sync offset and jitter values in mpc-hc and mpc-be

[Milardo]

Hi I have an analog capture card and I was wondering what sync offset and jitter values mean when using my card in mpc-hc and mpc-be? I have attached a screenshot.

I read somewhere that the values should be 0 for best results, correct?

Also what's a good video renderer to be using for capture cards?

Also, looking at the screenshot, under the capture card properties, what does the "Output" preview checkboxes for video and audio do? I notice that you can check it and uncheck it and check it with a black square?

What do the v/a buffers do by the way?