Wondershare Video Converter Ultimate for Mac fully supports YouTube. This application includes most features of MPEG Streamclip, apart from its unique features. What's the best MPEG Streamclip for Mac alternative on the market? The answer is Wondershare Video Converter Ultimate for Mac. If you want to download YouTube videos on Mac, you can either use the beta version (not fully tested and only compatible with Mountain Lion), or find a MPEG Streamclip for Mac alternative. However, the stable version of MPEG Streamclip for Mac isn't compatible with YouTube. With it, you're able to convert video to play successfully on your computer or continue editing with third-party video editing software like Final Cut Pro, as well as download video from YouTube, and other streaming sites. MPEG Streamclip is a robust video downloader, converter, and editor.