take a twitter m3u8 link and download it properly

Get-TweetVid.ps1

# take a twitter m3u8 link and download it properly
function Get-TweetVid {
    param( [string]$Uri, [string]$OutDir )
    $out_file = (Split-Path $Uri -Leaf).Replace(".m3u8", ".mp4")
    $out_path = Join-Path $OutDir $out_file
    if( -Not (Test-Path $out_path) ){
        mkdir -Path $out_path
    }
    ffmpeg -i $Uri -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 $out_path
}