If I knew perl I'd send you patches instead of requests , just a couple of quick notes: while I learn perl (or someone else does it) to contribute vdr support, I just added vdr to the list of extensions, and at least I can see my recordings on the tablet.
One minor problem is that names of directories (that's all what matters with vdr recordings) with special characters (áéñ, etc.) are messed up: they apparently are sent in utf-8 but there seems to be no character-encoding header, so the browser defaults to iso8859-1 (if I manually change the encoding to utf-8 everything displays fine).
Another thing is that I have no way to pick the audio track for multilingual recordings (the information on the language on each track is in info.vdr). Additionally it seems that mencoder picked the second language instead of the first one, but I'll have to check more carefully if that's really the case.