If YouTube has been slow to respond so far to the technical gremlins in its audio compression (see story earlier), it might be because it’s got legal issues on its mind. Specifically, another heavyweight media firm is suing YouTube for alleged copyright infringement. This time it’s Italian broadcaster Mediaset, which is owned by Italian prime minister Silvio Berlusconi. Mediaset is seeking “at least” 500 million Euros in damages – around $779 million – claiming it’s found more than 325 hours of its footage on YouTube across nearly 5,000 separate clips. Add this to Viacom’s ongoing $1 billion lawsuit against YouTube, and you can see how these problems are starting to stack up for Google’s video-sharing site.