Maximum PC

I download youtube videos (from one specific youtube channel) on a daily basis and copy the .flv files into my android phone and view it at my leisure time (In train,bus and daily travel)
The downloaded files are so easier to handle as they don't hang up like viewing online. Also I don't have data connection on my android device.
I see lot of youtube downloader softwares but they are all manually operated. You have to copy the URL and paste into the downloader in order to download the video. I download 20 .flv files everyday (from one specific channel) and it takes too much time and energy.
I am looking for a software to download the videos uploaded on a specific channel in youtube. I want to run the software as a service on my machine and it should download the newly uploaded videos into my local harddrive (.flv or .mp4 files) by checking the youtube channel every 15 or 30 mins.
Please recommend a software like that

I'd check once a day. A simple script/macro should be able to handle this, but I am not experienced enough to show you exactly what to do.