While there are a lot of applications or web services that can help you download videos from YouTube, many have trouble extracting high-definition clips over 720p in resolution. 
Ummy Video Downloader does not suffer from this limitation, as it allows you to save any YouTube clip on your Mac of resolutions up to 4320p, as well as rip audio tracks and save them as MP3 files.
Easy-to-use OS X app that can help you download videos with very little effort
Using Ummy Video Downloader could not be easier, as you simply need to copy a clip’s YouTube link and bring up the application’s main window. It automatically extracts the URL from the clipboard, so that all you have to do is press the download button.
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