Bug #22968: Hoster: youtube.com - Free
Hoster: youtube.com - Free | Selecting preferred format for YouTube
An older version of the YouTube interface (before they supported wide screen) asked the user to select between best resolution, medium resolution, or resolution for mobile devices.
I recommend that a Host Setting be added to JDownloader for YouTube that contains a drop down box:
What is your preferred format?
Highest video quality with audio
Highest wide screen video quality with audio
Medium video quality (slow connection) with audio
MP4 video (for mobile devices) with audio
Audio only, high quality
Audio only, MP3