I'm going to reply to my own post!
You need to create sub-folders to contain your videos for example Comedy, Drama, etc.
If you then wish to have cover art associated with each video, you then need to create a sub folder for each video, each video sub-folder will hold the video plus the 'album cover' image file.
There appears to be a bug if you wish to add a image to the primary sub folder in that it picks up the image from one of the videos in the folder below. This can be manually fixed by a copy and paste/ delete/ move.
What Madsonic doesn't do is attempt to pull movie info from sites like IMDB, this would be a great feature. You can copy and paste this info into a Comment box.
Unfortunately, Madsonic is biased towards audio files

so I'm going to take a look at Envy as an alternative.