HDV may not be a great format to key, but I’v been able to get good keys with Keylight in AE and Ultra key can get a decent key from almost anything. Your lighting has to be done right though, even greenscren lighting, as much space as you can get between the subject and the screen to reduce spill and good back lighting, maybe the most important, in my opinion. Neoscene is a good intermediate format to key with. Hope this helps, Danny Hays