Hiya,
I've got the same issue...
I've got an open ticket with Swann on a different issue with regards to the WDR behaviour (there will be firmware coming out for the NHD 810,811,815 cameras soon to fix it).
but whilst there I asked about the frame rate issue and this was the response:
They sent me a link to the 'swannview player', which I can't get to run and isn't very practical, so I'll probably just find the setting to deactivate the variable framerate and suck up the quality.
Hope that helps