeg -i $_.FullName -vcodec libvpx-vp9 -an -vf "$scale,$filters" -pix_fmt yuva420p -y "$outFolder\$($_.BaseName).webm"
}