Powershell to batch convert videos using FFMPEG

## ConvertVideo.ps1

## Requires FFMPEG https://www.ffmpeg.org/download.html

## Batch converts a directory of files to the a given format
## eg
## Given a directory with files:
## vid1.mkv, vid2.mkv, vid3.mkv
## Running the command ConvertVideo.mp4 -filepath %PATHTOFILES% -convertto MP4
## the results would be:
## vid1.mp4, vid2.mp4, vid3.mp4

## Usage:
## ConvertVideo.ps1 -filepath %PATHTOFILES% -convertto %EXT% [-ffmpeglocation %PATHTOFFMPEG%]
## -filepath is the path to the files to be converted, spaces must be quoted, trailing slash must be added
## -convertto is the new extension.  Extension must be supported by ffmpeg https://www.ffmpeg.org/documentation.html
## -ffmpeglocation (optional) is the filepath to ffmpeg.exe.  Default is "c:\program files\ffmpeg\ffmpeg.exe"

## eg:
## ConvertVideo.ps1 -filepath c:\scripts\videos\ -convertto MP4
## ConvertVideo.ps1 -filepath "c:\batch files\videos\" -convertto FLV
## ConvertVideo.ps1 -filepath "c:\batch files\videos\" -convertto FLV -ffmpeglocation "c:\program files\audio files\ffmpeg\ffmpeg.exe"



param(
    [string]$filepath=$(throw "-filepath parameter is required"),
    [string]$convertto=$(throw "-convertto parameter is required"),
    [string]$ffmpeglocation="c:\program files\ffmpeg\ffmpeg.exe"
)


# ---------------------------------------------------------------------------#

$ffmpegInputFile="-i"
$ffmpegCodec="-codec"
$ffmpegCopy="copy"

$listoffiles=get-childitem $filepath | sort lastwritetime

## check location of ffmpeg

if (test-path  $ffmpeglocation)
{
    foreach ($file in $listoffiles)
    {
        ## perform the conversion
        $newname=$file.directoryname+"\"+$file.basename+"."+$convertto
        & $ffmpeglocation $ffmpegInputFile $file.fullname $ffmpegCodec $ffmpegcopy $newname
      }
}
else
{
    throw "ffmpeg.exe not found - https://www.ffmpeg.org/download.html"
}