Well, I would suggest to capture EVERYTHING.
With FFmpeg, you can set it up to record in segments of any given lenght.
So that makes it easy to clean up afterwards.
If you do a stream copy, the amount of data won’t be that much.
But, you definitely need to test…
VLC might be a good option, but not sure if it can save ‘same as source’. If not, you need a fast machine to do the transcoding on the fly, and you probably want to go to Prores LE or something.
Bouke
http://www.videotoolshed.com