Convert .mov files into .mp4 files on Windows without re-encoding video

batch.ps

$oldvids = Get-ChildItem -Filter "*.mov" -Recurse
foreach ($oldvid in $oldvids) {
    $newvid = [io.path]::ChangeExtension($oldvid.FullName, '.mp4')
    ffmpeg -i $oldvid.FullName -y -c:v copy -c:a libvo_aacenc -b:a 256k $newvid
}