You have a few good options.
Module:
You were probably looking for this.
https://marketplace.sitecore.net/en/Modules/Media_Conversion_Tool.aspx
Custom Code
I would convert the code in this article to a script in Sitecore PowerShell Extensions since you can both run the existing report for finding them plus run the conversion. Actually sounds like a nice addition to the Media Library Maintenance module bundled with SPE.
https://adesev.wordpress.com/2014/08/06/convert-file-based-media-to-database-storage/
Update
Couldn't help myself so I decided to try this myself.
I first ran the SPE report to confirm that there were items that were file based.

There is currently one on my system.

Little rough and needs some testing but this should do it for you in SPE.
function Get-MediaItemFileBased {
Get-ChildItem -Path "master:\sitecore\media library" -Recurse |
Where-Object { $_.TemplateID -ne [Sitecore.TemplateIDs]::MediaFolder } |
ForEach-Object {
$mediaItem = New-Object Sitecore.Data.Items.MediaItem $PSItem
if($mediaItem.FileBased) {
$mediaItem
}
}
}
function ConvertTo-MediaItemDatabaseBased {
[CmdletBinding()]
param(
[Parameter(Mandatory=$true, ValueFromPipeline=$true)]
[ValidateNotNullOrEmpty()]
[Sitecore.Data.Items.MediaItem]$MediaItem
)
if($MediaItem -eq $null) { continue }
$filePath = [Sitecore.IO.FileUtil]::MapPath($MediaItem.FilePath)
$fileInfo = Get-Item -Path $filePath
if($fileInfo.Exists) {
$mediaCreator = New-Object Sitecore.Resources.Media.MediaCreator
$mediaItemFullPath = $MediaItem.InnerItem.Paths.Path
$mediaCreatorOptions = New-Object Sitecore.Resources.Media.MediaCreatorOptions
$mediaCreatorOptions.FileBased = $false
$mediaCreatorOptions.Destination = $mediaItemFullPath
$mediaCreatorOptions.KeepExisting = $false
$filename = $mediaItem.Name + "." + $mediaItem.Extension
$mediaCreator.AttachStreamToMediaItem($fileInfo.Open([System.IO.FileMode]::Open), $mediaItemFullPath, $filename, $mediaCreatorOptions)
}
}
Get-MediaItemFileBased | ConvertTo-MediaItemDatabaseBased