I downloaded a BBC documentary and the resulting video had a dark vignette, rendering it almost unwatchable - the YouTube source was fine. Is this some kind of copy protection or a configuration problem?
There must be a configuration problem, because I have downloaded and installed the application, and everything worked smoothly. The problem on your side might be related to configuration settings. Try installing a set of codecs, then re-download the video and let Ummy convert it properly.
Download codecs: http://combined-community-codec-pack.software.informer.com/
