![]() The last line before the close-brace puts everything together and runs convert.exe with the proper arguments.This is so the actual string values will have double-quotes around them since a command-line utility like yours will most likely require them in order to properly process paths with spaces or other special characters in them. ![]() Note the escaped double-quotes in $InputPath and $OutputPath.BaseName is a property of file objects that contains just the file name - excluding the folder structure and the file extension.The next three lines are used to further build the file path details we'll need to provide proper arguments to convert.exe.In the fifth line, ForEach-Object will take the files sent to it by Get-ChildItem and run the rest of the script block against each of them.The fourth line uses Get-ChildItem to take all files in $MusicFolder, with an extension matching $InputFormat, and forward them along the pipeline.The 'Using Batch Files' page is also quite good. The link for Using Batch Parameters is pretty helpful for doing odd tricks with DOS. From the windows desktop, hit F1 and search for batch. With it, you can convert audio and video files of many formats like MP3, AAC, AC3, FLAC, MP4, MKV, and more. F1 help on windows is surprisingly useful when writing DOS style batch files. The first three lines set variables which we'll use later for constructing file paths. FFmpeg Batch AV Converter is a free and open-source audio conversion software for Windows.This is useful for situations like yours, where we need to pre-assemble the arguments for an external command, and then execute that command with its arguments. Invoke-Expression is used to run commands stored as strings.The grave accent ( `) is an escape character, which tells PowerShell to include the following character in a string as-is instead of processing it as a special character if it would otherwise have functional meaning in PowerShell syntax.$x = 'world' Write-Output 'Hello $x' will output Hello $x.$x = 'world' Write-Output "Hello $x" will output Hello world.However, double-quotes are special because they tell PowerShell to expand variables that are within them. refers to a property or method of a variable - remember, PowerShell works primarily with objects as opposed to simple strings. $_ is a built-in variable PowerShell uses to refer to the current object being processed in a loop.ForEach-Object takes objects in an array and runs a series of commands against each of them.The pipe character ( |} redirects output from one command into another command for further processing, instead of simply displaying the results at the console.A key difference though, as with most PowerShell commands is that dir simply returns strings for console output whereas Get-ChildItem actually returns objects which have methods and properties that can be used when the objects are piped to other commands. Get-ChildItem is PowerShell's equivalent to dir.Anything of the format $ = is a variable assignment. ![]() Here's the general breakdown of the commands and flow: I haven't tested much of the above, primarily because I don't really know what utility you're using in the first place, but it should work in principle. Invoke-Expression "convert.exe -o converted $OutputPath $InputPath" $OutputPath = "`"$MusicFolder\$Filename.$OutputFormat`"" $InputPath = "`"$MusicFolder\$Filename.$InputFormat`"" Get-ChildItem "$MusicFolder\*.$InputFormat" | ![]() If this syntax is incorrect, you'll need to adjust the below script accordingly. reports one png, the original untouched, and a new jpeg one. KevinCox on my linux box after mogrify -format jpeg img.png I have 2 files and file img. Given your original post, I'm guessing the command syntax for your convert utility is something like this. To convert PNGs with transparent background, use the following command: mogrify -format jpg -background black -flatten. The nice thing about PowerShell is that it retains access to regular command-line utilities, while also allowing you to leverage the more advanced scripting functions and commands that come with PowerShell. You might want to try PowerShell for this, instead of batch. ![]()
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