RoughDraft

0.2

Get-FFMpeg.ps1

function Get-FFMpeg
{
    <#
    .Synopsis
        Gets FFMpeg
    .Description
        Gets FFMpeg, if installed
    .Example
        Get-FFMpeg
    .Link
        Use-FFMpeg
    #>
    [Outputtype([string])]
    param(
    # The path to FFMpeg
    [Parameter(ValueFromPipelineByPropertyName)]
    [string]
    $FFMpegPath
    )

    if ($script:KnownFFMpegPath) {
        return $script:KnownFFMpegPath
    }


    if ($ffMpegPath) {
        $ffMpegAtPath = $ExecutionContext.SessionState.InvokeCommand.GetCommand($ffMpegPath, 'Application')
        if ($ffMpegAtPath) {
            $script:KnownFFMpegPath = $ffMpegAtPath.Source
            return $script:KnownFFMpegPath
        }
    }

    $ffMpegInPath = $ExecutionContext.SessionState.InvokeCommand.GetCommand('ffmpeg', 'Application')
    if ($ffMpegInPath) {
        $script:KnownFFMpegPath = $ffMpegInPath.Source
        return $script:KnownFFMpegPath
    }

    if ($env:ProgramFiles) {
        $ffMpegInProgramFiles =
            $ExecutionContext.SessionState.InvokeCommand.GetCommand((
                Join-Path (Join-Path (Join-Path $env:ProgramFiles ffmpeg) 'bin') 'ffmpeg.exe'
            ), 'Application')

        if ($ffMpegInProgramFiles) {
            $script:KnownFFMpegPath = $ffMpegInProgramFiles.Source
            return $script:KnownFFMpegPath
        }
    }

    throw "Cannot find ffmpeg"
}