this forum has always served me well in the past so here goes...
I am recording a series of lectures which will ultimately end up on the web, and am recording them on a hyperdeck pro. the first set of files (before hyperdeck software upgrade) were coming out at 100Gb (90mins) i need them to be less than 1Gb. Is my only option re-compression after recording? And what should i use? I'm on a PC.
Yes, the Hyperdeck shuttle records at a very high bitrate, so your only option is to re-compress. MPEG Streamclip is a free encoder for Mac and PC that creates H264 files which you can upload. You don't say what resolution or frame rate you're recording at but a rough estimate is that for a 90 minute file at 1280x720 29.97 frames, you're going to need to encode at 1300 kilobits per second.
Here is a tutorial on using MPEG Streamclip to encode: