Most documentaries I’ve been involved with have been mixed in stereo. In fact, whenever I’ve seen docs in surround, I’ve never found it to be pleasing. A documentary rarely has the intention of putting you in the action, which is the whole point of surround sound. Documentaries are usually more like looking at something through a window than being in the middle of it. I find that, aesthetically, good ol’ stereo sound supports this much better.
Anyways, since HDCam only has four audio channels, you couldn’t fit the discrete 5.1, and LtRt is not worthy of the investment in the surround mix. It’s kind of like paying for insane CGI and exporting it as an MPEG-1.
I’d still recommend getting the audio mixed by a pro if at all possible. Stereo sound is actually harder to get just right than surround. You can premix, but having someone go over it with experienced ears and knowledge of standard practices will maximize the impact in festivals. Even on a tight budget, there is a lot that can be improved in a tight timeframe, most of the time.
Try talking to audio postprod facility higher-ups. You’d be surprised how ready some are to support new directors.
IHTH,
JC Boulay
Technical Director
Audio Z
Montreal, Canada
http://www.audioz.com